Effect of different stocking combinations on growth, production and survival of milkfish (Chanos chanos Forskal) and prawn (Penaeus monodon Fabricius) in polyculture in brackishwater ponds
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Milkfish (Chanos chanos) and prawn (Penaeus monodon) were stocked in 500 m2 earthen ponds from 12 November 1978 to 15 March 1979 at the following combinations: 2000 milkfish fingerlings per ha (treatment I); 2000 milkfish fingerlings plus 4000 prawn juveniles per ha (treatment II); and 2000 milkfish fingerlings plus 8000 prawn juveniles per ha (treatment III), with three replicates per treatment. Highest combined net milkfish and prawn production was obtained in treatment III with 492.1 kg/ha followed by treatment II with 404.1 kg/ha, and treatment I (milkfish only) with 280 kg/ha. Differences in combined net production between treatments III and I and between treatments II and I were statistically significant at the 5% level. Average net production of milkfish alone was also highest in treatment III followed by treatment II and treatment I, although differences were not significant. Average net production for prawn was also better in treatment III than in treatment II but the difference was not significant. However, mean weight of prawn was higher in treatment II compared to treatment III. Average survival rates were high for milkfish in all treatments ranging from 90 to 96%, but low for prawn at around 50% for both treatments. There was no significant difference in survival rates of milkfish among treatments and of prawn between treatments II and III. The competition index between milkfish and prawn at the given stocking combinations was negative indicating a positive, advantageous influence of prawn on milkfish production.
Contribution No. 77 of the Aquaculture Department, SEAFDEC.
CitationEldani, A., & Primavera, J. H. (1981). Effect of different stocking combinations on growth, production and survival of milkfish (Chanos chanos Forskal) and prawn (Penaeus monodon Fabricius) in polyculture in brackishwater ponds.
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Series: Aquaculture extension manual; No. 63A 26-page manual describing the site selection, hatchery design, spawning, larval rearing, natural food production, and economic analysis for milkfish.
ArticleTwo experiments were conducted to measure the economic viability of retarding milkfish growth (stunting) in brackishwater ponds. In the first experiment, 2-month-old fish were reared for 6 months in ponds with initial stocking densities of 15, 20, 25, and 30 fish/m2. The second experiment had a common stocking density of 20 fish/m2 with rearing periods of 6, 9, and 12 months. All experiments followed the lab-lab method of growing natural food plus additional substrates. Supplemental feeding using rice bran mixed with ground trash fish started 60 days after initial stocking. Under Philippine conditions stunting milkfish fingerlings at 20 fish/m2 for 6–9 months is most cost effective; this permits the production of milkfish fingerlings for lower cost than they can be purchased.
Effects of increased stocking density and supplemental feeding on the production of milkfish fingerlings CT Villegas & I Bombeo -
Fisheries Research Journal of the Philippines, 1982 - Fisheries Research Society of the PhilippinesExperiments were conducted in twelve 144 sq. m. brackishwater ponds at Leganes Research Station, SEAFDEC, to determine the effect of increased stocking density and supplemental feeding on milkfish fingerling production. Two stocking densities (50 and 75 fry/sq. m.) with and without supplemental feeding with rice bran and a formulated diet were tested in a completely randomized design with three replicates. Results showed that increased stocking density from 50 fry/ sq. m. to 75 fry/sq. m. fed with rice bran gave a mean survival rate of 71.50%. Growth, measured in terms of weight and length, was not significantly different between treatments. Profitability of increased stocking density and supplemental feeding are discussed.