Short communication: The effect of different pH and photoperiod regimens on the survival rate and developmental period of the larvae of Portunus pelagicus (Decapoda, Brachyura, Portunidae)

Crustacean larval development occurs within a narrow range of environmental parameters. Among the abiotic characteristics that influence the developmental period and survival rate of the larvae, pH and photoperiod are of great importance. High and low levels of pH are known to adversely affect the physiology of the animals due to the increased amounts of ammonia and nitrite. High values and sudden fluctuations in pH are found to cause disease outbreaks and stress, respectively in crustacean larvae. A pH around 8.5 was found to be the optimum for larval rearing of the mud crab Scylla paramamosain. Another important parameter that decides the survival and developmental period of crustacean larvae is the period of exposure to light or darkness. ... The studies on the effect of these parameters on the larvae of P. pelagicus from Indian waters are meagre. The present study attempts to trace out the effects of pH and photoperiod on the survival rate and developmental period of the larvae of P. pelagicus from the south-east coast of India. The study also attempts to find out the optimal range of these parameters for each larval stage.

Bibliographic Details

Main Authors:	Ravi, R., Manisseri, M.K.
Format:	article biblioteca
Language:	English
Published:	2013
Subjects:	Biology, Environment, Fisheries, Portunus pelagicus, Photoperiod, Larval rearing, Larval development, Larval survival, Decapoda, Brachyura, Portunidae, India, Kochi,
Online Access:	http://hdl.handle.net/1834/37376
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