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| Rosecchi, E; Nouaze, Y. |
| Compound indices are often used in the analysis of fish stomach contents to characterize diet. Five of these indices, combining two or three measures of prey importance: weight, abundance and frequency of occurrence, are mathematically compared in this work. Data from a feeding study of sparid fish show that different indices can produce different results. Four classifications of food, in terms of preferences, are applied to Sparidae, compared and discussed. A new method of classifying the prey of fish into groups is proposed. It characterizes the main items in the diet, whatever feeding index is chosen for the analysis. |
| Tipo: Text |
Palavras-chave: Quantitative distribution; Weight; Predation; Stomach content; Feeding. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/publication-1773.pdf |
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| Rosecchi, E. |
| The four Sparidae studied are coastal species that regularly enter the Mediterranean coastal salt lagoons. Changes in diet with regard to size class of fish, and occasionally season, are detailed. For each species, diets in the sea and in the lagoons are compared using several methods and show differences. Individuals from lagoons do not eat, or in very low numbers, mollusks, echinoderms and decapods. However, as their feeding is very rich and diverse, sparid fishes can probably find in the lagoons, whatever their age, the prey necessary to their growth. Trophic factors cannot explain age structure in lagoons and the absence of some age classes. |
| Tipo: Text |
Palavras-chave: Pisces; Sparidae; Trophic levels; Age composition; Predation. |
| Ano: 1985 |
URL: http://archimer.ifremer.fr/doc/1985/publication-1774.pdf |
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