Evidence of a variable 'unsampled' pelagic fish biomass in shallow water (< 20 m): the case of the Gulf of Lion
| Autor: | Bernard Liorzou, Jean-Louis Bigot, Yvon Guennegan, Patrice Brehmer, Jean Guillard |
|---|---|
| Přispěvatelé: | Centre de Recherche Halieutique Méditerranéenne et Tropicale (CRHMT), Université Montpellier 2 - Sciences et Techniques (UM2)-Institut Français de Recherche pour l'Exploitation de la Mer (IFREMER), Centre Alpin de Recherche sur les Réseaux Trophiques et Ecosystèmes Limniques (CARRTEL), Institut National de la Recherche Agronomique (INRA)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry]), Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Institut National de la Recherche Agronomique (INRA) |
| Jazyk: | angličtina |
| Rok vydání: | 2006 |
| Předmět: |
0106 biological sciences
assessment Fishing Population Coastal fish Small pelagic fish Assessment Aquatic Science Oceanography 01 natural sciences Spatial distribution 14. Life underwater education Transect Ecology Evolution Behavior and Systematics Biomass (ecology) geography education.field_of_study geography.geographical_feature_category hydroacoustic methods Hydroacoustic methods Ecology spatial distribution Continental shelf 010604 marine biology & hydrobiology Shallow water small pelagic fish shallow water Pelagic zone 04 agricultural and veterinary sciences Fishery Waves and shallow water [SDE]Environmental Sciences 040102 fisheries 0401 agriculture forestry and fisheries Environmental science |
| Zdroj: | ICES Journal of Marine Science ICES Journal of Marine Science, Oxford University Press (OUP), 2006, 63 (3), pp.444-451. ⟨10.1016/j.icesjms.2005.10.016⟩ ICES Journal of Marine Science (1054-3139) (Elsevier), 2006-04, Vol. 63, N. 3, P. 444-451 |
| ISSN: | 1054-3139 1095-9289 |
| DOI: | 10.1016/j.icesjms.2005.10.016⟩ |
| Popis: | Studies of small pelagic fish biomass are limited by the fact that research vessels and fishing boats are usually restricted to working areas with a bottom depth >20 m. Consequently, “unsampled” areas can represent a large proportion of the continental shelf, and the biomass in those areas can be important and must be taken into account in assessment methods in order to avoid misleading interpretations in population dynamics. A time-series ten years long has been compiled from acoustic-assessment surveys of small pelagic fish stocks, and the results show an overall increase in the acoustic fish density towards the coast, where values were the highest. Additional experiments on transects covering shallow-water areas (5–20 m) were conducted from 2001 to 2003 with small boats and a research vessel to evaluate the acoustic fish density in those areas. The results confirmed that the fish biomass in shallow water is significant, sometimes very large, and should be evaluated to avoid underestimation. Therefore, surveys should be conducted in shallow water, if at all possible, as well as at greater depths when carrying out surveys destined to support assessment exercises. |
| Databáze: | OpenAIRE |
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