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| Registros recuperados: 173 | |
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| Bonhommeau, Sylvain; Fromentin, Jean-marc. |
| This study aims at examining the potential bias in the VPA estimates by simulating a population, catch and CPUEs over 39 years from 1970 to 2008. In the operational model, two levels of noise were added to catch and CPUEs (50 and 100%), three fishing patterns were explored (F=FMSY, F increases linearly from 0.5 FMSY to 2.5 FMSY, F increases linearly from 0.5 FMSY to 2.5 FMSY over the first 34 years and decreases down to FMSY over the last 5 years). We also tested different hypothesis about the impact of the terminal F-ratios, and the natural mortality used in the current VPA as well as the impact of randomly generated CPUE for long-line and trap CPUE. Results show that the VPA is robust to estimate the SSB whatever the noise level in the catch and the... |
| Tipo: Text |
Palavras-chave: Bluefin tuna; Stock assessment; VPA; Management regulations; TAC. |
| Ano: 2011 |
URL: http://archimer.ifremer.fr/doc/00192/30280/28755.pdf |
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| Marchal, Emile; Petitgas, Pierre. |
| The gulf of Cariaco, Venezuela, is a rather isolated piece of coastal ocean where spatio-temporal variability has been measured. In 1986, three repeated surveys have been carried out in this gulf. The important differences in biomass estimates are attributed to sampling error only. The biological nature of this variability is studied. It is due to a high concentration of the biomass in a few schools and correlatively to the hit or the miss of these large schools, during the sampling. Structural information for predicting them is sought. Also, the number of schools per elementary sampling distance unit (ESDU) and the biomass in each school were measured by echointegration. It is found that there is no clear relation between these two variables. Thus their... |
| Tipo: Text |
Palavras-chave: Evaluation des stocks; Campagnes acoustiques; Précision; Stock assessment; Echo surveys; Reliability. |
| Ano: 1993 |
URL: http://archimer.ifremer.fr/doc/00190/30077/28565.pdf |
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| Campbell, R.A.; Tuck, G.N.. |
| Due to the general lack of targeted fisheries on billfish, the resource status of these species within the Indian Ocean has not been analysed in any previous study and currently remains unknown. Nevertheless, significant quantities of billfish are caught annually in the Indian Ocean and, being generally long lived, these species remain vulnerable to overfishing. In this paper preliminary indices of stock availability are presented for the main billfish species based on the catch and effort data pertaining to the Japanese and Taiwanese Indian Ocean longline fisheries. While the indices need to be treated with some caution (due to problems relating to the accuracy of the catch and effort data, and the fact that changes in catchability have not been factored... |
| Tipo: Proceedings Paper |
Palavras-chave: Catch/effort; Stock assessment; Overfishing; Catchability; Fishing gear. |
| Ano: 1998 |
URL: http://hdl.handle.net/1834/58 |
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| Okemwa, E.; Wakwabi, E.; Getabu, A.. |
| Topics on Lake Victoria limnology, benthic fauna, stock assessment, catch assessment survey, gear selectivity, fisheries ecology, fish parasites and marketing economics are covered. Management and conservation of the lake's fisheries and other aquatic resources are discussed. Dialogue between fishermen, scientists and administrators is stressed, measures to be undertaken are addressed and further research is recommended. |
| Tipo: Proceedings Paper |
Palavras-chave: Fishery management; Freshwater fish; Inland fisheries; Lake fisheries; Limnology; Resource management; Stock assessment; Zoobenthos; Fishery management; Lake fisheries; Limnology; Stock assessment; Inland fisheries; Resource management; Zoobenthos; Http://aims.fao.org/aos/agrovoc/c_24026; Http://aims.fao.org/aos/agrovoc/c_4159; Http://aims.fao.org/aos/agrovoc/c_4343; Http://aims.fao.org/aos/agrovoc/c_24251; Http://aims.fao.org/aos/agrovoc/c_3873; Http://aims.fao.org/aos/agrovoc/c_6524; Http://aims.fao.org/aos/agrovoc/c_15487. |
| Ano: 1994 |
URL: http://hdl.handle.net/1834/2125 |
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| Mauna, A.C.. |
| CDATA[Patagonian scallop (Zygochlamys patagonica) is a suspension feeder bivalve that presents the highest concentrations of recruits associated to the shelf-break front; but the temporal pattern of these recruitments have not been described in detail. Given the importance of recruitments for the development of the fishery and the population dynamics of the resource, in this report space-time distribution [catch per unit of effort (CPUE) of specimens =<, 15 mm, age 0+] is described and comparison between years and the Management Units (MU) 1.2 and 2 carried out. The study area corresponds to the North Management Sector of the patagonian scallop fishery (38º S-39º 30’ S, 55º W-56º W), Argentine Sea, SW Atlantic Ocean. The null hypothesis on recruitment... |
