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0.05). The liner regression showed relationship between the increase of bacterial and parasitical contaminations respect to stocking density. Also results showed that increasing of the shrimp density caused increase in all pathogen agents.]]>
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60%). Gelatin extraction was done in constant conditions by Chloridric acid pretreatment. The results of qualitative identification of samples were positive and according to standards, concluded that the extracted products were gelatin. Also, total nitrogen, humidity and pH of samples were in standard limits, but ash content was upper than maximum standard level. Minimum concentration of extracted gelatins for gel formation were and no significant differences were observed between extracted gelatin samples. Melting temperature of rays gelatins ranged 20-25 ֯C. Maximum and minimum yield of gelatin extraction yield were 20.4% and 19.0%, respectively. No significant difference were observed between gelatin extraction yield of four ray species (P >0.05). Results suggested that for industrial uses, the skin of different ray species can be mixed and use together.]]>
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