Fisheries Research最新文献

{"title":"Using species-specific behavior to improve catch efficiency of target species in mixed trawl fisheries","authors":"Ludvig A. Krag ,&nbsp;Rikke P. Frandsen ,&nbsp;Bent Herrmann ,&nbsp;Grete E. Dinesen ,&nbsp;Junita D. Karlsen","doi":"10.1016/j.fishres.2024.107232","DOIUrl":"10.1016/j.fishres.2024.107232","url":null,"abstract":"<div><div>Demersal trawl fisheries are increasingly challenged by new and more ambitious gear regulations alongside rising fuel costs. However, knowledge of behavioral differences between species are yet poorly integrated and exploited in commercially operated trawl designs. In the demersal mixed species trawl fishery for <em>Nephrops</em> (<em>Nephrops norvegicus</em>), many fish species are herded by the netting and actively avoid contact with the meshes as opposed to <em>Nephrops</em>, for which most individuals are tumbling along the bottom panel of the gear towards the codend. By reducing the mesh size of the entire lower half of the trawl we reduced the loss of marketable sized <em>Nephrops</em> through the bottom panels significantly by 47.2 % (CI: 33.6–60.2 %) in the North Sea. The unchanged catches of the round fish, cod (<em>Gadus morhua</em>) and hake (<em>Merluccius merluccius</em>) confirm that these species do not come in physical contact with the bottom panel. In contrast, witch flounder (<em>Glyptocephalus cynoglossus</em>) escapes through the bottom panel of the baseline trawl as the treatment gear caught 65.1 % (CI: 39.5–104.9 %) more marketable-sized individuals and 259.7 % (CI: 144.4–459.5 %) more undersized individuals. Our results confirm known species-specific behavior in the forward part of the trawl and demonstrate how this can be exploited with simple design changes to increase the catch efficiency for <em>Nephrops</em> and likely other species without affecting the catches of roundfish. The undersized individuals captured will largely escape through the meshes used in commercial codends.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107232"},"PeriodicalIF":2.2,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698762","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":"Ice angling for northern pike (Esox lucius) with tip ups: Hook style affects angler catch and fish welfare","authors":"Julee Stewart,&nbsp;Shayna Cossette,&nbsp;Christopher M. Somers","doi":"10.1016/j.fishres.2024.107227","DOIUrl":"10.1016/j.fishres.2024.107227","url":null,"abstract":"<div><div>Catch and release ice angling exposes fish to environments and techniques that differ markedly from those in the open-water season. Accordingly, we studied the influence of quick-strike treble hooks and 0º offset circle hooks on aspects of northern pike (<em>Esox lucius</em>) capture and behaviour using tip-ups during the winter. Based on 221 northern pike captured over three winters, quick strike rigs with multiple hooks had higher catch success, but extended dehooking time and caused more foul hooking. Deep hooking events were infrequent but were most likely to occur when pike were captured on the single treble quick strike rig and circle hook. Camera footage revealed that pike were tentative and appeared to require considerable time to strike. Hook style had no influence on fish behaviour when striking. Our findings suggest that the use of triple treble quick strike rigs may provide benefits to anglers because they hook more and slightly larger fish and do not result in deep-hooking events. Circle hooks caught in the jaw most frequently and were the easiest to remove most of the time; however, they periodically deep-hooked fish, which was unexpected. Ultimately, angler tackle choice will affect their enjoyment of ice angling, and the potential for stress and injury to fish when using tip ups.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107227"},"PeriodicalIF":2.2,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142720019","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":"Does the presence of a pop-up satellite archival tag affect movement of Tanner crab (Chionoecetes bairdi) in an exposed Alaskan bay?","authors":"Andrew J. Nault ,&nbsp;William B. Gaeuman ,&nbsp;Benjamin J. Daly ,&nbsp;Aspen E. Coyle","doi":"10.1016/j.fishres.2024.107228","DOIUrl":"10.1016/j.fishres.2024.107228","url":null,"abstract":"<div><div>Fluctuating environmental conditions and crab population declines in the Bering Sea have elevated interest in pop-up satellite archival tags (PSATs) as a tool for investigating changes in crab spatial dynamics. However, PSATs are large relative to crab body sizes and may impact behavior which could limit their utility for informing management and conservation efforts. Accordingly, we tagged adult male Tanner crabs <em>Chionoecetes bairdi</em> with either a small acoustic tag (<em>n</em> = 20) or with both an acoustic tag and PSAT (<em>n</em> = 20) and monitored their movements within an acoustic receiver array in an exposed bay near Kodiak, Alaska. We evaluated several metrics intended to detect any between-group differences in movement or habitat use over the 78-day study. No group differences were observed, likely due to the small hydrodynamic forces acting on the PSAT relative to those acting on the crab. We encourage expanded use of PSATs in future crab research, but efforts should explore species-specific tag effects to help ensure accurate movement information is available for fishery management decisions.