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catch per unit effort,maximum sustainable yield and exploitation of demersal fish of Omani artisanal fishery

Journal of Coastal Life Medicine 2016年第6期4卷 440-443页

作者： Medhat Abd El Barr Department of Oceanography Alexandria UniversityPostal code 21556-Al AnfoushiAlexandriaEgypt

Objective:To evaluate exploitation status of the stocks of demersal fishes in Omani artisanal ***:Time-series data between 2005 and 2014 on catches and effort represented by the number of fishing boats were used to estimate catch per unit effort and maximum sustainable yields applying Schaefer surplus production *** analyses were made online using GraphPad ***:The study revealed that increasing the number of boats on the fishery caused a decrease of catch per unit effort of some *** sustainable yields and exploitation status were estimated for these species ***:Some demersal fish species were found to be caught in quantities exceeding maximum sustainable yields during some fishing seasons indicating overexploitation of their stocks.

关键词： catch per unit effort Maximum sustainable yield Surplus production models Demersal fish Sultanate of Oman

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A comparison between benthic gillnet and bottom trawl for assessing fish assemblages in a shallow eutrophic lake near the Changjiang River estuary

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Journal of Oceanology and Limnology 2018年第2期36卷 572-586页

作者： LI Yalei LIU Qigen CHEN Liping ZHAO Lianjie WU Hao CHEN Liqiao HUT Zhongjun Key laboratory of Freshwater Fishery Germplasm Resources Ministry of Agriculture Shanghai Ocean University Shanghai 201306 China Xinyang College of Agriculture and Forestry Xinyang 464000 China Nanjing Institute of Environmental Science Ministry of Environmental Protection Nanjing 210042 China School of Life Science East China Normal University Shanghai 200062 China

Two fishing methods including gillnetting and trawling to estimate attributes of fish assemblage were compared in Dianshan Lake from August 2009 to July 2010. Species composition dif fered significantly between the gears, with four significant contributors in gillnet catches and one in trawl catches. Trawling collected more proportions of benthic species by number and biomass than gillnetting. Size distribution was significantly influenced by fishing technique; gillnetting captured relatively less small-sized fishes and trawling captured less large-sized individuals. Trawling produced species richness closer to the one expected than gillnetting. On the whole, trawl catch was a quadratic polynomial function of gillnet catch and a significantly negative correlation was found between them, both of which varied as dif ferent polynomial functions of temperature. However, trawl and gillnet catches were significantly correlated only in one of five month groups. It is concluded that single-gear-based surveys can be misleading in assessments of attributes of fish assemblages, bottom trawling is a more ef fective gear for assessing fish diversity than benthic gillnetting, and using gillnet catches as an indicator of fish density depends on fishing season in the lake.

关键词： fishing gear expected species richness size structure catch per unit effort temperature

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Application of a Delay-Difference Model for the Stock Assessment of Southern Atlantic Albacore(Thunnus alalunga)

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Journal of Ocean University of China 2015年第3期14卷 557-563页

作者： ZHANG Kui LIU Qun KALHORO Muhsan Ali Department of Fisheries Ocean University of China

Delay-difference models are intermediate between simple surplus-production models and complicated age-structured models. Such intermediate models are more efficient and require less data than age-structured models. In this study, a delay-differ- ence model was applied to fit catch and catch per unit effort （CPUE） data （1975-2011） of the southern Atlantic albacore （Thunnus alalunga） stock. The proposed delay-difference model captures annual fluctuations in predicted CPUE data better than Fox model. In a Monte Carlo simulation, white noises （CVs） were superimposed on the observed CPUE data at four levels. Relative estimate error was then calculated to compare the estimated results with the true values of parameters a and fl in Ricker stock-recruitment model and the catchability coefficient q. a is more sensitive to CV than fl and q. We also calculated an 80% percentile confidence interval of the maximum sustainable yield （MSY, 21756 t to 23408 t; median 22490 t） with the delay-difference model. The yield of the southern Atlantic albacore stock in 2011 was 24122t, and the estimated ratios of catch against MSY for the past seven years were approxi- mately 1.0. We suggest that care should be taken to protect the albacore fishery in the southern Atlantic Ocean. The proposed de- lay-difference model provides a good fit to the data of southern Atlantic albacore stock and may be a useful choice for the assessment of regional albacore stock.

