The Effects of Triploidy Towards Growth Performance, Survival Rate, Gender Ratio and Sex Differentiation on Banana Shrimp, Penaeus merguiensis (De Man, 1888) Postlarvae Compared to Diploid Siblings

Study was done to show the effect of triploidy on growth performance, survival rate and gender ratio on Penaeus merguiensis compared to diploid sibling otherwise identifying the sex external characteristic of the postlarval. Cold shocks (10°C, 15°C and 20°C) with control (28°C) and three different time of exposures (10, 15 and 20 min)were introduced to each treatments. The fertilization rate was significantly different (P <0.05) among treatments and the hatching rate was no significantly different found (P >0.05). Larvae got poor survival rate when reached mysis stage and there was no significantly different (P >0.05) among each treatments. Triploidy were identified in 15°C treatment for all time of exposures and other treatments produced diploid. 15°C treatment and control were reared until postlarval 50 and the survival rate were significantly different (P <0.05). Male shrimps were differentiated by present of petasma and female by appearance of sharp ridges thelycum (srt). For the gender ratio, it was significantly higher differences (P <0.05) where 15°C treatment produced 94% males compared to control that produced 85% females. For growth performance of total length and body weight, there were significantly higher difference (P <0.05) among treatments which 15°C treatment identified gives faster growth towards the treated larvae compared to control. For the relationsips of total length and body weight, there were significantly different at 0.01(2-tailed) between control and triploid treatments, even though have a quite similar proportional for each treatments. The Specific growth rate obtained were also identified significantly different (P <0.05) between control and the 15°C treatment.