New Hampshire Sea Grant

The hostile media perception, the tendency for partisans to judge mass media coverage as unfavorable to their own point of view, has been vividly demonstrated but not well explained. This contrast bias is intriguing because it appears to contradict a robust literature on assimilation biases—the tendency to find information more supportive, rather than more opposed, to one's own position. We set out to explore a theoretical basis for the hostile media perception that would reconcile it with assimilation biases. To do so, we exposed partisans from opposing camps on the genetically modified foods issue to identical information presented in either a mass media or a student essay context. Consistent with the hypotheses, partisans saw the information as disagreeably biased in a news story format. In student-essay format, however, the hostile media perception disappeared, and there was some evidence of biased assimilation. In addition, content evaluations based on perceived influence on oneself vs. influence on a broader audience suggested that the hostile media perception may be explained by perceived reach of the information source.

The relationship between Atlantic bluefin tuna (ABFT, Thunnus thynnus ) life history patterns and environmental conditions was investigated by developing a state-dependent model that optimizes energy allocation between growth and energy stores and the decision to spawn. The model successfully recreates growth, age-at-maturity, and seasonal variability in condition for western ABFT that spawn primarily in the Gulf of Mexico. Eastern ABFT spawning in the Mediterranean Sea display a life history trajectory shifted toward earlier maturation and, perhaps, reduced growth — a pattern predicted by the model when mortality was higher, migration distance shorter, and food intake during migration and spawning higher. Simulations highlight the sensitivity of the optimal ABFT life history strategy to variability in net energy intake, particularly during migration and spawning, a poorly understood component of their life cycle. Results also emphasize the importance for optimal life history patterns of the timing of spawning migrations in relation to the phenology and amplitude of seasonal prey availability. This study provides insight into potential mechanisms that underlie observations that are at the heart of current discussions regarding ABFT subpopulation structure and variable life history patterns.

Abstract Analysis of the perceptions of commercial fishermen, marine scientists, and other stakeholders of the Gulf of Maine and Georges Bank ecosystem regarding collaborative fisheries research revealed that the benefits of collaboration have been extensive and that a loss of further research opportunities would be consequential. To date, more than 1,000 individuals have participated in research initiatives dedicated to promoting collaboration between scientists and fishermen. A series of eight public meetings were held in the summer of 2008 to determine from fishermen, scientists, and others how this collaboration has affected them, their communities, and the management of important marine resources. Of the 142 attendees, participation was greatest among fishermen (28%) and scientists (24%). The impact of collaborative fisheries research most frequently cited was an increase in the regional capacity to conduct research, utilizing the knowledge and expertise of fishermen and industry vessels as research platforms. Improvements in communication, relationships, and trust between science, industry, and other stakeholders were also lauded. In addition to the social impacts, the economic benefits included enhanced gear efficiency, new fishery opportunities, and help in sustaining fishing operations in times of more restrictive fisheries management. The most frequently cited potential impact of a loss in future funding were probable limits to the capacity of science and management to address local, emerging, or regulatory priorities. Less funding would result in fewer opportunities for stakeholders to work together, build trust, and network. We conclude that because the demands for stakeholder engagement and scientific information will only increase with the global shift toward ecosystem-based management, programs specifically designed to foster collaboration will play a critical role.

The stocking of western mosquitofish Gambusia affinis for mosquito control negatively impacts native fishes with similar ecological requirements. In this study, a series of laboratory microcosm experiments was used to examine intra and interspecific agonistic behavioral interactions (e.g., chases and nips) between western mosquitofish and northern starhead topminnow Fundulus dispar, northern studfish F. catenatus, blackstripe topminnow F. notatus, and banded killifish F. diaphanous at three fish densities and in the presence/absence of vegetation. Western mosquitofish exhibited more agonistic behaviors than the four topminnow species and caused a change in topminnow behavior in mixed-species microcosms. Mosquitofish were aggressive toward conspecifics, with most of the chases and nips occurring at the highest densities and when vegetation was absent. Topminnows exhibited few agonistic behaviors toward conspecifics, but intraspecific chasing and nipping did occur when exposed to mosquitofish. Agonistic behaviors by topminnows toward mosquitofish occurred infrequently, and mosquitofish initiated almost all of the chases and nips. While all four topminnow species were attacked by mosquitofish, northern starhead topminnow and banded killifish were chased and nipped more frequently than the other topminnow species. These two topminnows exhibited the most behavioral changes and fin damage and one northern starhead topminnow died following mosquitofish attacks. Based on these results, it appears that the stocking of western mosquitofish into primary and connecting waterways could have negative impacts on native topminnow species that occur in these systems.

