Estudios sobre la dieta en piqueros como indicadores de la estructura por tallas de los stocks de Anchoveta en el mar peruano

Jaime Jahncke; Domenica Zileri

Authors

Jaime Jahncke Instituto del Mar del Perú
Domenica Zileri Instituto del Mar del Perú

Keywords:

Seabirds, Sula variegata, Engraulis ringens, Peruvian Anchovy, industrial fishery

Abstract

Anchovy sizes preyed by Peruvian Boobies Sula variegata were compared with those captured by the industrial fishery. Comparisons were done using general data from total landings and more precise data from fishing boats working near the studied islands. The aim of this work is to demonstrate that Peruvian Boobies diet can provide information about the size structure of the fish prey stock. Results show that there were not significant differences between anchovy sizes preyed by boobies and sizes captured by the fishery in 92,86% of comparisons made with landings and in 85,71% of comparisons made with fishing boats. Similarity indexes were higher than 0,60 in 78,57% of the comparisons made with landings (n=28) and in 85,71% of comparisons made with fishing boats (n=7). Correlation was higher than 0,70 in 75% of comparisons made with landings and in 71,43% of comparisons made with fishing boats. Values of 0,70 are similar to determination coefficient values of 0,50; which indicate that 50% of variation is due to boobies or fishery inherent factors. We must consider that there is a range in depths where the industrial fishery can
capture anchovy not available for the boobies and also that boobies can feed on small anchovy schools that may not be of interest for the fishery; these could be some factors responsible of the variation. Obtained results show that Peruvian Boobies diet studies are useful in the permanent monitoring of the anchovy stock size structure. These studies can provide information even during the anchovy fishing closed season when data is not available.

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