Fisheries Research最新文献

{"title":"Good practices, trade-offs, and precautions for model diagnostics in integrated stock assessments","authors":"","doi":"10.1016/j.fishres.2024.107206","DOIUrl":"10.1016/j.fishres.2024.107206","url":null,"abstract":"<div><div>Carvalho et al. (2021) provided a “cookbook” for implementing contemporary model diagnostics, which included convergence checks, examinations of fits to data, retrospective and hindcasting analyses, likelihood profiling, and model-free validation. However, it remains unclear whether these widely-used diagnostics exhibit consistent behavior in the presence of model misspecification, and whether there are trade-offs in diagnostic performance that the assessment community should consider. This illustrative study uses a statistical catch-at-age simulation framework to compare diagnostic performance across a spectrum of correctly specified and mis-specified assessment models that incorporate compositional, survey, and catch data. Results are used to contextualize how reliably common diagnostic tests perform given the degree and nature of known model issues, including parameter and model process misspecification, and combinations thereof, and trade-offs among model fits, prediction skill, and retrospective bias that analysts must consider as they evaluate diagnostic performance. A surprising number of mis-specified models were able to pass certain diagnostic tests, although there was a trend of more frequent failure with increased mis-specification for most diagnostic tests. Nearly all models that failed multiple tests were mis-specified, indicating the value of examining multiple diagnostics during model evaluation. Diagnostic performance was best (most sensitive) when recruitment variability was low and historical exploitation rates were high, likely due to the induction of better contrast in the data, particularly indices of abundance, under this scenario. These results suggest caution when using standalone diagnostic results as the basis for selecting a “best” assessment model, a set of models to include within an ensemble, or to inform model weighting. The discussion advises stock assessors to consider the interplay across multiple dynamics. Future work should evaluate how the resolution of the production function, quality and quantity of data time series, and exploitation history can influence diagnostic performance.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142444818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Principles for estimating natural mortality rate","authors":"","doi":"10.1016/j.fishres.2024.107195","DOIUrl":"10.1016/j.fishres.2024.107195","url":null,"abstract":"<div><div>In contemporary stock assessments there is increasing emphasis on how natural mortality varies with time, age, and space. But, little guidance is available for estimating this parameter. We maintain that in an exploited population, with few exceptions, contrast in fishing mortality in the data is needed to separate fishing mortality from natural mortality. Variability (contrast) in fishing mortality can be over time (inter- or intra-annual), space, and ontogeny. (The exceptions where contrast in fishing mortality is not needed are cases where information is available on population size and total catch.) High contrast in fishing mortality results in enhanced ability to estimate natural mortality. It follows that study design can be manipulated to achieve greater contrast and make more effective use of existing contrast. Integrated stock assessments afford the opportunity to enhance the needed contrast, provided the contrast is modeled explicitly.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142441548","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Evaluating the contributions and economic costs for Walleye fry and fingerling stocking in a large midwestern reservoir","authors":"","doi":"10.1016/j.fishres.2024.107207","DOIUrl":"10.1016/j.fishres.2024.107207","url":null,"abstract":"<div><div>Stocking is a common management practice to maintain Walleye populations where natural recruitment is low or to introduce and sustain Walleye populations outside of their native range. Walleye can be stocked at multiple lengths (e.g., fry and fingerling) and different sizes of stocked Walleye may contribute differently to Walleye year class strength, depending on the system into which they are stocked. The cost associated with stocking also varies by product. Therefore, it is important to determine the contributions from different stocked products within a region or for an individual waterbody. The objectives of our research were to 1) compare the relative contribution of and total length and body condition at the time of capture at age-0 between stocked Walleye fry and fingerlings and naturally produced individuals; and 2) estimate and compare the economic costs of Walleye fry and fingerling production relative to their contribution to the age-0 catch in Lake McConaughy during 2022 and 2023.We collected 178 and 263 age-0 Walleyes from Lake McConaughy during the summer and fall of 2022 and 2023, respectively. Fingerling-stocked Walleye contributed 2.12 times in 2022 and 2.92 times more in 2023 than fry-stocked Walleye. Production cost estimates revealed that fry cost 1.08 and 1.35 times greater than fingerlings per stocking unit in 2022 and 2023, thus fingerlings were deemed the most cost-effective product in this study. Walleye stocked as fry were significantly longer at the time of collection in 2022 and were in significantly better condition in both years compared to fingerling stocked Walleye. Our results provide valuable insights for fisheries managers by offering a case study example as well as offering a practical approach to guide effective management decisions on which stocked product is most appropriate for other systems. Overall, this research enhances the existing literature on Walleye stocking in large reservoir systems, offering practical and useful information for effective management decisions.