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The effects of seasonal variation on the nutritional condition of Nephrops norvegicus (Astacidea: Nephropidae) from wild populations in the western Mediterranean

Published online by Cambridge University Press:  14 February 2014

Guiomar Rotllant ,
Joan B. Company ,
Inmaculada Alvarez-Fernández ,
José A. García ,
Jacopo Aguzzi  and
Mercè Durfort
Guiomar Rotllant*
Affiliation:
Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (ICM-CSIC), Passeig Marítim de la Barceloneta 36-49, 08003 Barcelona, Spain IRTA, Ctra. Poble Nou, Km. 5.5, 43540. Sant Carles de la Ràpita (Tarragona), Spain
Joan B. Company
Affiliation:
Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (ICM-CSIC), Passeig Marítim de la Barceloneta 36-49, 08003 Barcelona, Spain
Inmaculada Alvarez-Fernández
Affiliation:
Grupo de Recursos Marinos y Pesquerías, Universidad de A Coruña, Rúa da Fraga 10, 15008 A Coruña, Spain
José A. García
Affiliation:
Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (ICM-CSIC), Passeig Marítim de la Barceloneta 36-49, 08003 Barcelona, Spain
Jacopo Aguzzi
Affiliation:
Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (ICM-CSIC), Passeig Marítim de la Barceloneta 36-49, 08003 Barcelona, Spain
Mercè Durfort
Affiliation:
Departament de Biologia Cel·lular, Facultad de Biologia, Universitat de Barcelona, Avenida Diagonal, 643, 08028 Barcelona, Spain
*
Correspondence should be addressed to: G. Rotllant, Institut de Ciències del Mar, Consejo Superior de Investigaciones Científicas (ICM-CSIC), Passeig Marítim de la Barceloneta 36-49, 08003 Barcelona, Spain email: [email protected]
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Abstract

The Norway lobster, Nephrops norvegicus is a target fishery species in European waters. The stock assessment of N. norvegicus is complicated because it is caught in commercial gear only when it emerges from its burrow. Landings are lower in winter, and feeding limitations have been hypothesized as the cause. Wild large-sized male lobsters were sampled each season (winter, spring, summer and autumn), and two groups of animals were kept in captivity for 90 d (fed and food-deprived). The hepatopancreas and muscle were dissected, weighted, frozen for biochemical analyses (proximal analyses and DNA/RNA) and fixed in Bouin solution for microscopic observations. The oxygen consumption rates in the wild individuals caught in the spring and in the captive animals after the treatments were measured. Significant differences among the experimental groups were observed in the lipid concentration of the hepatopancreas and muscle, the water content in the hepatopancreas, and the numbers of vacuoles and pyknotic nuclei in the cells of the tubules of the hepatopancreas. The results showed that the wild Norway lobsters generally presented intermediate values between those observed in the food-deprived and the fed lobsters kept in captivity, but the values were closer to those obtained for the fed animals. This finding indicates that the wild animals exhibit a good nutritional condition throughout the year. Therefore, the wild males of N. norvegicus do not face food deprivation during winter as is suggested by the pattern of commercial catches, the flow of organic matter, and the moulting period/reproductive behaviour of the species.

Keywords

Nephropsfeedingfood deprivationannual cyclenutritional condition indicesbiochemical compositiontissue morphologyRNA/DNAoxygen consumptionfisheries management
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 94 , Issue 4 , June 2014 , pp. 763 - 773
Copyright
Copyright © Marine Biological Association of the United Kingdom 2014 

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