Standardizing trawlnets for white shrimp (Metapenaeus affinis) in Iranian waters of the Persian Gulf

Abstract

This survey has been accomplished in order to obtain scientific solution to meet the Iranian Fisheries requirements in using standard fishing nets for white shrimp (Metapenaeus affinis), and to help preservation of this aquatic resource, and also to help the responsible in programming the fishing activates and compiling specific rules on this regard. For this purpose and with attention to behavioral position of shrimps, four trawl nets were procured and have been used during 1991. The nets were used In Khuor Musa district (khouzestan province) which is the habitat of white shrimp. Using the mathematical methods and curves, the L25%, L50% and L75% parameters were calculated for all the nets. Fishing pressure was determined to be exploitable in the mentioned longitudinal groups. The CPUE was also calculated and important information were obtained about suitable exploitation of this aquatic organism, by studying the position of white shrimp resources, the fishing rate of this shrimp, and also the fishing rate of small and noncommercial shrimps. All information indicate that the trawl net no. 3 is the most suitable one. Specifications are given in the report.