14 research outputs found
Accumulation of toxic and essential trace metals in fish and prawns from Keti Bunder Thatta District, Sindh.
Abstract.-Toxic and essential trace element, contents of six fish and two prawn species from Keti Bunder were determined by atomic absorption spectrometry. The mean concentrations (µg g −1 wet weight) of toxic and trace elements in the muscle of fish and prawn were Cd: 0.024-0.035 and 0.025-0
Effect of Aeration on Water Quality, Fish Growth and Survival in Aquaculture Ponds
Abstract.-Fingerlings of Labeo rohita, Cirrhinus mrigala, Hypophthalmichthys molitrix and Ctenopharyngodon idella (average weight 32.0 gram) were cultured in six brick lined (26'x12'x6') ponds for a period of six months. The stocking ratio was 7:4:4:3, respectively and the stocking density of each pond was 2508 fish/acre. Three of the six ponds served as aerated ponds and other three as non-aerated ponds. Aeration was done with the help of 1/3 Hp vertical pump. Fish in each pond were fed with 20% protein diet @ 3% body weight. The ponds were fertilized with cattle manure (@ 500 kg/acre) and chemical fertilizers @ 20:2:0 (N:P:K). Significantly high growth (P<0.0001) and survival of fish (P<0.0001) was observed in aerated ponds as compared to the non-aerated ponds. Pond aeration has resulted in 2095 Kg/acre more fish production with economic benefit of Rs. 144,130