Dietary Identification from Stomach Contents of Scatophagus argus (Linnaeus, 1766) in Songkhla Lagoon Based on Index of Relative Importance
Keywords:
Scatophagus argus, benthos, stomach content, IRI, Songkhla lagoonAbstract
Spotted scat (Scatophagus argus Linnaeus, 1766) is an economic fish for the local fishermen in Songkhla lagoon. The aim of this study would like to identify food and analyze the index of relative important (IRI) from stomach content, in order to food development in future. Fish were collected form the culture trap in the outer Songkhla lagoon during January to March 2018. There were 34 stomachs from fish with average of body length 15.96±0.93 cm. The result revealed that crustacean, polychaete, mollusk, algae and fish egg were found in the fish stomach. IRI analysis indicated that mollusk showed the highest IRI value (IRI=7,305.59) followed by crustacean (IRI=4,473.26) and polychaete (IRI=166.46), respectively. Bivalve was more important than gastropod (IRI=5,955.60 and 451.33, respectively) for the mollusk. Bradleycypis oblique (ostracod) was the most important for the crustacean (IRI=507.01) and then G. magnae (IRI=282.58) and Cheirriphotis sp. (IRI=277.61), respectively for the amphipod group. Also, Neanthes sp. had higher important than Phyllodace sp. (IRI=17.75, 3.29) for the polychaete group.
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