Catch and effort data used in the assessment of herring populations in the southern Gulf of St. Lawrence PDF Download
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Category :
Languages : en
Pages : 28
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Author:
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Category :
Languages : en
Pages : 28
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Author:
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Category :
Languages : en
Pages : 0
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RÉSUMÉ Les données sur les prises et l'effort de la pêche aux filets maillants ont été analysées afin d'établir des séries de données sur les taux de prise des composantes des géniteurs de printemps et des géniteurs d'automne du hareng dans le sud du golfe du Saint-Laurent. [...] For both the spring and the fall population Pour établir les estimations de population du printemps estimates, only a subset of data from the et de l'automne, on a uniquement utilisé un southern Gulf (based on statistical districts sous-ensemble de données sur le sud du golfe (établi comprising the majority of gillnet landings in selon les districts statistiques comprenant la majorité the fall and [...] The proportion of total 4T spring données concernant l'ensemble de 4T dans la série de landings accounted for in these areas has données sur les taux de prise des géniteurs de been fairly stable, between 64% and 71%, printemps plutôt que les données sur les trois zones from 1990 to 2001. [...] As for the fall CPUE calculations, the daily Pour ce qui est du calcul des PUE de l'automne, les catch and number of fishing trips were prises quotidiennes et le nombre de sorties de pêche aggregated by day. [...] Various combinations of data and model On a mis à l'essai diverses combinaisons de données et formulations were tried in an attempt to find a de formulations de modèle en vue de déterminer l'indice CPUE index which was more representative de PUE le plus représentatif de l'abondance du hareng of the abundance of spring herring.
Author: Shoukry N. Messieh
Publisher:
ISBN:
Category :
Languages : en
Pages : 17
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"Data on fishing effort and catch-per-unit effort for the inshore herring fisheries in the southern Gulf of St. Lawrence in 1973 through 1980 are presented. These data were compiled from all purchase slip records available in the public archives."--Abstract.
Author: Caroline LeBlanc
Publisher:
ISBN:
Category :
Languages : en
Pages : 29
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"This document was part of the information presented at a regional peer review of the assessment framework for the fall spawning component of Atlantic herring in the southern Gulf of St. Lawrence (sGSL) (NAFO Div. 4T). The stock area for the sGSL Atlantic herring extends from the north shore of the Gaspe Peninsula (Quebec) to the northern tip of Cape Breton Island (Nova Scotia) and includes the Magdalen Islands. The two seasonal herring spawning components that are assessed for the sGSL are spring spawners and fall spawners. SGSL herring are harvested by an inshore gillnet fleet fishing in coastal waters and a purse seine fleet of a maximum of 12 seiners (>65') fishing in deeper water. Since 1999, fall spawners have comprised 70% or more of the total catch in the sGSL. Market conditions have played a large role in determining catch levels in this fishery. There are approximately 3,000 herring bait licenses for personal use in the sGSL. In 2012 and 2013, there was an average of 712 actively fishing gillnet commercial licenses out of a possible total of 2,590 license holders. The assessment for each herring component currently provides a F0.1 fishing level calculation. Gillnet catch-per-unit-effort (CPUE) and acoustic survey indices were used to calibrate the population models. Spawning stock biomass reference points consistent with the Precautionary Approach were derived for both spawning components in 2005. The latest assessment of the sGSL herring stocks in 2013 showed pathological problems including blocks of residuals and large retrospective patterns when fitting the current population model. Similar problems were encountered in past assessments of the sGSL herring stocks"--Abstract.
Author: Messieh, S. N. (Shoukry N.)
Publisher: [Dartmouth, N.S.] : Canadian Atlantic Fisheries Scientific Advisory Committee
ISBN:
Category :
Languages : en
Pages : 34
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Author:
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Category :
Languages : en
Pages : 19
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Assessment of herring stocks in the southern Gulf of St. Lawrence (NAFO Division 4T) requires a reliable indicator of trends in stock abundance. Recent assessments have used abundance indices based on gillnet catch rates, estimated from landings data from purchase slips and effort data obtained through telephone surveys. Because of difficulties in interpreting catch rates derived from purchase slips, alternate methods are being developed and tested, including acoustic surveys, spawning bed surveys, subjective evaluations by fishermen, and the index fisherman program. In the index fishermen program, catch rates are obtained directly from selected gillnet fishermen through telephone interviews conducted during the fishing season. This paper presents results of the first 2 years of index fishermen data, and evaluates the program's usefulness as an indicator of herring abundance.
Author:
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ISBN:
Category : Fish-culture
Languages : en
Pages : 564
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Category : Aquatic sciences
Languages : en
Pages : 818
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Author: Gordon H. Kruse
Publisher: Alaska Sea Grant College Program
ISBN:
Category : Science
Languages : en
Pages : 744
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This proceedings represents worldwide expertise in spatial features of marine population dynamics and spatial applications in fisheries management. Thirty-five peer-reviewed articles feature cutting edge spatial research in analytical tools, modeling, life history patterns, distribution, physical environment, species interactions, fisheries patterns, and marine protected areas. Proceedings of the 17th Wakefield Fisheries Symposium, 1999, Anchorage, Alaska.
Author: Lynn Cleary
Publisher:
ISBN:
Category :
Languages : en
Pages : 30
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