关键词: 荷那龙罗非鱼, 橙色莫桑比克罗非鱼, 生物学性状, 杂交F₁

Abstract: The principal biology characteristics of O. hornorum and O. mossambicus were studied. The results showed that: ①two species could be distinguished clearly, the O. hornorum was dark with longitudinal striation, body shape was spindle. And O. mossambicus was orange without longitudinal striation, body shape was dolicho-shuttle. ②the minimal maturity age of them were both six months, their minimal maturity body-length were 8.64 cm and 6.60 cm, respectively, absolute fecundity were 810 for the former and 702 for the latter. ③when the water temperature ranged between 16℃ and 32℃, the oxygen consumption rates of O. hornorum (weight 10.40~116.28 g) were 0.07~0.61 mg/(g·h), while that of O. mossambicus (weight 18.98~102.53 g) were 0.06~0.43 mg/(g·h). The asphyxiation points were 0.33~0.55 mg/L for the former, 0.31~0.45 mg/L for the latter at 24℃. ④The MLS-96 (median lethal salinity-96 hours) values were 21.56 for O. hornorum and 22.29 for O. mossambicus. They all could withstand high salinity. ⑤The lethal temperatures were 5.1~9.51℃ for O. hornorum and 9.9~8.0℃ for O. mossambicus. Tolerance to lowest temperatures of the former was not good. ⑥Their hybrid F₁ was worthy of being spread with high percentage of male offspring and better growth performance.

Key words: Oreochromis hornorum, Oreochromis mossambicus, biological characteristics, hybrid F₁