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Comparisons of Catch and Precision of Pop Nets, Push Nets, and Seines for Sampling Larval and Juvenile Yellow Perch

Paradis, Y. et Mingelbier, M. et Brodeur, P. et Magnan, P. (2008). Comparisons of Catch and Precision of Pop Nets, Push Nets, and Seines for Sampling Larval and Juvenile Yellow Perch. North American Journal of Fisheries Management , 28 (5). p. 1554-1562. DOI: 10.1577/M07-122.1.

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Résumé

Abundance estimates of larval and juvenile fish require unbiased and precise sampling techniques. Even if an appropriate sampling technique is chosen, fish abundance estimates can be inaccurate if there is no assessment of the gear precision. Our first objective was to compare catch characteristics of pop nets, push nets, and seines for sampling occurrence, abundance, and size of age-0 yellow perch Perca flavescens in shallow habitats with different vegetation densities. The second objective was to estimate the precision (coefficient of variation [CV]) with which each sampling gear measured larval and juvenile yellow perch abundance. Larval fish were collected in May 2003 via pop nets and push nets, and juveniles were collected in July 2003 via pop nets and seines. Significant differences in yellow perch occurrence and abundance were observed between sampling gears and sampling periods. May occurrence and abundance of larval yellow perch were higher for push nets than for pop nets in open-water habitats but were the same in vegetated sites. The seine was the most effective gear for sampling juvenile yellow perch in both sparsely and densely vegetated habitats during July. The average total length of larval yellow perch sampled with pop nets in May was significantly higher than that of fish sampled with push nets. Average total length of juvenile yellow perch in July was significantly higher for seine samples than for pop-net samples. Our results showed that (1) high precision levels can be reached with pop nets and push nets during May sampling of yellow perch larval stages but (2) the precision level is lower in July when pop nets and seines are used to sample juvenile stages. The CV suggests that aggregations of age-0 yellow perch increased between May and July, which has important implications for sampling design.

Type de document: Article scientifique
Statut du texte intégral: Autre
Mots-clés libres: Larval, Fish, Sampling technique, Yellow perch, Perca flavescens, Habitats
Sujets: 1. Laboratoire de développement durable > 1.7. Environnement, écologie, écosystème
2. Milieu physique > 2.4. Hydrologie
4. Faune > 4.2. Poisson
8. Impacts et monitoring > 8.4. Population de perchaude
Date de dépôt: 08 avr. 2017 13:46
Dernière modification: 08 avr. 2017 13:46
URI: http://belsp.uqtr.ca/id/eprint/1089

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