Data/hora: 06/06/2024 04:25:38

Provedor de dados: | 5
País: | France

Título:

Changements ontogéniques de la condition larvaire chez une espèce de poisson à reproduction hivernale, le hareng des Downs

Ontogenetic shift in the larval condition of Downs herring, a winter spawning fish

Autores: | Denis, Jeremy.
Data: | 2016-12-13
Ano: | 2016
Palavras-chave: | Hareng des Downs; Condition larvaire; Nutrition; Croissance; Période critique; Manche-mer du Nord.; Downs herring; Larval condition; Feeding strategy; Growth; Critical period; English Channel-North Sea.
Resumo: | The larval condition of Downs herring during the critical period was investigated between 2008 and 2015 in the eastern English Channel and Southern Bight of North Sea from data collected during the International Bottom Trawl Survey (IBTS). First, the study of the feeding strategy from gut contents analysis using two complementary approaches (electronical microscopy and measure of fluorescence) revealed a shift in the feeding diet occurring at a larval size of 13 mm. Smaller larvae had an omnivorous and a more diversified diet composed of numerous protist and small zooplanktonic preys whereas bigger larvae had a less diversified diet composed mainly of bigger zooplanktonic prey. Along with the diet shift, combination of four condition indices (ingestion rate, RNA/DNA and DNA/C ratios and otoliths) also revealed important changes in the nutritional status and growth of these larvae. Larvae smaller than 13 mm had a sustainable nutrition and growth whereas larger larvae depicted low growth rate. This could reflect a change in the energy-allocation strategy from a growth-oriented strategy towards a more storage-oriented strategy. These ontogenetic changes in the larval condition suggest that the diet shift occurring at 13 mm could constitute the core of the critical period for Downs herring larvae.
Tipo: | Text
Idioma: | Francês

Identificador:

http://archimer.ifremer.fr/doc/00386/49701/50227.pdf

http://archimer.ifremer.fr/doc/00386/49701/

Editor: | Université du Littoral Côte d'Opale
Formato: | application/pdf

Fonte:

2016 ULCO

info:eu-repo/semantics/openAccess

restricted use