A new innovative topless shrimp trawl was designed and tested in the flume tank, and at sea to evaluate its potential of reducing finfish bycatch in the pink shrimp fishery in the Gulf of Maine. The trawl design removed the square and the top part of the section after the square (first belly section), to become "topless". A five-day sea trial was carried out using the alternating tow method to compare the topless trawl and a commercial (control) trawl. The target species was the pink shrimp (Pandalus borealis) and the major bycatch species was Atlantic herring (Clupea harengus) that formed 90.6% of all bycatch by weight. Comparative fishing indicated that the topless trawl reduced bycatch of Atlantic herring by an average of 86.6%, and at the same time produced a modest increase of 13.5% in the catch of the pink shrimp. There was some increase in the bycatch of flounders, particularly American plaice and winter flounder, though overall amount of flounder bycatch was less than 3% of the total catch. The reduction of Atlantic herring was most likely due to the fish escaping over the headline where the top panel was removed. The increased bycatch of flounders (and increased catch of shrimp) might have resulted from a wider wingend spread and subtle differences in the footgear between the topless and commercial trawls. The substantial reduction of Atlantic herring, the major bycatch species, without a reduction of the target shrimp species proved the concept of the topless trawl and may have a profound impact on other shrimp trawl fisheries around the world.

The American lawn receives more care, time, and attention from individuals and households than any other natural space (Robbins 2007 Robbins, P. 2007. Lawn people: How grasses, weeds, and chemicals make us who we are. Philadelphia, PA: Temple University Press. [Google Scholar]). Given the ubiquity of turf grass across the American landscape and the importance of associated environmental impacts, a growing body of research exists that investigates lawn care behaviors or the factors that influence them. To extend that research tradition, the project reported here was designed to understand lawn care practices, attitudes, and values in urbanizing New England communities and to elucidate the correlates of environmentally friendly lawn care behavior. Findings can be used to inform the development of successful outreach and education to facilitate meaningful behavioral change. The results indicate that a high level of concern for environmental issues and water quality exists among homeowners, and identify important factors related to willingness to engage in alternative lawn care practices to protect water quality.

Municipalities are key agents in the transition to sustainability, and yet we have poorly developed theories and practices for how to facilitate the use of climate information by local governments in adapting to climate change. Existing research suggests that climate information is more likely to lead to adaptation actions when it is coproduced by researchers and policy makers because doing so increases the likelihood that the content of information is credible, salient, and legitimate. In this study, we explored how the coproduction process facilitated or hindered use of information from two climate adaptation projects in coastal New Hampshire. Based on 17 interviews and document review, we found that, contrary to expectations, highly engaged coproduction of knowledge may not be necessary due, in part, to preexisting trust among New Hampshire coastal municipalities, technical service providers, and researchers. However, we found in small towns with limited capacity, even the best climate knowledge is unlikely to be used without ongoing context-specific implementation assistance. Our research provides both practical recommendations for those actively advancing climate adaptation, as well as contributions to the undertheorized third phase of transdisciplinary research in which knowledge is translated to action.

Citizen science is on the rise, and Extension is poised to support this movement by offering technical assistance to citizen science programs, communities, federal partners, and researchers. The expansion of citizen science provides an opportunity for fostering innovative access to Extension resources and increasing engagement with new audiences. To encourage capitalization on this opportunity, we outline Extension's traditional strengths and connect them to the needs of citizen science programs, offer examples of Extension-based citizen science programs that are working with communities to make natural resource management decisions, and make suggestions for ways in which Extension's technical assistance can be shared with the citizen science community to build new partnerships.

