Population dynamics of dominant shrimps in northeast of Qeshm Island

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Abstract

The Chaoo Sharghi is located nearby mangrove forest in northwest of Qeshm Island, in the
northern Persian Gulf. Given standing in migration of juvenile shrimps, this area is one of
important regions in Hormozgan Province. This study aimed to determine population
dynamics of major shrimp stocks by swept area method in this area. Sampling was carried out
monthly since March 2009 to June 2010. The average of carapace length frequency of
Banana, Jinga, Kiddy and Peregrine shrimps showed that upswing from January to April.
However, shrimps were predominantly juvenile. The annual growth coefficient (k) of female
and male was 1.5 and 1.1 for F. merguiensis, 1.3 and 1.2 for M. affinis, 1.1 and 1 for M.
stebbingi and 1.2 and 1.1 for P. stylifera, respectively. The asymptotic carapace length (CL∞)
of female and male was 44mm and 31mm for P. merguiensis, 36mm and 31mm for M.
affinis, 28mm and 18.5mm for M. stebbingi and 27.5mm and 18.5mm for P. stylifera,
respectively. The mortality parameters of male and female shrimps were different in range
including 2.36 – 4.54 for total mortality, about, 2.12–1.83 for natural mortality and 0.24–2.50
for fishing mortality. Total mortality rate for M. affinis and M. stebbingi showed that this rate
for males was higher than females. Conversely, total mortality rate for F. merguiensis and P.
stylifera was higher for females than males. Exploitation rate for all species was higher in
females than that for males. In this study, the highest estimated biomass was found in Kiddy
and Jinga shrimps and the lowest biomass was found in Indian white shrimp. The peak of
biomass and CPUE was obtained during July-August.

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Iranian Scientific Fisheries Journal
Volume 21, Issue 3 - Serial Number 80
November and December 2012
Pages 85-98

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