TY - JOUR AU - McGinty, Andrew S. AU - Alston, Dallas E. PY - 1987/04/01 Y2 - 2024/03/29 TI - Polyculture of all-male tilapia hybrids with low densities of Macrobrachium rosenbergii JF - The Journal of Agriculture of the University of Puerto Rico JA - JAUPR VL - 71 IS - 2 SE - Articles DO - 10.46429/jaupr.v71i2.6945 UR - https://revistas.upr.edu/index.php/jaupr/article/view/6945 SP - 225-229 AB - <p>Each of six 700-m<sup>2</sup><sub>&nbsp;</sub>earthen ponds was stocked with all-male hybrid fingerlings (28 g) from the cross of female <em>Tilapia nilotica</em> x male<em> T. hornorum</em>, at a rate of 0.4 fish/m<sup>2</sup>. Six days later, duplicate ponds were stocked with either 0.5, 1.0 or 1.5 juvenile prawns (<em>Macrobrachium rosenbergii</em>) (2 g) per m<sup>2</sup>. Initially 32% protein pellets were fed daily at 2.5% of fish biomass; this ratio was decreased to 1.4% by harvest. At the low, medium and high prawn densities, average yields after 20 weeks were 171, 243, and 350 kg/ha lor prawns and 1,404; 1,450; and 1,356 kglha for tilapia, respectively. At these densities, 84.4, 87.7, and 85.4% of the prawns weighed 30 g or more, whereas 75.0, 67.5, and 71.3% weighed 40 g or more, respectively. Average weight of tilapia was 395 g among all ponds, independent of prawn density.</p> ER -