TERTIARY FISHES FEEDING HABIT IN A TROPICAL ESTUARY IN BRAZIL
DOI:
https://doi.org/10.65259/rnzool.v7i2.67Keywords:
Fishes, stomach content, terciary consumersAbstract
The feeding habits of tertiary consuming fish was studied, aiming at to contribute for the knowledge of the ichthyofauna food web in the Santa Cruz Channel (SCC), Itamaracá, Pernambuco, Brazil. Samples were collected monthly in the SCC with a trawl net type, from 1995 to 1998. Also, data published since 1979 on fishes feeding habits in the area was used to complement the research. After the collections, samples were fixed with formaldehyde at 10%. In laboratory, the stomachs were taken out and preserved in formaldehyde at 4%. In the SCC occurred nearly 160 species, distributed in 2 classes, 60 families and 109 genera, being the consumers of third order represented by the species: Centropomus parallelus, C. undecimalis, Scomberomorus brasiliensis and Sphyraena barracuda. Among these species the most abundant were C. parallelus and C. undecimalis. The specie Centropomus parallelus presented the dominance of Crustacea (51%) followed by Teleostei (36%). C. undecimalis presented the dominance of Teleostei (58%) followed by Crustacea (31%). Scomberomorus brasiliensis and Sphyraena barracuda presented the dominance of Teleostei, with 74% and 62%, respectively. It can be concluded that the abundance of fish, crustaceans and mollusks in stomach contents showed the ability of trophic support of the SCC allowing the establishment of third order fish consumers. The function of tertiary consumers as top consumer in the trophic web, as well as its migration to surrounding ecosystems is a strong argument for the conservation of coastal areas of Pernambuco State.
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