On 2 September and 7 October 2022, we captured post-copulatory pairs of Callinectes sapidus (Blue Crab) in Green Crab traps in Great Bay Estuary, NH. On the first occasion, the 2 crabs included a mature post-ecdysis (12–24 hour) female and a mature male, and the female's shed exoskeleton also remained in the trap. Both seminal receptacles had pink sperm plugs and were turgid with spermatophores, indicative of recent successful insemination. Details of the second capture mirrored the first with the exception that the exuvia was not in the trap. This is the first scientific reporting of Blue Crabs mating in Great Bay Estuary, NH, documenting an ongoing range expansion of a species with the potential to have major ecological and economic impacts.

Great Bay Estuary (GBE), within the rapidly warming Gulf of Maine, has experienced significant ecological shifts this century due to naturalization of invasive species. The range expansion of the American blue crab (Callinectes sapidus) currently underway from the mid-Atlantic northward brings the possibility of similar ecological shifts. This study accounts recent trapping and diet analysis of C. sapidus in GBE. Diet is an important component of understanding how the blue crab range expansion may affect GBE ecosystem functions. Across all sites and trap types, 27 blue crabs were captured. Metagenomic analysis of shotgun sequencing techniques were used on the gut contents of blue crabs captured. Most specimens had > 50% Eukaryote sequences. Overall results of this gut content study confirm a mixed diet indicative of an opportunistic feeder. Using metagenomics to analyze the diet of blue crabs as they establish viable populations in GBE will be a useful tool for predicting how these range expanding organisms are interacting within this important estuarine ecosystem, which will promote sustainable development by informing end users who may be affected by these crabs to help them meet their needs in the present and future. This project falls within Global Goal SDG14: Life Below Water.

Abstract Climate change is increasingly impacting marine fisheries worldwide. Concurrently, scientific interest has grown to understand how these systems can cope and adapt, with research shifting from examining vulnerability to assessing risks to focusing on determining and operationalizing resilience. As fisheries-climate-resilience researchers and practitioners navigating a sea of frameworks, toolkits, strategies, policy goals, and management desires, we take stock to ask: what does resilience mean to us? Drawing on our experiences in the northeast United States, we discuss the challenges and ambiguity we encounter in concepts of social-ecological resilience and explore implications for research and implementation. We bring together perspectives to discuss various approaches to resilience, highlighting shared and unique challenges we face. We outline three key considerations as we move forward in resilience research and practice: (1) the need for greater transparency and reflexivity among researchers regarding how they frame and approach resilience; (2) the value of increasing coordination and communication among fisheries groups working on these topics; and (3) the use of co-developed and co-produced resilience research and strategies. We urge for greater centring of communities in these discussions and to explicitly consider how resilience interacts with equity outcomes.

Coastal communities, including those surrounding the Gulf of Maine, are facing considerable challenges in adapting to increased flood resulting from sea-level rise, and these challenges will remain well past 2050. Over the longer term (decades to centuries), many coastal communities will have to retreat inland away from the coast and toward something new. To date, there appears to be little consideration of how arts and humanities could be leveraged to encourage learning and experimentation to help communities adapt to our changing climate. In this article, we describe an interactive theater model that seeks to address the challenge of bridging scientific knowledge and community conversations on managed retreat and serve as an innovative tool to encourage more productive community conversations about adapting to rising sea levels. The interactive theater workshop consists of two components. The first is a set of short intertwining monologues by three characters (a municipal leader, a climate scientist, and a coastal property owner) who share their thoughts regarding the prospect of managed retreat. Each character provides a glimpse into the attitudes, values, motivations, and fears related to distinct and authentic perspectives on managed retreat. The monologues are followed by a professionally facilitated interactive session during which audience-participants are invited to probe characters’ perspectives and even redirect and replay scenes in new ways to seek more constructive outcomes. The workshop is designed for all session participants to examine their own strengths and weaknesses when engaging others on this subject, to be more prepared to accommodate a range of emotional connections to the subject matter, and to anticipate social dynamics at play. The workshop has now been piloted at four different events. Initial feedback from post-workshop voluntary surveys suggest that the workshop is useful for improving the capacity of resilience professionals to encourage more productive conversations about difficult climate adaptation actions.

