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Preliminary Observations on the Feeding Activity of Fishes during Tidal and Diel Cycles in the Loire Estuary: The Bib Trisopterus luscus L. 1758
Author(s) -
ROBIN J. P.,
MARCHAND J.
Publication year - 1986
Publication title -
marine ecology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.668
H-Index - 58
eISSN - 1439-0485
pISSN - 0173-9565
DOI - 10.1111/j.1439-0485.1986.tb00155.x
Subject(s) - diel vertical migration , shrimp , predation , fishery , estuary , biology , population , predator , zoology , environmental science , oceanography , ecology , demography , sociology , geology
Abstract. .Series of experimental trawls repeated over the same area during both 12 and 24 h cycles coupled with an analysis of the stomach contents of the bib demonstrated quantitative and qualitative variations in the predator's diet. The population studied feeds continuously over 24 h, the coefficient of “fullness” is relatively constant, and freshly eaten prey can be observed both during the day and at night. The proportion of brown shrimp in the food increases after high tide, especially when this occurs at night, coinciding with the shrimp's period of maximum activity. However, the overall impact of the bib on the shrimp population depends more on the abundance of the former than on variations in their individual food intake.