三疣梭子蟹的幼体发育

THE LARVAL DEVELOPMENT OF PORTUNUS TRITUBERCULATUS

摘要:

本文对人工培养的三疣梭子蟹各期幼体作了形态描述。据观察,溞状幼体阶段蜕皮4次;大眼幼体阶段蜕皮1次。在22—25℃的条件下培养,自破膜孵出到变态为第1期幼蟹,需经15—18 天。

Abstract:

This paper presents the observation on the larval development of Portunus trituberculatus under artificial cultivation.Based on the morphological characteristics, the whole process of metamorphosis may be devided into five stages that is, four zoeal stages and one megalopa stage.The number of the feathery setae on the distal potion of the exopodites of the lst and and magillped; the form of the pleopods and the number of the setaes on the caudal concavity may be used as the main features for distinguishing the different zoeal stages.Development from the 1st zoeal stage to the young crab required 15-18 days(the zoeal stage reqired 10-12 day and the megalopa stage required 5-6 days) at the tem-perature 22--25℃ under artifical cultivation.