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Zoological Research
Kunming Institute of Zoology, Chinese Academy of Sciences
ISSN: 2095-8137
Vol. 34, No. 5, 2013, pp. 493-498
Bioline Code: zr13077
Full paper language: English
Document type: Report
Document available free of charge

Zoological Research, Vol. 34, No. 5, 2013, pp. 493-498

 en Diet composition and transition of clearhead icefish( Protosalanx hyalocranius check for this species in other resources )in Lake Xingkai
TANG, Fu-Jiang; LIU, Wei; WANG, Ji-Long; LI, Zhe & XIE, Song-Guang

Abstract

Diet compositions of alien clearhead icefish( Protosalanx hyalocranius check for this species in other resources )in Lake Xingkai were investigated monthly from June 2010 through January 2011. Protosalanx hyalocranius preyed mainly on cladoceran, copepoda, shrimp, and larvae or juvenile fish. In June, P. Hyalocranius were smaller than 60 mm standard length(SL), and their diets were composed of zooplankton only. In July, fish began to appear infrequently in the diet of P. Hyalocranius larger than 60 mm SL, and by August fish was occurring in the diets of P. hyalocranius larger than 80 mm, 100 mm in September, and 120 mm in October and thereafter, respectively. The increase in the minimum SL of P. hyalocranius preying on fish within a given season reflects changes in resource availability, largely attributed to the corresponding increase in prey fish size as seasons progress. Protosalanx hyalocranius and Hemiculter check for this species in other resources sp. were the dominant prey fish in the diets of P. hyalocranius.

Keywords
Lake Xingkai; Protosalanx hyalocranius; Diet transition; Cannibalism

 
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