Fishing portfolio diversification has been identified as a mechanism to mitigate risk exposure for harvesters operating in wild-capture fisheries. As in financial markets, however, the benefits from diversification in fisheries will be a function of whether individuals adopt active or passive investment strategies. There is a long history of evidence of the superior performance of passive investment strategies in the financial economics literature, but little is known about the relative performance of these two strategies in fisheries. Here we use a case study of an observed and high-profile climate shock in the California Dungeness crab fishery to estimate the impact of a relatively active investment strategy, in the form of an extreme decision to exit the fishery for the season, in response to the shock. We find robust evidence of negative revenue impacts from an active investment strategy in this context.

Ensuring humane slaughter is essential for ethical and high-quality fish production. Ikejime is widely regarded as rapid and quality-preserving, yet its manual application is labour-intensive and anatomy-dependent, limiting scalability. An automated, AI-guided ikejime system could overcome these constraints, but its welfare efficacy is unvalidated. We provide the first neurological evaluation of manual and automated ikejime for rendering rainbow trout ( Oncorhynchus mykiss , ∼0.3–0.5 kg) and hybrid striped bass ( Morone chrysops ♀ × M. saxatilis ♂, ∼1.1–2.1 kg) insensible, using visually evoked responses (VERs) on the electroencephalogram (EEG). Results are compared with manual percussion and asphyxiation, together with exploratory product-quality analyses. Asphyxiation caused prolonged distress lasting up to 13–16 min in both species. In contrast, both ikejime methods rendered all trout irreversibly insensible within 2 min, although neither reliably achieved immediate insensibility. Efficacy declined in bass, with ∼25–43 % of individuals remaining sensible after application. These findings demonstrate that ikejime , whether manual or automated, should be preceded by a stunning step ensuring immediate loss of sensibility. Reduced effectiveness in larger and more robust species underscores the need for species-specific refinements, including optimized spike dimensions and insertion techniques. While exploratory product-quality assessments indicated potential effects of slaughter method and effectiveness on rigor mortis and drip loss, these patterns should be validated in future studies using larger sample sizes and broader replication. Together, these data provide critical evidence to guide the refinement of slaughter methods aiming to enhance fish welfare while ensuring product quality. • First neurophysiological validation of manual and automated ikejime efficacy • Fish size and morphology influence ikejime and percussion efficacy • AI-driven ikejime prototype shows promise for humane fish stunning and killing • Improved fish welfare during slaughter linked to enhanced product quality • Ongoing innovation and validation are key to advancing fish slaughter methods

Anadromous rainbow smelt (Osmerus mordax, [Mitchill 1814]) are found along the northeast Atlantic coastline of North America, with their range now limited to north of Cape Cod, Massachusetts, USA. Although their anadromous life cycles are described broadly, gaps remain regarding how adult rainbow smelt use estuaries post-spawning, including movement behaviors, habitats used, and specific timing of emigration to coastal waters. In spring 2021, we used acoustic telemetry to characterize movements during and after the spawning season of rainbow smelt captured in tributaries to Great Bay, New Hampshire, USA, a large estuarine system near the southern edge of their range. Forty-four adult rainbow smelt (n = 35 male, n = 9 female) were tagged with Innovasea V5 180-kHz transmitters and an array of 22,180 kHz VR2W receivers were deployed throughout Great Bay to detect movements of tagged fish from March to October 2021. Rainbow smelt were detected 14,186 times on acoustic telemetry receivers, with 41 (93%) of the tagged individuals being detected at least once post-tagging. Individuals were detected moving between tributaries, revealing that rainbow smelt can use multiple rivers during the spawning season (March-April). Mark-recapture Cormack-Jolly-Seber models estimated 83% (95% confidence interval 66%-92%) of rainbow smelt survived to the mainstem Piscataqua River, and a minimum of 50% (22 of 44) reached the seaward-most receivers and were presumed to have survived emigration. Most individuals that survived remained in the estuary for multiple weeks (average = 19.47 ± 1.99 standard error days), displaying extended use of estuarine environments. Downstream movements occurred more frequently during ebb tides and upstream movements with flood tides, possibly a mechanism to reduce energy expenditures. Fish emigrated from the estuary by mid-May to the coastal Gulf of Maine. Our results underscore that rainbow smelt need access to a variety of habitats, including multiple tributaries and high-quality estuarine habitat, to complete their life cycle.

