真鲷早期发育阶段行为生态学研究

真鲷Pagrosomus major Temminck et Schlegel早期发育阶段游泳行为的发育可以分为:(1)旋转式运动;(2)阶梯型运动;(3)间断式水平运动和滑翔;(4)巡游以及(5)疾游五种类型。前期仔鱼的摄食方式主要是伴有甩头动作的前冲摄食;后期仔鱼的摄食主要有两种类型:一种是身体弯成S形的“S攻击型”;另一种为不作摄食姿势的“咬食攻击型”。摄食方式随着发育水平和饵料种类的不同而异。文中对发育过程中出现的攻击行为、护食行为、互食行为、猝死现象亦进行了描述。并对游泳、摄食以及各种行为的生态意义和实际意义进行了讨论。

A STUDY ON BEHAVIOUR ECOLOGY OF THE EARLY LIFE STAGES OF RED SEA BREAM (Pagrosomus major)

In this paper, detailed experimental observations were dealt mainly with the development of swimming and feeding behaviour of the early life stages of red sea bream (Pagrosornus major). There were five types of movements at different developmental stages: (1). rotating movement; (2). ladderwise swimming; (3). intermittent horizontal swimming and gliding; (4). cruising and (5). speeding. The prelarvae struck at the prey with head swinging. There were two types of feeding behaviours in the postlarvae and juveniles: "a S-posture attack" with a sinuous posture while feeding, and "a biting attack" without a sinuous posture. The types of feeding differed with the development level of larvae and prey type, etc. . Finally, the ecological and practical significances of swimming, feeding and other behaviours were discussed.