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107228"},"PeriodicalIF":2.2,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698763","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":"Size selectivity of Muller’s pearlside (Maurolicus muelleri), glacier lanternfish (Benthosema glaciale) and krill in trawls targeting the mesopelagic fish","authors":"Enis N. Kostak ,&nbsp;Bent Herrmann ,&nbsp;Eduardo Grimaldo ,&nbsp;Jesse Brinkhof","doi":"10.1016/j.fishres.2024.107229","DOIUrl":"10.1016/j.fishres.2024.107229","url":null,"abstract":"<div><div>The growing interest in harvesting mesopelagic fish increases the need for knowledge about trawl designs with high catch efficiency. Limited swimming ability of small mesopelagic species makes it important to consider potential net selectivity along the entire trawl body. Net makers designing trawls for harvesting mesopelagic species need to know which mesh sizes can be used in the low tapered belly sections and in the codend of trawls to avoid catch loss due to size selectivity. Therefore, we used an experimental design that enabled us to quantify both aft belly and codend size selection of Muller’s pearlside (<em>Maurolicus muelleri</em>), glacier lanternfish (<em>Benthosema glaciale</em>), and krill (Euphausiidae) for three different mesh sizes relevant to the mesopelagic fishery. Our results confirmed that size selection needs to be considered in both the belly section and codend of the trawl but that the size selection in the codend is much more effective than that in a short, low tapering belly section. Further, predictions based on the estimated size selectivity showed that the catch efficiency can be low with the currently used mesh sizes in trawls targeting mesopelagic species, demonstrating that the choice of mesh size in the codend is a critical parameter.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107229"},"PeriodicalIF":2.2,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698767","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":"Angler catch data as a monitoring tool for European barbel Barbus barbus in a data limited recreational fishery","authors":"C. Gutmann Roberts ,&nbsp;A.S. Tarkan ,&nbsp;M.E. Hanley ,&nbsp;J.R. Britton","doi":"10.1016/j.fishres.2024.107224","DOIUrl":"10.1016/j.fishres.2024.107224","url":null,"abstract":"<div><div>Large bodied freshwater fishes can be important target species for recreational anglers, with some species introduced intentionally to diversify angling experiences. European barbel <em>Barbus barbus</em> is an important target species in many riverine fisheries, including the River Severn and its River Teme tributary, western England, where it has supported a catch-and-release recreational fishery for approximately 50 years. The River Teme was renowned for the quality of its barbel angling from the 1980s. Since 2007, angler dissatisfaction has increased substantially in this fishery, being associated with alleged declines in the number of barbel being captured and in their population abundances. As there were few data available at that time to investigate these declines, data from periodic electric fishing surveys and some angler catch data were sourced. Analyses revealed temporal declines in the number of sampled barbel during electric fishing surveys, although the number of surveys was low, varied between years and did not target barbel specifically. Analyses of four angler catch data sets (1995–2022) involving more than 1000 captured barbel of 0.5–5.3 kg also revealed significant temporal declines in barbel catches (by number and catch-per-unit-effort). These catch declines were generally coincident with reductions in angler presence and effort on the river, suggesting low catches were a driver of angler dissatisfaction. These results provide empirical support for angler claims of substantial declines in barbel catches and abundances, and emphasise that even limited volumes of angler catch data are useful for understanding temporal changes in exploited but data limited fish populations.