Research that informs the New Hampshire Aquaculture industry, which has grown significantly over the past few years, and helps the overall associated watershed community to keep Great Bay Estuary healthy is vital. Specific study of green crabs, Carcinus maenas , and their potential effects on oysters, Crassostrea virginica , is important to gain a better understanding of the impact invasive species may have on these ecologically and economically important bivalves. The aim of this study was to document and understand New Hampshire (NH) oyster growers’ perspectives on the issue of green crab predation of oysters. Through a survey, this study documented a preliminary understanding of farmer perspectives and research needs regarding the population of green crabs in NH waters. More specifically, this survey provided a social science perspective and information on areas of potential research - abundance, distribution, and diet of green crabs - that could be beneficial to the oyster industry. This study fills knowledge gaps, helps improve future research (including how to better engage with end users), and facilitates creating and implementing solutions that benefit the NH oyster aquaculture industry.

ABSTRACT Great Bay Estuary (GBE) is a complex estuarine system at the convergence of seven rivers, ocean and land. The GBE ecosystem supports typical estuarine species but, like many estuaries, has been a target of both invasive and range‐expanding species. The goal of this study was to compare abundance, sex and size distribution of green crabs between oyster farm sites and non‐farmed sites within GBE in 2021 and 2022. Overall catch was higher in 2021 compared to 2022. The highest population of green crabs was estimated to be in the farm area around Cedar Point, and natural/restoration area near Moody Point had the smallest European green crab population. In both years, the majority of green crabs captured (98%) were adult males, and few were juveniles captured. At the last sampling date of 2021 and 2022, most crabs were large (68 ± 0.5 mm and 63 ± 2 mm carapace width, respectively). Shellfish growers, restoration and management teams could use these data in mitigation strategies to sustain industries and enhance GBE health. This information is important for oyster restoration initiatives and oyster growers as they may want to: consider putting traps around their restoration reefs and farms to help reduce green crab infestation/predation in their growing areas; make decisions regarding best management practices and optimal growing locations when applying for permits; and work with management teams with gear improvement, such as floating gear, to reduce green crab intrusion into cages. High‐priority locations for trapping should be areas such as oyster farms, oyster reefs and restoration sites.

Employing a citizen science model of partnerships with recreational and commercial fishers, we collected 5298 fin-clip samples of striped bass Morone saxatilis over a 2-year period and a broad geographic area that encompassed a majority of the species migratory range. Using genetic stock identification with a sequence capture approach, we determined that the Chesapeake Bay was the major contributor (80%-88% proportional contributions) to the mixed coastal M. saxatilis fishery, in all seasons, in US northwest Atlantic waters from coastal southern Maine to the New York Bight. The Hudson River was the only other substantial contributor (10%-18%), and the Roanoke River contributed <2%. These patterns were consistent across years (2018-2019), seasons (spring, summer and fall) and maturity status of the fish. Our findings show the power of an efficient, affordable genomic tool and collaboration with an enthusiastic fishing community to inform management of a recreationally valuable fishery.

