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Stomach contents of the catfishes Osteogeneiosus militaris (Linnaeus, 1758) and Arius maculatus (Thunberg, 1792) in the Songkhla Lake

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Author(s): Angsupanich, S. | Somsak, S., | Phrommoon, J.

Journal: Songklanakarin Journal of Science and Technology
ISSN 0125-3395

Volume: 27;
Issue: Suppl.1;
Start page: 391;
Date: 2005;
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Keywords: stomach contents | Songkhla Lake | Osteogeneiosus militaris | Arius maculatus

ABSTRACT
The catfishes, Osteogeneiosus militaris and Arius maculatus, were collected from Songkhla Lake, southern Thailand at two sites that varied in the extent to which they were exposed to higher salinity (the Outer Songkhla Lake) and which were exposed to lower salinity (the Inner Songkhla Lake). Both fish species were carnivores feeding mainly on benthic invertebrates with regard to its major components of Tanaidacea, Amphipoda, Bivalvia, Polychaeta and Isopoda. Tanaidacean (Apseudes sapensis) clearly dominated the diets of O. militaris in both sites ranging from 33.3 to 96.7% by frequency of occurrence and 23.5 to 90.2% by number. Amphipods were the most dominant prey of A. maculatus ranging from 40.0 to 93.3% by frequency of occurrence and 7.0-60.2% by number. Although Polychaeta were less numerically abundantly eaten by catfishes (0.4-6.4%), the frequency of occurrence was high (10.0-86.7%) in almost all seasons. Some other large (Alpheidae and fish larvae) and fast mobile animals (Mysidacea) were much more commonly found in A. maculatus than in O. militaris. This study implies that these catfish species feed opportunistically on a variety of prey in their environment coupled with preferential feeding.

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