The complete larval development of Chionoecetes japonicus under laboratory conditions

The complete larval development of Chionoecetes japonicus under laboratory conditions

K. Konishi, T. Matsumoto, and R. Tsujimoto

The complete larval development of Chionoecetes japonicus under laboratory conditionsThis is part of Crabs in Cold Water Regions: Biology, Management, and Economics
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Description

Complete larval development of the red snow crab, Chionoecetes japonicus Rathbun, from hatching to crab 1 stage, was observed under laboratory conditions for the first time. The newly hatched zoeae were reared in artificial seawater with a salinity of 35% and under light conditions of 10 light hours and 14 dark hours. The larvae were fed with decapsulated eggs and newly hatched nauplii of Artemia. Green microalgae, Dunaliella teriolecta, 100-500 cells per ml, were also added to cultures. Combinations of three kinds of antibiotics (chloramphenicol, 5 mg per liter; strep-tomycin, 50 mg per liter; and ampicilin, 50 mg per liter) were used for preventing bacterial infections. The crab 1 stage was obtained 118 days after hatching at 8.5-11.0ºC. The crab 1 of C. japonicus is different from the congener C. opilio (Fabricius) in carapace morphology and live color.

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