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排序方式: 共有193条查询结果,搜索用时 15 毫秒
191.
Suman Bhusan Chakraborty Samir Banerjee Saibal Chatterjee 《Aquaculture International》2011,19(6):1119-1137
The aim of this study was to investigate the molecular mechanism behind androgen-induced sex reversal and growth increase
in Nile tilapia. Three-day-old mixed-sex tilapia juveniles were treated with differential dose (0, 5, 10, 20, 30 mg/kg diet)
and duration (0, 15, 30, 45, 60 days) regimes of 17α-methyltestosterone. Treatment regimes 10, 20, 30 mg/kg-30, 45, 60 days
showed ~95% males, while 0 mg/kg-0 days (control) showed ~50% males (P < 0.01). Next, tilapia was cultured for 6 months in cistern and pond culture systems with 17α-methyltestosterone-treated
diet (10 mg/kg) for three different durations: 0 days (control), 30 days (30-day-treated), and 180 days (throughout-treated).
Fish in pond culture showed significantly higher (P < 0.05) final weight compared with tilapia in cistern culture (235.76, 156.82 g, respectively). Both 30-day-treated and throughout-treated
fish showed significantly higher (P < 0.05) final weight, length, daily weight gain, specific growth rate, and muscle protein content compared with control fish.
The androgen receptor β mRNA and protein expression levels in both 30-day-treated and throughout-treated fish were significantly
higher (~twofolds, P < 0.05) compared with hormone-untreated control males. However, there was not much difference for all these parameters among
the two hormone-treated groups. This higher growth probably results from an androgen-induced increased ‘androgen-androgen
receptor’ mediated anabolic pathway. Serum testosterone concentration of 30-day-treated fish after 6 months was similar to
that of control males (0.9 ng/ml). Moreover, culture of 17α-methyltestosterone-treated monosex tilapia was found beneficial
than hormone-untreated mixed-sex tilapia culture for maintenance of natural fish diversity in indigenous water bodies. 相似文献
192.
Enhanced growth and immuno‐physiological response of Genetically Improved Farmed Tilapia in indoor biofloc units at different stocking densities
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Harsha Haridas Ajit Kumar Verma Gaurav Rathore Chandra Prakash Paramita Banerjee Sawant Asanaru Majeedkutty Babitha Rani 《Aquaculture Research》2017,48(8):4346-4355
An experimental trial was conducted for 90 days to evaluate the growth performance, immunophysiological response of GIFT strain of Tilapia in biofloc‐based rearing system and to assess the relative percentage survival in 3 days after challenging with the virulent strain of Aeromonas hydrophila. Fingerlings with an average body weight 0.98 ± 0.06 g were stocked in triplicate at different stocking densities of 200 (SD1), 250 (SD2), 300 (SD3) and 350 (SD4) m?3 in biofloc‐based treatments and 150 (C) m?3 in control (clear water). Biofloc‐based units (SD1 and SD2) obtained significantly better (P < 0.05) growth performances at the end of the experimental period. Mean body weight of fish in biofloc‐based units showed a decreasing trend with increase in stocking density with 100% survival in all units including control. The stress parameters were significantly lower in biofloc‐based rearing units especially in treatments SD1 and SD2 as compared to the control. The fish from the biofloc‐based units (SD1 and SD2) possessed significantly (P < 0.05) higher immune status as compared to control and other biofloc treatments in terms of respiratory burst, serum lysozyme and myeloperoxidase activity. Relative survival percentages were significantly better in biofloc treatments with highest in SD1 and SD2 (83.33%) after challenge study. GIFT strain of Tilapia at higher stocking densities 200–250 nos m?3 can be taken as optimum stocking density whereas higher stocking densities up to 350 nos m?3 can be reared in the biofloc systems without compromising the growth and immunity. 相似文献
193.
Rahman Norazira Abdu Khatoon Helena Yusuf Norhayati Banerjee Sanjoy Haris Noor Azilah Lananan Fathurrahman Tomoyo Katayama 《International Aquatic Research》2017,9(3):235-247
International Aquatic Research - Shrimp is an important traded fishery commodity. When subjected to stress, shrimp usually suffers from oxidative stress, which leads to cell injury, senescence, and... 相似文献