علوم زیستی دریا
Mohammad Ahmadi; Preeta Kochanian; Hassan Salehi; Vahid Yavari; Seyed Hosein Hoseinifar
Abstract
Risk identification and consideration are vital for development and future planning of shrimp aquaculture. For survey of production and development characteristics of shrimp hatcheries in Iran, a questionnaire was prepared based on international standards and references, and several stockholders of shrimp ...
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Risk identification and consideration are vital for development and future planning of shrimp aquaculture. For survey of production and development characteristics of shrimp hatcheries in Iran, a questionnaire was prepared based on international standards and references, and several stockholders of shrimp hatcheries were consulted. Results indicated that feed, foreign technician, and financial resources is the major challenges of Iranian shrimp hatcheries. Major objective of this research was to obtain opinions and experiences of stockholders that active in shrimp hatcheries in Iran. Indentification of present challenges of Iranian shrimp hatcheries was another objective of the study. Creating a ground for cooperation between the Universities, industry and State administration is important to identify the issues existing in the shrimp culture industry and to put forward practical and feasible solutions. The ground that each section trust other and see “otherness experience” as own experience. It is needs reconstruction and redefinition of experiences and concepts in this framework.
Mohammad Ahmadi
Abstract
For study the reproductive physiological differences between fall and spring migrants of Caspian Lamprey (Caspiomyzon wagneri) in the south of Caspian Sea, Shirood River. 15 & 16 fish in autumn and spring were collected. Hormone measured by ELIZA method, and for histological study conventional method ...
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For study the reproductive physiological differences between fall and spring migrants of Caspian Lamprey (Caspiomyzon wagneri) in the south of Caspian Sea, Shirood River. 15 & 16 fish in autumn and spring were collected. Hormone measured by ELIZA method, and for histological study conventional method and Hematoxilin-eosin staining was performed. In the both spring and autumn season Fishes are in the final reproductive stage, based on Histological studies of gonads, but did not spawning yet. Concentration of testosterone, 17β-estradiol and progesterone hormones of males, in both season, are higher than females, with an exception. Progesterone of females in spring higher than males. Testosterone of males and females is not different between autumn and spring. 17β-estradiol concentrations of females are similar in to two seasons but in autumn males had higher concentrations of 17β-estradiol. Progesterone of males and females was different in both seasons. Generally, the results indicated some reproduction signs of Caspian Lamprey in both fall and spring season.