Many aquarium fish species have diverse morphotypes. Since different morphotypes may have different preferences for various prey items, offering a single prey species is inadequate for successful aquaculture. Poecilia reticulata, a popular aquarium species, occurs in different morphotypes. To test whether the four morphotypes (yellow tail YT, red tail RT, metallic blue tail MBT and black tail BT) of this fish prefer different items, we quantified somatic growth, feeding behaviour, zooplankton selectivity and functional responses. Standard length (4.5 vs. 11.7 mm) and gape size (0.37 vs. 0.91 mm) of four morphotypes increased linearly with larval age; YT and RT had 25% longer body length and larger gape than the others. Prey encounters, attacks, captures and ingestions increased with larval age. Lowest ingestion rates were recorded for the RT morphotype on rotifers. At any given larval age, prey consumption increased with increasing prey availability. During the fourth and fifth weeks, larval YT and RT consumed higher number (37 ± 1 ind./predator/30 min) of cladocerans compared with other two morphotypes (24 ± 1 ind./predator/30 min). Prey selectivity data showed that larvae of MBT and BT continued to prefer rotifers up to 4 weeks, while those of YT and RT preferred cladocerans during the 4th week.

中文翻译：

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孔雀鱼Poecilia reticulata Peters的形态型依赖性摄食反应，1859年（类：放线opter纲）摄食浮游动物

许多水族馆鱼类具有不同的形态型。由于不同的形态型对各种猎物可能有不同的偏好，因此仅提供一个猎物种类不足以实现成功的水产养殖。网纹Poecilia，一种流行的水族馆物种，以不同的形态发生。为了测试该鱼的四种形态类型（黄色尾巴YT，红色尾巴RT，金属蓝色尾巴MBT和黑色尾巴BT）是否喜欢不同的鱼类，我们量化了体细胞的生长，摄食行为，浮游动物的选择性和功能性反应。四种形态型的标准长度（4.5比11.7毫米）和缝隙大小（0.37比0.91毫米）随着幼虫年龄的增加而线性增加。YT和RT的身长比其他人长25％，差距更大。随着幼体年龄的增长，猎物的遭遇，攻击，捕获和摄取都增加了。轮虫的RT形态记录的最低摄取率。在任何给定的幼体年龄下，猎物的消耗都随着猎物可用性的增加而增加。在第四周和第五周，幼虫的YT和RT消耗的数量更高（37±1 ind。/捕食者/捕食者/ 30分钟）与其他两种形态型（24±1 ind./捕食者/ 30分钟）相比。猎物的选择性数据显示，在第4周内，MBT和BT的幼虫继续偏爱轮虫，而YT和RT的幼虫在第4周内偏爱锁骨。