Four cross combinations of different YY male and female Nile Tilapia Oreochromis niloticus strains were evaluated for growth, sex, and color segregation. Red color parental strains included blotched phenotypes. The Genetically Improved Farmed Tilapia (GIFT) was the only dark (wild‐type) color parental strain. Fish of the same age and cross were stocked in three replicate tanks for four crosses in one recirculating system for 167 days. Data recorded included feed consumed, body weight, total length, color, sex, and fillet weight. YY males crossed with GIFT females (Cross 2) exhibited superior growth that was significantly different (p < .05) to other three crosses. Male proportions were 79–100%. Only YY males crossed with the LSA female strain (Cross 4) yielded 100% males, but, Cross 4's productivity was inferior to that of Cross 2. Body weight advantage of males over females was 28.7–84.2%. Color segregation indicated that red color trait in Nile Tilapia is autosomal dominant, and black patch coverage was variable. This study showed that different parental strain combinations clearly impact productivity traits, and that YY male technology combined with crossbreeding provide the opportunity for genetic improvement and development of commercially beneficial superior traits in Nile Tilapia.

中文翻译：

---

在不同性别的XX雌性和YY雄性尼罗罗非鱼的四种交叉组合中评估生长，性别（男性比例；性二态性）和颜色偏析

评价了不同YY雄性和雌性尼罗罗非鱼尼罗罗非鱼菌株的四个交叉组合的生长，性别和颜色偏析。红色的亲本菌株包括斑点状表型。基因改良养殖罗非鱼（GIFT）是唯一的深色（野生型）亲本菌株。将相同年龄和杂交的鱼在一个循环系统中放到三个重复的水箱中，进行四个杂交，共进行167天。记录的数据包括饲料消耗，体重，总长，颜色，性别和鱼片重量。YY雄性与GIFT雌性杂交（2号杂交）表现出明显不同的优越生长（p <.05）到其他三个十字架。男性比例为79–100％。只有YY雄性与LSA雌性品系（4号杂交）杂交，才能获得100％的雄性，但是Cross 4的生产力低于Cross2。雄性的体重优势是女性的28.8％至84.2％。颜色偏析表明尼罗罗非鱼的红色性状是常染色体显性遗传，黑色斑块的覆盖范围是可变的。这项研究表明，不同的亲本菌株组合明显影响生产力性状，YY雄性技术与杂交育种为尼罗罗非鱼的遗传改良和商业有益优良性状的发展提供了机会。