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107224"},"PeriodicalIF":2.2,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698766","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":"Expected improvements in precision when integrating opportunistic close-kin mark-recapture data into fisheries stock assessments","authors":"Nicholas Fisch","doi":"10.1016/j.fishres.2024.107222","DOIUrl":"10.1016/j.fishres.2024.107222","url":null,"abstract":"<div><div>Close-Kin Mark-Recapture (CKMR) sampling, by providing information on abundance and survival rates (and potentially other quantities), offers a promising new data source for fisheries stock assessments. Sample design in order to achieve a desired precision is somewhat straightforward in simple CKMR models; however when integrated within a full stock assessment model with many other data sources, the value of the data (in terms of a reduction in uncertainty of model estimates) is less clear. Herein I demonstrate, using self-test simulations, the expected improvements in precision and accuracy of derived quantities and estimated parameters within statistical catch-at-age models when opportunistic CKMR sampling is conducted and the data integrated within the assessment. By opportunistic CKMR sampling I mean to describe the genetic sampling of individuals that comprise the age composition data, such that increases in CKMR sampling would also increase the age composition samples (and vice versa). I examine the expected improvements across three life history types (cod-like, flatfish-like, and sardine-like) and different amounts of data available to the assessment, including the uncertainty and inclusion of an abundance index and the sample size and time series length of CKMR and age composition samples. Results suggest CKMR data can provide considerable improvements in accuracy and precision of spawning stock biomass at the end of the time series and parameters defining natural mortality and scale of the population, provided an adequate annual sample size is collected relative to the spawning abundance of the stock during the period of CKMR inference. The time-series length of CKMR data and uncertainty or inclusion of an abundance index played a much more moderate role in how much improvement CKMR data provided over models fit without CKMR. This result was likely a function of the model being privy to an effectively known catch time series and known steepness, allowing it to estimate stock scale and trend reasonably well without CKMR data given informative composition data. I recommend simulation analyses including stock assessments as estimation models be carried out for those considering routinely collecting and integrating CKMR data into fisheries stock assessments.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107222"},"PeriodicalIF":2.2,"publicationDate":"2024-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698765","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":"Impact of tropical cyclones on fishing activity in the Philippines","authors":"Miloud Lacheheb ,&nbsp;Ilan Noy ,&nbsp;Madhavi Pundit","doi":"10.1016/j.fishres.2024.107221","DOIUrl":"10.1016/j.fishres.2024.107221","url":null,"abstract":"<div><div>We identify the main fishing grounds in the Philippines’ maritime Exclusive Economic Zone and track the response of fishing vessels’ activity to tropical cyclones (TCs) during 2012. We use satellite imagery from the National Oceanic and Atmospheric Administration to locate fishing vessels and identify the main fishing grounds. We combine these with data on TCs' speed and trajectory from the International Best Track Archive for Climate Stewardship. We use kernel density functions to identify fishing grounds and Vector Generalized Linear Model and Bayesian Time-Varying Parameter to assess the impact of TC speed on the location of fishing vessels during and after the TC. Our quantifications reveal the overall negative impact of TCs on the number of active boats during and 2 days after the TC. The fishing grounds located within the Sibuyan Sea, Visayan Sea, and Panay Gulf are the most affected areas. Daily reduction in the commercial fishing production in Western Visayas alone for every day a TC passed through was estimated at 7800 tons per day, affecting more than 188,000 families.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107221"},"PeriodicalIF":2.2,"publicationDate":"2024-11-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142698764","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":"Drivers of change in the spatial dynamics of the Central Amazon artisanal fishing fleet","authors":"Samantha Aquino Pereira ,&nbsp;Nídia Noemi Fabré ,&nbsp;Vandick da Silva Batista ,&nbsp;Sophie Lanco","doi":"10.1016/j.fishres.2024.107220","DOIUrl":"10.1016/j.fishres.2024.107220","url":null,"abstract":"<div><div>The use of fishery resources by artisanal fishers in the Amazon is highly adaptive and may be influenced by environmental drivers such as river level fluctuations and seasonality, as well as anthropogenic factors like fuel prices and the creation of protected areas. These factors may limit access to habitats and species and thereby affect the spatial distribution of the fishing fleet. This study investigated whether and, if so, how the spatial distribution of the Central Amazon fishing fleet (CAFF) was affected by a series of environmental and anthropogenic variables over an 11-year period (1994–2004). We analyzed landings of the artisanal commercial fleet in Manaus and identified habitat types, target species, as well as hydrological anomalies, variations in fuel prices and the increase in the number of protected areas. In addition, we evaluated the drivers that determine the distribution of the CAFF. Our results demonstrated a contraction in the distance covered and surface explored by the CAFF, especially since 1998. River types, river levels, CPUE of river-lacustrine species, oil prices and hydrological anomalies had a significant effect on the dynamics of the CAFF.