علوم زیستی دریا
Amir Bosak; Vahid Yavari; Hossein Mohammad Asgari
Abstract
One of the most important concerns in fisheries management is finding suitable areas and zones to invest in aquaculture with a sustainable development approach. The use of GIS is one of the most important factors for success in aquaculture development. Site selection of sturgeon breeding and farming ...
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One of the most important concerns in fisheries management is finding suitable areas and zones to invest in aquaculture with a sustainable development approach. The use of GIS is one of the most important factors for success in aquaculture development. Site selection of sturgeon breeding and farming locations was carried out using the facilities of GIS and data analysis was performed using fuzzy model, hierarchical analysis process and the fuzzy criteria AHP. The main criteria used in this study were ecological, climatic, natural and environmental, economic and social factors, barriers and limitations and sensitive habitats. Then, using the weighting method, a competency map was prepared and with considering the merit and applying the average of the merit value of each place, the priority of each place was determined. Combining this method with fuzzy logic and application in GIS environment and also taking into consideration the weight and relative importance of each feature and option, has increased the efficiency of this method. According to the results, the highest weight was awarded to ecological factors (0.321), the next ranks were awarded to climate (0.205), economic and social (0.179), natural (0.167) factors and barriers and restrictions (0.129), respectively. The most suitable areas for the development of sturgeon breeding and culture centers are located in the northern, northeastern and eastern regions of the Khuzestan province. The most unsuitable sites are located in the southern regions of the province.
علوم زیستی دریا
gh a; v y; v m
Abstract
In this study, the capacity of Siberian sturgeon, Acipenser baerii with mean weight 19.3±0.4 g to face short-term starvation and subsequent re-feeding was assessed for a 40-day period. To investigate, the effect of compensatory growth on some physiological response (plasma cortisol, thyroid hormones, ...
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In this study, the capacity of Siberian sturgeon, Acipenser baerii with mean weight 19.3±0.4 g to face short-term starvation and subsequent re-feeding was assessed for a 40-day period. To investigate, the effect of compensatory growth on some physiological response (plasma cortisol, thyroid hormones, glucose, protein, cholesterol and triglyceride) and morphological (total body weight and length, condition factor, hepato-somatic index, vicero-somatic index and digestive-somatic index) in Siberian sturgeon four different feeding regimes were established. Control group fed four times daily to apparent satiation; SRF1: 2 days starvation and 8 days refeeding; SRF2: 4 days starvation and 16 days refeeding; SRF3: 8 days starvation and 32 days refeeding were experienced. At the end of experiment, blood samples were collected to analyze biochemical parameters. Plasma cortisol and thyroxin (T4) hormones levels were not significantly different between control and food deprived groups at the end of experiment (P>0.05) but plasma tri-iodothyronin (T3) levels were lower in the starved groups compared to control animals, but this decreases only in S1 group was significant (P<0.05). There were no significant difference in measured metabolites levels between control and food deprived groups (P>0.05). Moreover, at the measured morphometric indices were not observed significantly different between the control and starved groups (P>0.05). The results suggest that Siberian sturgeon has the physiologic and metabolic adjustment ability to short-term starvation and return to basal level after re-feeding.