بررسي تاثير اندازه چشمه هاي گرگور بر تركيب و فراواني ماهيان صيد شده در استان بوشهر

The effect of various trap (gargoor) mesh size on the catch fish composition and abundance in Bushehr province

This study was conducted from February 2007 till July 2007 in which two types of trap B & C with 5 and 7 cm mesh were compared to usual 3.5 - 4 cm mesh size used by artisanal fishermen. Two different dhows and traps were used in 6 sets of 50 each. Bushehr province was selected as study area. As a result, 1755 pieces of fish belonging to 30 species from 14 families were caught. More than 41% catches number belonged to (Carangoides talamporoides) and other species (Argyrops spinifer), (Pomadasys kaakan), (Acanthopagrus latus), (Caranx ignobilis) ,(Epinephelus coioides) and (Lutjanus malabaricus) respectively. Total number of fishes were 90.99% in type A, 95.56% in type B and 93.83% in type C. Total weight of fishes were 90.77 % in type A ,93.15% in type B and 87.19% in type C which all belonged to only 7 species. The catch per trap month (CPUE) in A, B and C type traps were estimated to be , 1.8 , 1.0 and 0.6 kg / trap- month respectively , while the highest CPUE belonged to type A in May (3.9 kg / trap- month). The results from one way ANOVA (LSD) indicated that there is a significant difference between A and B type traps with C in all measured factors (P<0.05) and B type indicated significant difference with A type in weight average and length (P<0.05). Due to high percentage of fish escape from C type traps (7cm mesh size), it isnʹt advisable to be used in further investigation. Re-enforcing the trap wires in B type traps and increasing the frequency of inspection per month should be investigated. * Corresponding author: Keywords: Trap (Gargoor), Bushehr province, Mesh size trap (Gargoor), Catch composition