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107220"},"PeriodicalIF":2.2,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655482","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":"Optimal configuration and three-dimensional light field of fishing lights on a squid fishing boat obtained using a space matrix algorithm","authors":"Ying Zhang ,&nbsp;Xiaoshuang Huang ,&nbsp;Xinjun Chen ,&nbsp;Bilin Liu ,&nbsp;Xianghong Kong ,&nbsp;Qiankai Deng","doi":"10.1016/j.fishres.2024.107223","DOIUrl":"10.1016/j.fishres.2024.107223","url":null,"abstract":"<div><div>The optimal configuration of squid fishing lights and the rational distribution of the three-dimensional light field are crucial research topics in the field of light-attracting fisheries. In the present study, light-emitting diode (LED) fishing lamps were measured to have a power of 150 W, luminous flux of 1693 lm, maximum luminous intensity of 907 cd, luminous efficiency of 13.0 lm/W, beam angle of 85.125°, and beam axis deviation angle of 1.0625°. A numerical calculation model based on the spatial matrix algorithm was established to determine the effective water volume of the LED fishing lamps. The three-dimensional effective water volume of fishing lamps was then simulated to study the effectiveness of lighting configurations for a type-8154 squid fishing boat. The results indicate that LED fish-aggregating lamps are most effective when the spacing between lamps is 1.0 m, the lamp height above the water is 6.5 m, and the illumination is within the range of 0.1–10 lx. The iso-illuminance line of 0.1 lx has a depth of approximately 37 m and a horizontal distance from the ship of approximately 51 m whereas the iso-illuminance line of 10 lx has a depth of approximately 14 m and a horizontal distance from the ship of approximately 33 m. The total effective water volume under these conditions is approximately 3.0 × 10⁵<span><math><msup><mrow><mspace></mspace><mi>m</mi></mrow><mrow><mn>3</mn></mrow></msup></math></span>. This paper highlights how the strong anisotropic specificity of LED fish-aggregating lights plays a crucial role in determining specific illumination volumes for the optimal fishing efficiency of light-fishing vessels.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107223"},"PeriodicalIF":2.2,"publicationDate":"2024-11-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655483","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":"Comfort in stratification and trophic flexibility: argentine anchovy, Engraulis anchoita, larvae life traits in relation to their food sources","authors":"Marina Do Souto ,&nbsp;Daniel Roberto Brown ,&nbsp;Ezequiel Leonarduzzi ,&nbsp;Ricardo Ismael Silva ,&nbsp;Ana Martínez ,&nbsp;Georgina Cepeda ,&nbsp;Gustavo Javier Macchi ,&nbsp;David Edgardo Galván ,&nbsp;Marina Vera Diaz","doi":"10.1016/j.fishres.2024.107215","DOIUrl":"10.1016/j.fishres.2024.107215","url":null,"abstract":"<div><div>Fish larvae feeding success is crucial for adult recruitment, which affects both fisheries and ecosystem regulation processes. <em>Engraulis anchoita</em> is a species of great ecological and fishing relevance in the South-West Atlantic Ocean, with a wide latitudinal distribution and active spawning throughout the year and strongly associated with frontal areas. <em>E. anchoita</em> larvae have been described as exclusively feeding on small copepods and their early developmental stages. In this study, the diet, nutritional condition, and daily growth of <em>E. anchoita</em> larvae were estimated in different environmental scenarios in the South-West Atlantic Ocean. Carbon and Nitrogen stable isotopes analysis, otolith microstructure analysis, and RNA/DNA index determination were performed. The larval diet, which was evaluated based on the availability of potential prey, varied with respect to the water column stability. It was observed that the larvae tend to feed on microphytoplankton in stratified waters and on calanoid copepods in waters with a homogeneous vertical structure. The growth and nutritional condition indexes responded to ontogeny, presenting higher values at larger larval sizes. Growth indexes also responded positively to the stratified water column structure in comparison to the homogeneous one. The nutritional condition index was only explained by the size of the individuals. This study found that <em>E. anchoita</em> larvae had greater trophic flexibility than previously suspected, as they included microphytoplankton as the main food item under certain oceanographic conditions without negative impacts on their growth or nutritional condition.</div></div>","PeriodicalId":50443,"journal":{"name":"Fisheries Research","volume":"281 ","pages":"Article 107215"},"PeriodicalIF":2.2,"publicationDate":"2024-11-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142655481","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}