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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 1, No. 2, 2004, pp. 89-95
Bioline Code: st04011
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 1, No. 2, 2004, pp. 89-95

 en Dietary overlap between invasion ctenophora (M . leidyi ) and anchovy (C. engrauliformis) in the southern parts of Caspian Sea
F. Darvishi, A. Esmaili Sari and P. Farshchi

Abstract

Mnemiopsis leidyi check for this species in other resources , native to America, Invaded the Caspian Sea in 1999. By the end of 2000, the entire sea was accupied with them. In parallel, a sharp decline in pelagic fish such accurrred.This survey was studied the relationship between the M. leidyi and this decline. Dietary analysis was conducted on anchovy sprat ( Clupeonnela engrauliformis check for this species in other resources ) and M. leidyi from August 2001 to October 2002 in the coastal water in the southern parts of Caspian Sea, in Iran. M. leidyi was caught by plankton net, (the mesh size ~5 mm), at three depth at 5, 10 and 15 m . Sprat was caught by fisheries boat at Babolasar fishery harbor. Samples were not fixed in M. leidyi common fixative, 96% Ethanol were used. The Schoener index analysis reflected a similar diet composition of both species, with an critical level of overlap (>89 in Babolsar samples and >84 in Noushahar samples). This competition is one of the reasons for the decline of anchovy sprat. also, the results show M. leidyi is feeding on fish eggs, but effects of this factor on anchovy population is less than feeding competition. Controlling of M. leidyi population is reducing the pressure of its invasion and the effective approach is introduces a predator to the Caspian Sea.

Keywords
Anchovy sprat, Clupeonella engralifourmis, Ctenophore, dietary overlap, feeding competition,

 
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