Feeding characteristics of Neogobis caspius in the south west coastline of the Caspian Sea (Gilan Province)

  Neogobius caspius is an endemic species of the Caspian Sea which plays an important role in food chain as a predatory fish. The main aim of this study was to investigate selected feeding characteristics of Neogobius caspius in the south west coasts of the Caspian Sea. Monthly sampling was carried out using a bottom trawler at three stations (Astara, Anzali and Chabuksar) in three depths (۰-۵, ۵-۱۰ and ۱۰-۱۵m) on a monthly basis from October ۲۰۰۴ to September ۲۰۰۵. Relative gut length (RLG) was less than one suggesting that this species is carnivorous. RLG was significantly lower in older fish but gut length was longer (P<۰.۰۵). I ntensity of fullness was below the favorite degree (IF<۴۰۰) from October to March, however, it was higher (۴۰۰caspius mainly fed on molluscs (Food preference, FP=۱۰۰%), worms (FP=۸۹%) and crustaceans (FP=۷۴%), hence, this species is considered as euryphagus species.

کلیدواژه ها:

caspius ، Feeding characteristics ، Relative gut length ، Food preference ، Caspian Sea ، Iran