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433875","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Spatiotemporal dynamics and habitat use of red snapper (Lutjanus campechanus) on the southeastern United States Atlantic continental shelf","authors":"","doi":"10.1016/j.fishres.2024.107200","DOIUrl":"10.1016/j.fishres.2024.107200","url":null,"abstract":"<div><div>Red snapper (<em>Lutjanus campechanus</em>) is an iconic marine fish species along the southeast United States coast. Despite its ecological and economic importance, surprisingly little is known about red snapper biology and habitat use on the southeast United States Atlantic continental shelf (SEUS). We used data from a long-term baited trap and video survey (2011–2022), as well as from remotely operated vehicle (ROV) sampling (2021–2023), to quantify temporal changes in relative abundance, patterns of spatial distribution, and habitat use of red snapper in the SEUS. Using generalized additive models, we showed that red snapper increased in relative abundance from 2011 to 2022 by ∼ 1000 % in both trap and video samples. Red snapper relative abundance was highest in mid-shelf waters off the east coast of Florida, Georgia, and, to a lesser extent, off the Outer Banks of North Carolina; red snapper were less common off southern North Carolina and South Carolina. Highest relative abundance of red snapper occurred in locations with a moderate amount of natural structured habitat and high seafloor complexity and were never observed at randomly selected ROV stations (<em>n</em> = 197) lacking structured habitat. These results increase our understanding of the spatial and temporal distribution of red snapper, improve our knowledge of red snapper habitat use, and can be used when scaling local density estimates to the entire SEUS.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433874","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Geospatial and environmental drivers of genetic divergence in the Indo-West Pacific spiny lobster Panulirus ornatus","authors":"","doi":"10.1016/j.fishres.2024.107196","DOIUrl":"10.1016/j.fishres.2024.107196","url":null,"abstract":"<div><div>The tropical ornate spiny lobster, <em>Panulirus ornatus</em>, is distributed widely across the Indo-West Pacific and is a highly valued seafood species. The fine-scale genetic structure of this species was examined using 13 microsatellite loci from 298 lobsters collected from 17 locations from Tanzania in the west to New Caledonia in the east and compared with mitochondrial DNA (mtDNA) and genomic (SNP) from previous studies. Significant overall genetic differentiation was observed in the microsatellite data (F’_ST = 0.051, P &lt; 0.001), but these geographic patterns differed somewhat from those seen previously in mtDNA and SNP data. For both nuclear DNA (nDNA) and mtDNA there was significant genetic divergence and reduced diversity in lobsters from Western Australia and New Caledonia, likely due to genetic bottlenecks. However, the previously identified strong divergence of lobsters from the West Indian Ocean was only minimally supported in the microsatellite data, suggesting some recent gene flow across this region had eroded past divergence in this lineage. Geographic, environmental and ocean current variables were used to detect those factors associated with genetic divergence at both mtDNA and nDNA loci. Population divergences were only partially explained by geography and were not strongly related to ocean currents. Instead, there were significant associations with ocean vorticity, convergence and sea surface temperature. These implicate strong eddy systems, characterised by high levels of convergence and/or vorticity, in constraining larval dispersal. Overall, these findings help to identify the processes driving the genetic structure of <em>P. ornatus</em> populations and the results have considerable implications for the management of wild fisheries for this species.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142433873","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"An effective feature learning approach using genetic programming for crab age classification","authors":"","doi":"10.1016/j.fishres.2024.107197","DOIUrl":"10.1016/j.fishres.2024.107197","url":null,"abstract":"<div><div>Reliable age estimation plays an important role in managing populations of marine organisms. The extraction and analysis of eyestalks and gastric mill ossicles for determining the age of crabs are difficult and extremely time consuming. In this paper, we propose a novel Genetic Programming (GP) approach to learning high-level features from easily accessible features of crabs, such as length, weight, and sex, for crab age classification. We develop a new representation of GP to extend the width and depth of GP trees, so as to automatically generate a flexible number of high-level features without extensive domain knowledge. With the high-level features and easily accessible features, the new GP approach is subsequently wrapped with classifiers, e.g., Support Vector Machine (SVM), to effectively classify the crab age. The performance of the proposed GP approach is compared with five mainstream machine learning classification algorithms. Experiments show that the high-level features learned by GP improve the classification accuracy of crab age classification. Moreover, the learned features have good interpretability.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422067","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Short-term discard survival and catch-related trauma in European plaice (Pleuronectes platessa) caught in the Baltic Sea by Danish seine during summer","authors":"","doi":"10.1016/j.fishres.2024.107204","DOIUrl":"10.1016/j.fishres.2024.107204","url":null,"abstract":"<div><div>Danish seine is an active fishing gear targeting demersal species, such as European plaice (<em>Pleuronectes platessa</em>, hencefort referred as plaice), a commercially important fish species in the North Sea, Skagerrak, Kattegat, and Baltic Sea. Danish seining is a relevant fishery in relation to exemption from the European Union landing obligation. Trials were conducted from a commercial fishing vessel during the summer with high air temperatures and sea salinity and marked salinity and temperature gradients (pycnocline). Video equipment was used to observe fish entering the seine. Captured fish were individually tagged and housed in livewells for ten days to observe short-term survival. Reflex impairments and external injuries were assessed after capture and at the end of the observation periods using reflex action mortality predictor (RAMP) and catch-damage index (CDI) methodologies. We found that plaice entered the seine late in the towing process and that 87 % of the assessed fish survived, after 10 days of observation. There was a significant difference in short-term survival curves for fish that had been subjected to more than 30 min of on-deck during the catch-sorting process relative to those that had remained on deck for 30 min or less. The association between the time on deck and RAMP scores after capture was also significant. External injuries were primarily minor bruises, fin fraying, and net marks and changed little from after capturing to the end of the observation period.