The present investigation included diet composition and feeding habits of sin croaker (Johnius dussumieri) based on the monthly examination of 1031 specimens along Ratnagiri coast of India from December 2009 to November 2011. Results indicate that J. dussumieri is a carnivore feeder and feeds upon narrow range of food items. Crustaceans were identified as most dominant food items followed by teleost fishes, molluscs and planktonic forms like fish egg and Salpa. The species preferably feeds on a marine crustacean i.e. Acetes spp. The feeding intensity of J. dussumieri was found poor during April and September. The analysis of Kendell’s coefficient of concordance indicated relatively stronger association (W = 0.64, p < 0.05) of choice of food items with season, while the same did not hold good for different size groups. Therefore, the differential feeding habit was evident among the different size groups. The juveniles preferably feed on crustaceans, while the adults were observed to prefer small teleost fishes. The differences in the diet composition between adults and juveniles indicated the existence of different feeding habitats along the Ratnagiri coast of India.

中文翻译：

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印度拉特纳吉里海岸的Johnius dussumieri（Cuvier，1830）的饮食组成和喂养策略

根据2009年12月至2011年11月印度拉特纳吉里海岸沿月对1031个标本进行的每月检查，本次调查包括了鱼（Johnius dussumieri）的饮食组成和喂养习惯。结果表明，J。dussumieri是食肉动物，在狭窄的地方进食。食品种类繁多。甲壳类被认为是最主要的食物，其次是硬骨鱼，软体动物和浮游形式，例如鱼卵和萨尔帕。该物种优选以海生甲壳类即醋栗属为食。在4月和9月期间，发现J. dussumieri的进食强度较差。肯德尔一致性系数的分析表明关联性相对较强（W = 0.64，p<0.05）随季节选择的食物种类，而相同的食物对不同大小的人群没有好处。因此，不同大小组之间的喂养习惯差异明显。幼鱼最好以甲壳类为食，而成年人则喜欢小型硬骨鱼。成年和少年之间饮食结构的差异表明，印度拉特纳吉里海岸沿线存在着不同的觅食栖息地。