Abstract
In the present study, the quality of Litopenaeus vannamei postlarvae (PL) produced in some commercial hatcheries evaluated in three different hatcheries with different management in Chouebdeh Abadan, Iran. For evaluating management effects on PL quality, 180 postlarvae (30 postlarvae for each quality index) sampled from three hatcheries during the two sampling periods. Then morphometric indices (including body weight, total length, carapace length, length of the intestine, diameter of the sixth abdominal segment), behavioral indices (swimming activity), stress test (salinities of 0%, and 50%, formalin 100 and 200 ppm), carcass biochemical compositions, microbial indices, and microscopic observations) were analyzed and recorded. Management features assessed using a questionnaire. Based on the results, the highest morphometric indices were attributed to hatcheries 2 & 3. Also, the hepatopancreas index in hatchery no. 3 was better than other hatcheries. Similarly, the highest survival rate in the stress test and behavioral index were observed in the PLs of hatchery no. 3. The results of carcass biochemical composition also showed that carcass lipid decreased by increasing carcass protein content. The highest bacterial load was observed in the PLs of hatchery no. 2. The results of microscopic observations indicated that the post-larvae in the third hatchery had a completely dilated intestine and contained more food. The hepatopancreatic tissue was larger and consisted of multiple B cells with large vesicles. Based on the questionnaire, all PL samples were in PL 12 stage. The main differences between hatchery no. 3 and other hatcheries were as follows: The broodstocks weight was higher than other hatcheries; fresh and formulated diet was used in hatchery no. 3; larval growth assay, nauplius, and postlarval survival assay was carried out on a regular basis, and no sludge accumulation at the bottom of the tanks was observed in hatchery no. 3. The results of this research show that appropriate management, in hatchery no. 3 in comparison to other hatcheries, is considered as the main factor resulting in better quality for postlarvae production.
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