Now showing items 1-2 of 2

    • Conference paper

      The effect of diet on the reproductive performance of pond-reared Penaeus monodon Fabricius broodstock 

      OM Millamena, JH Primavera, RA Pudadera & RV Caballero - In JL Maclean, LB Dizon & LV Hosillos (Eds.), The First Asian Fisheries Forum: Proceedings of the First Asian Fisheries Forum, Manila, Philippines, 26-31 May 1986, 1986 - Asian Fisheries Society
      Three practical diets were tested for their effects on the reproductive performance, survival and larval quality of pond-reared Penaeus monodon. Diets A, B and C were formulated to contain the same basal components but supplemented with different sources of lipids. Lipid sources were cod liver oil (Diet A), soybean lecithin (Diet C) or their 1:1 combination (Diet B). An all-natural diet consisting of squid and marine annelids served as control. Pond-raised P. monodon were stocked in four 12-m3 flow-through maturation tanks with 28 females and 22 males per tank. Broodstock were acclimated to the diets prior to unilateral ablation of females. Reproductive performance in terms of total number of spawnings, eggs and nauplii production, average hatch rate of eggs and larval quality was best for Diet A followed by Diet C. Diet B gave the poorest overall response but was better than the control. In the control most of the mature females resorbed their ovaries and failed to spawn; survival rates of females was also lowest. The results suggest that nutritional quality of broodstock diet affects reproduction and larval survival. Diet A (cod liver oil supplemented) was found to be a suitable diet for successful maturation and spawning of pond-reared P. monodon.
    • Article

      Effect of tagging on maturation and survival of ablated Penaeus monodon in painted and unpainted tanks 

      JH Primavera & RV Caballero - The Philippine Scientist, 1989 - San Carlos Publications, University of San Carlos
      A study was conducted to determine the effects of tags and tank color on reproductive performance and survival of pond-reared Penaeus monodon after eyestalk ablation. In 1986, the best over-all reproductive performance was frm eyestalk-tagged females in black tanks. Because of varying water flow through rates and loss of carepeace tags, statistical analysis was not possible. The 1987 study showed that tagging and tank color had no effect on maturation but survival rates of tagged (83.5%) in black and unpainted tanks. The 1986 results also showed lower survival rates of eyestalk-tagged females (31.2-59.0%) compared to untagged ones (90.0%).

      Monitoring of rematurations (by means of eyestalk tags) showed that among ablated females, 64% spawned once, 35% a second time, and 12% a third time with a maximum of seven spawns from a single female. Uniform spawn sizes characterized first and repeat spawns but hatch rate decreased with each consecutive spawns.