A Survey on the effects of the Cochlodinium.sp bloom on the survival of the Litopenaeus vannamei shrimp

Red tide event a product of micro algae abundance has elevated in last few years. Loss of aquatic life due to HAB, and its effect on human health, has caused tremendous damage in the world. In this research the effect of (1, 2, 3, 9, and 30) ×10^3 Cells ml^-1 densities of Cochlodinium polykrikoides on survival and histopathological effect on hepatopancreas and gills of Litopenaeus vannamei postlarvae (PLs) and juvenile stages has been investigated. Results showed 100% survival with (1, 2, and 3) ×10^3 Cells ml-1 densities but accumulative mortality in 9×10^3 Cells ml^-1 density were 1.33% and 2.22%, in PLs and juvenile stages respectively, and there is no significant difference between control and treatment groups. accumulative mortality in 3×10^4 Cells ml^-1 density was 4.44% and 17.8% in PLs and juveniles respectively which have significant different with control groups. According to histopathological investigation in this density the infiltration of blood cells in connective tissue of hepatopancreatic tubules and gills lamellae of PLs and juvenile stages were low but high in 3×10^4 Cells ml^-1. The intensity of infiltration in juvenile stages was higher than PLs, which indicate incensement of hepatopancreatic and gills blood cells in higher densities of this phytoplankton. The end result of the study indicates that in high densities of C. polykrikoides survival rate in PLs and juveniles decreased and according to histopathological study the most important possible factor in shrimp mortality when exposure to C. polykrikoides was settlement of phytoplankton on gills lamellae and preventing oxygen exchange of shrimp.

Bibliographic Details

Main Authors:	Yeganeh, Vahid, Matinfar, A., Aein Jamshid, Kh., Mirbakhsh, M., Ghaednia, B., Dashtian Nasab, A., Keshtkar, E., Nazari, M.A., Kakoolaki, S.
Format:	Report biblioteca
Language:	Persian
Published:	Iranian Fisheries Science Research Institute 2016
Subjects:	Cochlodinium polykrikoides, Litopenaeus vannamei, Bloom, Histopathological, Survival, Investigation,
Online Access:	http://hdl.handle.net/1834/13970
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