关键词： delay-difference model albacore (Thunnus alalunga) catch per unit effort Ricker model stock-recruitment relationship maximum sustainable yield

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Estimating the total allowable catch and management of Threadfin porgy(Evynnis cardinalis)fisheries in the northern South China Sea based on sampling surveys conducted at fishing ports

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Aquaculture and Fisheries 2024年第2期9卷 273-279页

作者： Bo Feng Zhonglu Li Huosheng Lu Yunrong Yan Gang Hou Guangdong Provincial Far Sea Fisheries Management and Fishing Engineering Technical Research Center Fisheries CollegeGuangdong Ocean UniversityZhanjiang524088China Marine Resources Big Data Center of South China Sea Southern Marine Science and Engineering Guangdong Laboratory(Zhanjiang)Zhanjiang524025China

In order to develop a method that apply sampling survey data randomly obtained at fishing ports to fish stock assessments,based on fish landing surveys conducted at fishing ports in the northern South China Sea(SCS),19 Threadfin porgy(Evynnis cardinalis)catch per unit effort(CPUE)datasets were collected for fishing vessels with different gear types and engine powers and incorporated into surplus production *** only the fitting performance,the Schaefer model had the best overall goodness of fit,followed by the Fox,CYP,W-H,and Schnute *** fishing vessels with different gears and engine powers,the data were best fitted for single-trawl vessels powered by 301-400-kW engines and for gillnet vessels powered by>200-kW *** model expressions were superior and selected for subsequent analyses based on their goodness of fit and relative *** Kobe plot analysis results showed an optimistic fish stock status when using the four model expressions,required more caution when using three model expressions and output pessimistic estimations using one model *** the incomplete information acquired,a compromising decision-making method was used to derive a 2017 northern SCS *** total allowed catch(TAC)of 44,691.21 *** different conclusions drawn from estimations using CPUEs reflect variable exploitation and utilization fish stock statuses among fishing vessels with different gears and engine ***,the fishing operations were grouped according to their CPUE relationship,and recommendations regarding optimum fishing efforts were assigned to the groups following a fundamental principle:to improve fishery TAC management,fishing efforts should be reduced if the fish stock assessment is pessimistic and maintained if the assessment is *** study providing a feasible technical method for the TAC management of China’s offshore fisheries.

关键词： Evynnis cardinalis catch per unit effort Total allowable catch Fishery management Northern South China Sea

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Identification and Mapping of Essential Fish Habitats Using Remote Sensing and GIS on Lake Victoria, Kenya

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Journal of Geoscience and Environment Protection 2021年第10期9卷 91-109页

作者： Mark Kipkurwa Boitt Erick Otieno Aete Institute of Geomatics GIS and Remote Sensing (IGGReS) Dedan Kimathi University of Technology Nyeri Kenya Department of Geomatic Engineering and GIS (GEGIS) Jomo Kenyatta University of Agriculture and Technology Nairobi Kenya

Fisheries in Lake Victoria have been threatened by declining fish stocks and diversity, environmental degradation due to increased input of pollutants, industrial and municipal waste, overfishing and use of unapproved fishing methods, infestation by aquatic weeds especially water hyacinth, de-oxygenation and a reduction in the quantity and quality of water. Remote sensing and GIS are essential tools in detection of fishing grounds which is important in providing fish sustainability for human beings and allows fishing grounds detection at minimal cost and optimizes effort. This research tends to identify the most favorable both environmentally and ecologically satisfactory factors which favor fish breeding and growth. The main aim of the study was to identify habitat variables that promote fish breeding and growth to maturity including the extraction of environmental variables from Landsat 8 images for the study period and using suitability index derived from fishery data. The study concentrated on establishing suitability ratings in different parts of Lake Victoria using lake surface temperature and chlorophyll-a levels. The study was conducted for months;January, May and December 2019 on Lake Victoria (limited by the availability of recent data). The factors were analysed and the favorable regions mapped satisfying the conditions for fish breeding. The output obtained illustrated the availability of suitable and habitable zones within the lake using satellite imagery and the suitability index. The fish catch data and satellite derived variables were used to determine habitat suitability indices for fish during January, May and December 2019. More than 90% of the total catch was found to come from the areas with sea surface temperature of 23.0˚C - 28.3˚C and chlorophyll-a concentration between 0.72 -

关键词： catch per unit effort Potential Fishing Zones Geographic Information Systems High Resolution Satellite Image Habitat Suitability Index

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