It was with great excitement that we planned the combined meetings of Northeast Aquaculture Conference and Exposition (NACE) and the International Conference on Shellfish Restoration (ICSR) with the 33rd Milford Aquaculture Seminar (MAS). Bringing these different but complementary audiences together resulted in a meeting that combined many different aspects of fisheries restoration and aquaculture under one umbrella.Four hundred attendees including government representatives, research scientists, industry, and academia at both the university and vocational high school levels attended this event. The meeting commenced on Wednesday December 12th 2012, with over eighty people attending seven field trips to area aquaculture farms and research facilities. The formal program began on Thursday, December 13th with a plenary session including invited speakers Eric Schwabb, Acting Assistant Secretary for Conservation and Management at NOAA; Sebastian Belle, Executive Director of the Maine Aquaculture Association and Boze Hancock from the Nature Conservancy, who discussed the role of aquaculture in fisheries restoration. John Bullard, the Northeast Regional Administrator of NOAA Fisheries Service, addressed the group during the luncheon the following day. The technical papers and workshops presented were divided into 35 sessions over three days of the meeting and included topics such as the history of aquaculture, aquaculture hatchery innovations, siting and planning issues, risk management, aquaculture business management, ocean acidification, climate change, as well as aquaculture disease issues and potential remedies. Having persons present who have experienced problems and successes, along with those in manufacturing and government responsible for addressing concerns and sharing best practices, was invaluable. Discussions among this cross-section of persons who represent different aspects of aquaculture were as important as the well-presented and interesting formal papers and poster sessions. These discussions were facilitated by the many opportunities presented during the large trade show, reception, breaks, lunches, banquet and lobster bake held throughout the meeting.The importance of and need for aquaculture were made evident by all who were in attendance. We are grateful to the twenty four meeting sponsors and to all those who participated and made this such an important and memorable meeting.While oyster restoration efforts have been under way in the Chesapeake Bay for more than two decades, until recently, varying reporting methods and success criteria made it difficult to determine how much progress had been made. A goal to “Restore native oyster habitat and populations in 20 out of 35 to 40 candidate tributaries by 2025” was set in the 2010 strategy to implement the Chesapeake Bay Protection and Restoration Executive Order (signed by President Obama in 2009). This goal made it a priority for state and federal fishery managers, academics, and scientists working on oyster restoration to collaboratively define a “restored tributary” and a “restored reef” to enable them to track progress. A team of these people, led by NOAA staff, agreed on “oyster metrics” in 2011 (http//preview.tinyurl.com/8kmbdpm) that specify key metrics and target ranges for them, including tributary size, how to determine how much restorable bottom a tributary contains, how much of that restorable bottom needs to be restored, and the minimum oyster density and biomass in that restored bottom to count a tributary as restored. These new metrics enable experts to clearly see how oyster restoration efforts are working and use adaptive management to improve these efforts. These metrics serve as a tool to plan and evaluate oyster restoration consistently across the Chesapeake Bay, and the consensus-based framework used to develop them may have broader application to other restoration activities.In the past, oyster restoration in Maryland was performed primarily

As invasive European green crabs (Carcinus maenas Linnaeus) continue to impact Gulf of Maine ecosystems and fisheries, harvesters and coastal resource managers are exploring strategies to mitigate the effects of this species. One option is to establish and promote a soft-shell crab fishery for this species; however, it can be difficult to accurately and consistently identify premolt crabs for harvest using external morphological cues alone. This study evaluated the application of several hemolymph indices as diagnostic tools for determining the molt stage in C. maenas. Captured crabs were tagged, measured, and held in individual compartments in a floating enclosure for up to 51 days. Hemolymph samples were collected twice per week from individual crabs (n = 126) and evaluated for hemolymph color, total protein (refractive index, RI), and calcium concentration. The resulting data suggest a positive relationship between these metrics: darker hemolymph samples had higher protein and calcium concentrations; crabs with darker hemolymph and higher initial RI were more likely to molt within 3 wk; and initial RI ≥9.5 resulted in a >50% chance of molting within 3 wk. In addition to improving our understanding of the biological underpinnings of molting in brachyuran crabs, these results provide practical information for creating an accessible molt assay tool (i.e., hemolymph color) that can be used by harvesters to further facilitate the development of a soft-shell crab market.