ISSN 2360-7947
Abstract
This experiment was conducted to investigate the effect of Azanza garckeana on egg fertilization, hatchability and fry survivability of Clarias gariepinus in culture system, for a period of four weeks. The results show that number of fertile eggs and fertilization rate for week 1 to week 4 differs significantly among all the treatment groups (p > 0.05). In the first week, T2 recorded the significantly highest number of fertile eggs (63764.66±7628.54) and fertilization rate (83.00±1.00 %) compared with other treatments (p < 0.05). In week 2, T2 also recorded the significantly highest number of eggs (60117.66±5673.12) while fertilization rate was significantly highest in T5, T2, and T3 (83.33±1.52 %, 81.33±1.52 %, and 81.00±1.99 %) respectively. in week 3 show that number of fertile eggs was significantly highest (57006.66±5929.07) in T2 compared with other treatment groups while fertilization rate was significantly highest (83.38±2.50 %) in T5 as compared with other treatment groups (p < 0.05). In week 4, both T2 and T4 has the significantly highest number of fertile eggs (62802.66±11735.38 and 55282.00±7329.18) compared with other treatment groups, while T5 has the significantly highest fertilization rate (84.66±1.52 %) compared with other treatment groups (p < 0.05). Eggs, hatchability and survival rates differs significantly among all the treatment groups (p > 0.05) in all the weeks studies. In the first week, T2 recorded significantly highest number of hatched eggs (47796.33±5494.90) compared with other treatments while hatchability rate was significantly highest (84.33±1.52 %, 82.53±3.55 %, and 80.76±2.24 %) in T5, T4, and T3 respectively compared with T1 and T2 (p < 0.05). Furthermore, survival rate was significantly highest (100.00±0.00 %) in T4 and T5 respectively and lowest (80.66±2.30 %) in T1. Week 2, the number of hatched eggs was significantly lowest (26954.66±1523.81) in T2 and highest (37067.33±1362.66) in T4. Also, hatchability rate was significantly highest (77.00±1.00 %) in T5 while survival rate was highest (100.00±0.00 %) in T4 and T5 respectively. Week 3 show hatched eggs was significantly highest (34794.00±3966.94) in T2 compared with other treatment groups while hatchability rate was significantly highest (72.66±1.52 % and 67.66±1.52 %) in T5 and T4 respectively as compared with other treatment groups (p < 0.05). Survival rate of week 3 showed similar trend with that of week 1 and 2 respectively. In week 4, both T2 and T4 has significantly highest number of hatched eggs (34417.00±8211.90 and 32159.33±5687.53) respectively compared with other treatment groups, while T5 has the significantly highest hatchability rate (69.38±4.45 %) compared with other treatment groups (p < 0.05). Survival rates of T2, T3, T4 and T5 did not differ significantly (p > 0.05).
Keywords: Azanza garckeana, Egg fertilization, Hatchability, survivability, Clarias gariepinus