Hatchery seed production of giant freshwater prawn,Macrobrachium rosenbergii using inland ground saline water in India          下载免费PDF全文

Sudhir Raizada  Hasan Javed  Subbanna Ayyappan  Subas C Mukhergee  Umesh K Maheshwari  D Stewart Fielder 《Aquaculture Research》2015,46(1):49-58

The suitability of inland saline water (ISW) from the Lahli‐Baniyani Fish Farm, Rohtak was investigated for the larval rearing of giant freshwater prawn (GFP), Macrobrachium rosenbergii. Six experiments were conducted. In Experiment‐I, 54% of the larvae metamorphosed to postlarvae (PL) in constituted seawater (CSW) whereas total mortality occurred at larval stages (LS)‐II and LS‐III in ISW with salinity of 12 g L^?1. Larvae survived to LS‐IV in Experiment‐II, when ISW was supplemented with K⁺~ SW. In Experiment‐III, total hardness in ISW was reduced serially, but K⁺ ~ SW was supplemented. The larvae did not survive beyond LS‐V. In Experiment‐IV, ISW was amended with different ratios of Mg²⁺/Ca²⁺ and K⁺ ~ SW. The larvae successfully metamorphosed to postlarvae with highest survival of 51.6% in Mg²⁺/Ca²⁺ ratio of 2.5. In Experiment‐V, eight larval cycles were run with water quality used in Experiment V, where all the cycles produced PL's with a survival rate of 20–67%. In Experiment VI, the larvae were reared in Mg²⁺/Ca²⁺ ratio of 2.5 and different levels of K⁺ to optimize its requirement. The ISW amended with K⁺ 80% ~ SW and Mg²⁺/Ca²⁺ ratio of 2.5 was found to be commercially suitable for the seed production of GFP.  相似文献   

Effect of Protease Treatment on Oil Extractability of Carotenoids from Shrimp Waste     

Nakkarike Manjabhat Sachindra  Namadev Subbanna Mahendrakar 《Journal Of Aquatic Food Product Technology》2013,22(1):22-31

Crustacean waste is an important source of natural carotenoids. Carotenoids in shrimp waste occur as a complex with proteins. Investigations were carried out to assess the effect of hydrolyzing shrimp waste with different proteases on the subsequent recovery of carotenoids in vegetable oil. Hydrolyzing the shrimp waste with the bacterial protease alcalase gave higher extraction yields in oil (28.6 μg/g waste) compared to hydrolyzing with the plant protease papain (24.8 μg/g) or the animal protease trypsin (25.3 μg/g). Optimized conditions for alcalase treatment and extraction of carotenoids was determined to be hydrolysis of shrimp waste with 0.75% of alcalase at 37°C for 150 min, adding sunflower oil to hydrolyzed waste in a ratio of 2:1, and heating at 70°C for 90 min. Prior hydrolysis of waste considerably reduced the heating time required for maximum extraction of pigments, which may help in preventing the carotenoid degradation during prolonged heating in oil.  相似文献