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422065","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Seasonal migration of a male Jasus lalandii sub-population","authors":"","doi":"10.1016/j.fishres.2024.107201","DOIUrl":"10.1016/j.fishres.2024.107201","url":null,"abstract":"<div><div>Seasonal movement patterns of a sub-population of the West Coast rock lobster (WCRL), <em>Jasus lalandii</em>, in a fisheries-relevant area of South Africa were investigated from 2010 to 2018 by abundance and tag/recapture surveys. A small sub-population (3144 out of 152 914 WCRL analysed) of large male WCRL (carapace length ≥ 75 mm) gathered in a deep (± 200 m) commercial fishing area in January – May, whereas they are rare or absent in the periods between. This distribution was consistent with tagging information from 502 recaptured WCRL (from 15 211 tagged) which revealed an inshore movement (mainly in a NE direction) of a male sub-population (carapace length ≥ 75 mm = legal size) starting in austral autumn. The mean straight-line movement was 30.4 ± 0.6 km (maximum 75 km) and a mean time at large of 301 ± 15 days (maximum 3000 days) were recorded. The study revealed therefore the destination of the lobsters’ migration but not its origin.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422066","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The economic benefit of spearfishing as an impure public good: A case study of invasive Lionfish in Florida","authors":"","doi":"10.1016/j.fishres.2024.107194","DOIUrl":"10.1016/j.fishres.2024.107194","url":null,"abstract":"<div><div>Lionfish (<em>Pterois miles and P. volitans</em>) is a highly invasive species originally from the South Pacific and Indian Oceans. As an effort to control its exponentially growing population, the Florida Fish and Wildlife Conservation Commission has launched a program called “Lionfish Challenge” to promote harvesting of lionfish from Florida waters. The program provides anglers with a unique recreational opportunity because they would need to dive and spearfish to harvest lionfish. Furthermore, participants in the program not only gain utility from spearfishing as a private good but also as a public good, knowing that they are contributing to the ecosystem in Florida waters. This paper contributes to the literature by measuring the economic benefit for participants from spearfishing as an impure public good. Using data provided by the Florida Fish and Wildlife Conservation Commission, a travel cost method was applied to model the demand for lionfish fishing trips. Data included information about counties where lionfish were harvested at the trip-level, but only if participants took a trip and harvested lionfish. Therefore, those who are good at catching lionfish had a higher probability of being included in the data. To account for potential sample selection bias, a probability weight was applied, using the average number of lionfish harvested as a proxy. Results indicate that the per-trip consumer surplus per participant was between $965.89 and $1,597.36, depending on model specifications, with the preferred specification indicating a mean CS of $1,117.72 per trip. The seasonal consumer surplus per participant was indicated to be between $4,550.45 and $3487.91, again, depending on model specification.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Artisanal longline fishing for Greenland halibut (Reinhardtius hippoglossoides) operated under sea ice using a metal plate kite in northwest Greenland","authors":"","doi":"10.1016/j.fishres.2024.107203","DOIUrl":"10.1016/j.fishres.2024.107203","url":null,"abstract":"<div><div>Understanding the deployment ranges and behavior of fishing gear in relation to fishery efficiency will help us grasp the potential impact of future shifts in the fishery on resources and fishing activities. Fisheries for Greenland halibut are conducted by boat in open water during the summer. However, in winter, fishermen travel to fishing grounds on the sea ice using dog sleds, drill holes in the ice, and deploy longlines using metal plate kites. While the scale of deployment varies between boat and ice longlining, the movement of kites used in ice longlining and their effect on the deployment range of the line is not well understood. We conducted experiments using an accelerometer to determine the underwater movement of kites and their effect on the horizontal range of longline deployment. This is the first report describing specific operational information on longline fishing under sea ice, specifically on the effects of the kite on longline deployment. The kite is attached to the leading end of the mainline and deploys the longlines horizontally as it moves downward towards the sea floor. When the kite and mainline are dropped into the sea, the kite extends the line horizontally while shifting forward-facing long side, and forward-aligned short side. The motion resembles a fluttering action primarily influenced by the Reynolds number and moment of inertia. When the mainline is held, the kite descends in a circular motion. With repeated fishing operations and the passage of time, the kite's movement is expected to decrease in both range and speed due to the buoyancy and tension of the mainline. These kite movements suggest that the deployment range of longlines could extend several hundred meters. Therefore, it can be inferred that the impact of winter ice fishing on the Greenland halibut stock is relatively low due to the limited deployment range of the longline when using the kite.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-10-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422063","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}