摘要: |
于1991年4月,从长江口采集葛氏长臂虾标本,在实验室进行幼体发育研究。结果表明,幼体自孵出后,在水温24°C、盐度12、饵料充足的条件下,有规律的每2天蜕皮1次,共经11次蜕皮,约22d完成变态,入仔虾期。 |
关键词: 葛氏长臂虾 蚤状幼体 仔虾 蜕皮 变态 |
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THE LARVAL DEVELOPMENT OF PALAEMON GRAVIERI (YU) |
Liang Xiangqiu, Zhou Zhaoman
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Department of Aquaculture, Shanghai Fisherics University, Shanghai 200090
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Abstract: |
This present paper describes the larval development of Palaemon gravieri. which lives in the shallow sea and estuaries and is of commercial importance in China. Under 22°C of temperature and salinity of 12 it takes about 22 days for larvae to metamorphose to postlarval stage. Larval development may be divided into 11 zoal stages.
lst stage: The carapace has pterygostomian spines. The eyestalk is fused with carapace. Abdomen comprised of 6 segments, lst and 2nd pereiopods are biramous rudiments. 2nd stage: Rostrum has supra-orbital spines, eye stalks movable, dorsal projection of the 3rd abdomenal segment bears a hook, 5th abdomenal segment has a large spine on each side. The 3rd pereiopod is birarnous rudiment, 5th pereiopod is monotype. 3rd stage: Rostrum has two dorsal teeth, carapace has branchiostegal spines, 6th abdomenal segment is separated with telson, uropod is biramous. 4th stage: Rostrum has 3 dorsal teeth, 3rd and 5th pereiopods are segmented. 5th stage: The 4th pereiopods are segmented. 6th stage: The bud of the pleopod may be seen. 7th stage: The pereiopod of the 1st and 2nd are distinctly chelae, pleopods are biramous. 8th stage: The pleopods are segmented. 9th stage: The 2nd to 5th pleopods bear appendix interna. 10th stage: A hook on the 3rd abdomenal segment disappears. The telson bears 2 pairs of dorsal spines and 2 pairs of posterior spines. 11th stage: The inner flagellum of the antennula has 7 - 9 segments.
The postlarval stage: 9 - 10 teeth on the dorsal border of the rostrum, 1 - 2 teeth on the ventral border. The carapace has antennal and branchiostegal spines, pterygostomian spine disappears. |
Key words: Palaemon gravieri, Zoea, Postlarva,e Moult, Metamorphosis |