The catch per unit of effort catch per unit of swept area and biomass of Threadfin Bream (Nemipterus japonicus) by swept area method in coastal waters of bushehr province

Abstract

The aim of this study was to investigate and estimate the CPUE (Catch Per Unit of Effort), CPUA (Catch Per Unit of Swept Area), biomass and length frequency of Threadfin Bream (Nemipterus japonicus) in Coastal waters of Bushehr. This study was carried out in March 2011. The study area was divided into three area (Northern, Central and Southern) and depth zones (10-20, 20-30 and 30-50 m) and stratified random sampling was used to collect data. The sampling data was collected from 41 stations. The forked length of Nemipterus japonicas was ranged from 14 to 29 cm and the average forked length was calculated 20.29±2.64. Total CPUE and biomass of Nemipterus japonicas were calculated 16259 tonnes and 1771 kg/hours, respectively. The minimum and maximum CPUE were observed in 20-30 m depth zone (169.1 kg/hours) and 30-50 depth zone (1370.8 kg/hours), respectively. Total CPUA of Nemipterus japonicus was calculated 19678.8 kg/nm2. The minimum and maximum CPUA were observed in 10-20 m depth zone with 4.1 kg/nm2 and 30-50 m depth zone with 2147.7 kg/nm2, respectively. The results showed that the most abundance of Nemipterus japonicus was in higher than 30 m depth zones in Bushehr waters.

Keywords

• nemipterus japonicus
• length frequency
• biomass
• bushehr province