Mr.
Title:
Mr.
Keywords:
Abstract:
The study sought to compare the hatching rate of squid (Sepioteuthis sp.) of different batches, using marine water pond and styrofoam boxes with the aim of evaluating its larvae growth and survival in different stocking densities - done in two Phases: Phases 1 (egg hatching in styrofoam boxes and in marine water pond in two treatments with ten replicates and three trials) and Phase 2 ( larvae rearing in pond with three treatment in three replicates). Results noted in this study could only be compared and related to the previous studies under laboratory condition. Observation showed that squid larvae grew slowly throughout the culture period. The low hatching rate in pond was due to the poor water quality and unfavorable physico-chemical parameters. T-test comparison for hatching rate in three trials showed significant difference among treatments. Analysis of variance for the specific growth rate of squid in terms of weight and lenght showed no significant different (p<0.05) among treatments. All throughtout the duration of the expirement, not all physico-chemical parameters of water were within the tolerable range. The temperature of 34°C in the afternoon and salinity range of 37-40 ppt may have caused the poor hatching rate and mass mortality of the larvae. Results indicated that, in Phase 1, Treatment I (egg hatching in styrofoam boxes) was better than TReatment II (egg hatching in pond). This means that squid eggs attained a good hatching rate when hatched in styrofoam boxes, while in Phase 2, the different stock densities showed no significant effect to the growth and survival of squid.??
Objectives:
Aimed to compare the hatching rate of Sepioteuthis sp. Of different batches, in marine water pond and styrofoam boxes; evaluate its larval growth and survival in different stocking densities, in marine water pond, and relate the effects of some water physico-chemical parameters on the growth and survival of its larvae.
Methods:
Randomized Complete Block Design (RCBD)
Findings and Results:
It was observed that the squid larvae grew slowly throughout the culture period. This is in contrast to findings by Albert et all (1996) in their preliminary study on hatching and larval rearing of squid in the hatchery-showing that the squid fed with tilapia fry attained a final weight of 10.115 grams after 45 days culture. In this experiment, the larvae were reared in an aquarium with stocking density of 80 larvae per uni and temperature range of 24-29°C. It was noted that the poor growth of squid in this study could have attributed to the poor quality of pond water and its unfavorable level of some physico chemical parameter. Treatment II gave the highest survival (41.07%) followed by Treatment I (28.33%) and then Treatment III (19.17%), the lowest was on the 30th day culture. However , survival became lower on Treatment III which decreased by (1.67%), Treatment II (1.11%) and Treatment I, (0%) on the 45th day.
Conclusion:
T-tst comparison for hatching rate in three trials showed significant difference among treatment. Analysis of variance for the specific growth rate of squid in terms of weight and length showed no significant difference (p<0.05) among treatment. Survival rate was highest in Treatment II at 41.07% followed by Treatment I at 28.33% and Treatment III the lowest 19.17% on the 30th day. However, on 60th day, 0% survival rate was recorded in all treatment. Result indicated that, in Phase I, Treatment I (egg hatching in styrofoam boxes) was better than Treatment II ( egg hatching in pond). This means that squid eegs attain a good hatching rate when hatched in styrofoam boxes, while in Phase 2, the different stock densities showed no significant effect to the growth and survival of squid. What was evident in this study was that the temperature and salinity of water were not within the tolerable range for squid.
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