| Tipo: Journal Contribution |
Palavras-chave: Scallop fisheries; Catch/effort; Recruitment; Stock assessment; Shelf fronts. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5488 |
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| Hansen, J.E.; Buratti, C.C.; Garciarena, A.D.. |
| Advise on Biologically Allowable Catch (BAC) for Southern Argentine anchovy (Engraulis anchoita, 41° S-48° S) during 2012. To assess the evolution since 1990 and the current status of Argentine anchovy Southern stock, an Age Structured Population Model (ASPM) was used. Modeling of catches according to a four-month period pulses allowed to predict annual yields so as to get them close to the nominal catches officially recorded. Some independent indexes of stock abundance (eight acoustic estimates of total biomass and five estimates of spawning stock biomass obtained with the Daily Egg Production Method) and the proportion of individuals per age group assessed during the same cruises were used to calibrate the fitting. No stock-recruitment function but a... |
| Tipo: Journal Contribution |
Palavras-chave: Stock assessment; Yield; Statistical models; Age composition; Clupeoid fisheries. |
| Ano: 2013 |
URL: http://hdl.handle.net/1834/5508 |
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| The emphasis of the meeting was placed on bigeye tuna (Thunnus obesus), but a number of the conclusions and recommendations reached apply equally to all tropical tunas. A review of fisheries and available data confirmed that both longline and purse seine fisheries for bigeye tuna have been expanding rapidly over the current decade. There are however major gaps in catch and effort data available, in particular major longline fleets operating from Indonesia and several eastern Indian Ocean ports and some which are engaged in illegal, unregulated and unreported (IUU) fishing. Furthermore, size data for most longline fisheries are generally missing or of doubtful quality. A number of recommendations on research were formulated, dealing with improvements in... |
| Tipo: Working Paper |
Palavras-chave: Fishery statistics; Tuna fisheries; Fishery data; Stock assessment; Tropical environment. |
| Ano: 1999 |
URL: http://hdl.handle.net/1834/118 |
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| The report of the session is presented under the following major section headings: 1) Opening of the meeting; 2) Progress in the acquisition of funds for financing the tagging programs; 3) The problem of bait; 4) Development of specific plans for the pilot programmes - ; and other matters, 5) Equipment needed for the pilot studies – 6) Review of the main IOTTP. The IOTTP slide show is also included. |
| Tipo: Working Paper |
Palavras-chave: Tagging; Tuna fisheries; Marking; Stock assessment. |
| Ano: 2001 |
URL: http://hdl.handle.net/1834/121 |
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| Gasceul, D.; Laurans, M.; Sidibe, A.; Barry, M.D.. |
| This communication presents a synthesis of the work undertaken within the framework of the FIAS project, by the “Single-species Analysis” module. This work focuses on statistical analyses of commercial fishing and the data from scientific trawling surveys, in order to deduce the current state of exploited stocks and to better understand the ecosystems of the sub-region. This relates to the analyses of about 20 stocks, distributed in the waters of the various countries and covering a broad range of ecological characteristics. Three approaches were used: (1) analyses of a time series of estimates of abundance indices obtained from GLM-type methods applied to survey or commercial data; analysis of a time series of catches and catches per unit of effort used... |
| Tipo: Conference Material |
Palavras-chave: Demersal fisheries; Stock assessment. |
| Ano: 2002 |
URL: http://hdl.handle.net/1834/689 |
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| Adam, Adel Mohamed Saleh. |
| The present study deals with the fisheries of two Sparid fish species in Abu Qir Bay. Family Sparidae represents about 17 % of the landed catch from the Bay. Among the family; genus Diplodus is generally caught by trammel nets, beach and purse seines but mostly by longlines. Two species of this genus were considered here for study. They are namely D. sargus and D. vulgaris where they represent by about 4.2% of the landed catch during the year 2008 in the Bay (GAFRD, 2008). The length weight relationship of both species under study showed a value of exponent “b” of very slight negative allometry. Analysis of the catch length structure of the two species revealed that the catch of D. sargus is composed of 21 length groups, the least length was 7.5 cm and the... |
| Tipo: Theses and Dissertations |
Palavras-chave: Stock assessment. |
| Ano: 2010 |
URL: http://hdl.handle.net/1834/5091 |
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| Registros recuperados: 173 | |
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