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Your search keyword '"Pawlowski, Lionel"' showing total 4 results
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4 results on '"Pawlowski, Lionel"'

1. Benchmark Workshop on selected stocks in the Western Waters in 2021 (WKWEST)

Author

Pennino, María Gracia, Ball, Jonathan, Bouch, Paul, Campbell, Neil, Duhamel, Erwan, Larivain, Ángela, Maia, Catarina, Moore, Claire, Nash, Richard, Ourens, Rosana, Pawlowski, Lionel, Ramírez, John Gabriel, Rocha, Alberto, van der Kooij, Jeroen, Mathieu Lundy, Arved Staby, Quinzán, M. (Marta), González-Troncoso, D. (Diana), and Stötera, Sven

Subjects
Pesquerías, Centro Oceanográfico de Cádiz, stock assessment
Abstract

The goal of a benchmark is consensus agreement on an assessment methodology that is to be used in future update assessments. This assessment methodology can be an analytical assessment, but can also be non-analytical, for instance based on trends in an assessment or in a selected set of (survey) indicators, with or without forecasts. The result will be the 'best available' method that ICES advice will be based on. WKWEST 2021 dealt with the following stocks: Sardine (Sardina pilchardus) in Subarea 7 (southern Celtic Seas, and the English Channel); Pollack (Pollachius pollachius) in subareas 6-7 (Celtic Seas and the English Channel); Red gurnard (Chelidonichthys cuculus) in subareas 3–8 (Northeast Atlantic); Plaice (Pleuronectes platessa) in divisions 7.h–k (Celtic Sea South, southwest of Ireland); Sole (Solea solea) in divisions 8.c and 9.a (Cantabrian Sea and Atlantic Iberian waters).

Published
2021

2. Report of the Working Group on the Biology and Assessment of Deep-sea Fisheries Resources

Author

ICES, Aleksandrov, Dmitriy, Bergstad, Odd Aksel, Blasdale, Tom, Díez, Guzmán, Dransfeld, Leonie, Elvarsson, Bjarki Thor, Figueiredo, Ivone, Guijarro-García, Elena, Hallfredsson, Elvar Halldor, Hansen, Hege Overbo, Helle, Kristin, Gil, Juan, Jakobsdottir, Klara, Lorance, Pascal, Martínez, Íñigo, Ofstad, Lise Helen, Pawlowski, Lionel, Rilho-de-Pinho, Mário Rui, and Thordarson, Gudmundur

Subjects
Centro Oceanográfico de Vigo, deep sea fisheries, North Atlantic, Pesquerías, stock assessment
Published
2014

3. Integration of discards in the roundnose grenadier stock assessment in ICES division Vb, subaera VI, VII

Author

Pawlowski, Lionel and Lorance, Pascal

Subjects
deep fishing, roundnose grenadier, abundance, abondance, rejets, évaluation de la ressource, grenadier de roche, pêche profonde, discards, stock assessment
Abstract

We present a series of exploratory stock assessments for roundnose grenadier (Coryphaenoides rupestris) from estimates of catch data based on information and assumption of discards and landing statistics. It is a common practice to consider landings data as a substitute of catch data to perform stock assessments. When a significant portion of the catch is discarded, this assumption is likely to be misleading as assessment methods will provide underestimated stock size., Une série d'évaluations de stock exploratoires pour le grenadier de roche (Coryphaenoides rupestris) a été réalisée à partir d'estimations de capture basées sur l'évaluation des rejets et sur les statistiques des débarquements. Pour les évaluations de stock, il est courant de considérer que les données des débarquements correspondent aux données des captures. Mais lorsqu'une portion significative de la capture est rejetée, il est alors fort probable que les méthodes de travail donneront des résultats faussés et que la taille du stock sera sous-estimée.

Published
2008

4. Effect of discards on roundnose grenadier stock assessment in the Northeast Atlantic.

Author

Pawlowski, Lionel and Lorance, Pascal

Subjects
*AQUATIC animals, *ECOSYSTEM management, *FISHERY management, *HABITATS, *ROUNDNOSE grenadier, *GEOGRAPHICAL distribution of fishes
Abstract

In the Northeast Atlantic fishery for roundnose grenadier Coryphaenoides rupestris, discards account for about 30% of the catch in weight. Data on discards are scarce; however, length distributions and discard rates appear to be relatively stable from year to year. In contrast, landings data available since 1990 show that the average pre-anal fin length has decreased from 20.7 cm in 1990 to 15.2 cm in 2008, resulting in a 58% reduction of the mean individual weight (850 g in 2008) and an increasing occurrence of overlapping class sizes between landings and discards in recent years. For stock assessment, the method of separable virtual population analysis (SVPA) was used. However, because of the lack of discard data for many of the years covered by the study, the catch data used as input to the assessment model had to be reconstructed from the available information (landings, discards, fishing effort and bathymetric distribution of the stock) using two methods. The first method relied on the assumption that the recent length distributions of discards were applicable to the earlier years (1990-1997). It resulted in unrealistic bimodal length distributions, suggesting a change in discarding practices through time, with larger individuals being discarded in the early days. The second method, based on the fishing effort and length distribution by depth strata, produced unimodal distributions for the whole period and confirmed that the average length of discarded fish was higher in the early days of the fishery. In both cases, the estimates of biomass follow parallel trends, suggesting a strong decline in the population. The available information and methods are discussed. [ABSTRACT FROM AUTHOR]

Published
2009
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