Effects of stocking density, feeding, fertilization and combined fertilization-feeding on the performances of striped grey mullet (Mugil cephalus L.) fingerlings in brackishwater pond rearing systems

详细信息    查看全文

• 作者：G. Biswas^a ; ^{gbis47@gmail.com} ; Debasis De^a ; A.R. Thirunavukkarasu^b ; M. Natarajan^b ; J.K. Sundaray^a ; M. Kailasam^b ; Prem Kumar^b ; T.K. Ghoshal^a ; A.G. Ponniah^b ; A. Sarkar^c
• 关键词：Stocking density ; Feeding ; Fertilization ; Striped grey mullet ; Brackishwater pond ; Seed rearing
• 刊名：Aquaculture
• 出版年：2012
• 出版时间：29 March, 2012
• 年：2012
• 卷：338-341
• 期：Complete
• 页码：284-292
• 全文大小：414 K

文摘

Growth, survival, biomass production and body composition of striped grey mullet (Mugil cephalus L.) fingerlings were evaluated in two pond experimental trials as a function of two stocking densities and three management systems in brackishwater pond rearing. The three management systems tested were feeding, fertilization and combined fertilization-feeding. The Experiment 1 had a 2 ¡Á 2 factorial design with two levels of stocking density and two types of pond management system (feeding and fertilization) resulting in four treatments in triplicates: stocking density 1 + feeding (S1F1), stocking density 1 + fertilization (S1F2), stocking density 2 + feeding (S2F1) and stocking density 2 + fertilization (S2F2). Twelve ponds (600 m² each) were stocked with grey mullet fry (0.17 ¡À 0.02 g/23.8 ¡À 0.6 mm) at 7500 number ha^?#xA0;1 in treatments S1F1, and S1F2 and at 15,000 number ha^?#xA0;1 in treatments S2F1, and S2F2. In Experiment 2, three different pond management systems evaluated as three treatments (in triplicate ponds) were FR: fingerling rearing with fertilization; FD: fingerling rearing with feeding and FF: fingerling rearing with combination of fertilization + feeding. Nine ponds (600 m² each) under the three treatments were stocked with grey mullet fry (0.55 ¡À 0.08 g/36.0 ¡À 2.1 mm) at 15,000 number ha^?#xA0;1. In S1F1, S2F1, FD and FF, formulated feed containing 27.5 % crude protein was provided at 3.5-20 % body weight daily, whereas, in S1F2, S2F2, FR and FF systems, ponds were fertilized fortnightly with cattle manure, urea and single super phosphate at 500, 30 and 30 kg ha^?#xA0;1, respectively. In Experiment 1, although stocking density and application of feed or fertilization did not affect the growth parameters, survival and apparent feed conversion ratio (P > 0.05) of grey mullet, coefficient of variation at harvest weight (CV_hw) and total harvested biomass were influenced by feeding or fertilization (P < 0.05). In Experiment 2, significantly better growth, lower CV_hw and higher total harvested fish biomass were obtained in fishes of FF compared with that of FR and FD (P < 0.05). From the pond trials it can be concluded that combined fertilization-feeding system with a stocking density of 15,000 fry ha^?#xA0;1 would be appropriate for production of striped grey mullet fingerlings in brackishwater ponds. The present findings indicate feasibility of establishing M. cephalus seed rearing practice using a cost-effective and resource-efficient approach.