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Ontogenetic dietary shifts and morphological correlates in striped mullet, Mugil cephalus

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Ontogenetic dietary shifts are well studied in fishes. However, these shifts are rarely correlated with habitat and morphology. This study investigates: (1) ontogenetic dietary changes in mullet; and if dietary shifts do occur (2) whether they are correlated with feeding location, feeding behavior and/or feeding morphology. Stomach contents from eight size classes, each with 25 individuals, were analyzed using a gravimetric sieve fractionation procedure, Czechanowski's Quantitative Index and cluster analysis. Core samples (5 mm deep) were also analyzed in the same manner. Morphological characters were measured to detect differences among the size classes. Cluster analysis showed three distinct trophic units for Mugil cephalus in Cross Bayou: (1) 20.0 mm standard length — 30.0 mm SL; (2) 30.0 mm SL — 40.0 mm SL; and (3) 40.0 mm SL — > 100 mm SL. Comparison of the gut contents to the sediment contents for each size class showed an increase in similarity as the fish grew. Mullet gut contents from fish 20–25 mm SL were only 45% similar based on the weights of the prey items to the sediment subsample prey items, while stomach contents from fish > 100 mm SL were 84% similar to the sediment subsample contents. Gill raker length and interraker spacing of four gill arches were allometric with respect to standard length. Prey particle size within size classes appeared to be more correlated with feeding behavior than gill interraker spacing because smaller particles than predicted by the interraker spacing were ingested. It is suggested that smaller fish may be browsing more selectively than larger fish which graze.

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  1. Bradley T. Eggold

    Present address: Wisconsin Department of Natural Resources, P. O. Box 408, Plymouth, Wisconsin, 53073, U.S.A.

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  1. Department of Biology, University of South Florida, Tampa, FL, 33620, U.S.A.

    Bradley T. Eggold & Philip J. Motta

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Eggold, B.T., Motta, P.J. Ontogenetic dietary shifts and morphological correlates in striped mullet, Mugil cephalus . Environ Biol Fish 34, 139–158 (1992). https://doi.org/10.1007/BF00002390

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