Qualitative & quantitative survey of bonyfishes fingerlings being released as stocking materials in Southern Caspian Sea Guilan province in 2002

Abstract

The brooders of kutum fishes, bream and pike-perch are caught in their spawning grounds, at the commence of spring season in west and eastem parts of Gilan. After eggs stripping and larva-culture until fingerlings size in hatchery, the seedling fishes are released through their natal rivers for down stream migration into Caspian Sea In the mentioned year 127.2* 10 Rutilushisii kutum fingerlings with the average weight of I .29 g and length of 4.8 Cm are produced. Considering the mean weight of fingerlings released in Gilants rivers, nearly 16 % fingerlings were under I grand weight group of 1-1.5 g comprised 68 % , Transportation procedures of fingerlings releasing lasted 5 months and further than 79% of fingerlings released in june-Agust (Peak of warm weather), this coincide with reduced water discharge and low depth in rivers . These ecological extremity needs to be carefully checked by assessment recruitment of stocked fingerlings into fishery. The brooders of kutum fishes, bream and pike-perch are caught in their spawning grounds, at the commence of spring season in west and eastem parts of Gilan. After eggs stripping and larvi-culture until fingerlings size in hatchery, the seedling fishes are released through their natal rivers for down stream migration into Caspian Sea In the mentioned year 127.2 10 Rutilusjhisii kutum fingerlings with the average weight of I .29 g and length of 4.8 Cm are produced. Considering the mean weight of fingerlings released in Gilants rivers, nearly 16 % fingerlings were under I grand weight group of 1-1.5 g comprised 68 % , Transportation procedures of fingerlings releasing lasted 5 months and further than 79% of fingerlings released in june-Agust (Peak of warm weather), this coincide with reduced water discharge and low depth in rivers . These ecological extremity needs to be carefully checked by assessment recruitment of stocked fingerlings into fishery.