DATA OF PRODUCTION AND WATER QUALITY FROM A COMMERCIAL AND SEMI-INTENSIVE CULTURE OF THE SHRIMP PENAEUS SUBTILIS AND P. VANNANEI WITH THE UTILIZATION OF FEEDING TRAYS

Abstract

The present study was conducted in a commercial marine shrimp farm located in Arez, State of Rio Grande do Norte, during the months of October, 1995 to June, 1996. The paper aimed to report production and water quality parameters data from two semi-intensive cycles of the shrimp Penaeus subtilis and P. vannamei, fed a commercial pelletized dry feed utilizing feeding trays. In cycle 1, the species P. subtilis was stocked in three grow-out ponds, V₁, V₂ and V₃, in an initial stocking density (DE_in) of 7.4, 8.2 and 8.3 shrimp/m² and cultured for 65, 119 and 103 days, respectively. In cycle 2, the species P. vannamei was stocked in ponds V₁, V₂ and V₃ with DE_in equal to 10.3, 10.0 and 10.4 shrimp/m²respectively, and cultured during the following periods: 109, 116 and 111 days. Throughout the two production cycles, shrimp average body weight, shrimp survival and polychaete density in the substrate were determined weekly. Daily, in the early morning and late afternoon, water physical and chemical parameters (i.e., pH, temperature, dissolved oxygen, salinity and transparency) were analyzed and the amount of feed administered in feeding trays determined. In ponds V₁, V₂ and V₃, P. subtilis attained: final average body weight (xP_Fi) equal to 13.80, 12.43 and 13.50 g; average growth rate (xC_Fi) of 0.212, 0.104 and 0.131 g/day; final survival (S_Fi) of 18.89, 47.04 and 29.11%; food conversion ratio (RCA_To) of 1.09, 2.74 and 3.99; and final yield (Prd_Fi) equal to 194.24, 482.52 and 327.50 kg/ha, being administered an average amount of feed equal to 16.613, 31.799 and 30.465 kg/day, respectively. In cycle 2, in ponds V₁, V₂ and V₃ stocked with P. vannamei, the following results were observed: xP_Fi of 12.70, 10.60 and 10.10 g; xC_Fi of 0.116, 0.091 and 0.091 g/day; S_Fi of 32.02, 48.46 and 65.94%; RCA_To of 2.08, 1.98 and 2.34; Prd_fi of 419.41, 615.38 and 693.75 kg/ha, being distributed an average amount of feed of 40.715, 30.037 and 35.179 kg/ha, respectively. Analysis of Variance (ANOVA) revealed statistically significant differences (P<0.05) between cycles 1 and 2 in water transparency in ponds V₁ and V₂, in salinity, in ponds V₁, V₂ and V₃ and in temperature, in pond V₁. The amount of feed administered per day and polychaete density in the substrate were statistically different (P < 0.05) between cycles 1 and 2, in ponds V₁ and V₂