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Toxicity of ammonia to the larvae of Penaeus indicus H. Milne Edwards

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Relation http://eprints.cmfri.org.in/474/
 
Title Toxicity of ammonia to the larvae of Penaeus indicus
H. Milne Edwards
 
Creator Jayasankar, P
Muthu, M S
 
Subject Prawn and Prawn fisheries
 
Description Short-term experiments revealed a progressive increase in tolerance of the
larval stages of Penaeus indicus to ammonia. 24-h LC30 values for nauplius, protozoea
and mysis were 3.58 mg ammonia N/l (0.29 mg NH3-N/I), 17.86 mg ammonia-
Nil (0.95 mg NHyN) and 46.01 mg ammonia-Nil O.lTmgNHj-N/I). respectively.
48-h LCjo value for protozoea was 16.8 mg ammonia-N per liter (1.18 mg
NH3-N/I. Long-term chronic-toxicity experiments on nauplius to postlarva-1
showed that the 9-day incipient LCjo level was 11.99 ppm of ammonia-N{l (0.93
ppm NH3-N). The ECjo (the concentration at which the percentage of larvae
that metamorphosed to postlarvae was reduced to 50% of that of the controls)
for ammonia was 3.23 ppm ammonia-N11 (0.25 ppm NH3-N). "Safe level"
of ammonia that should be maintained in the sea water used for larval rearing
was calculated on the basis of incipient LC50 value as 1.2 mg ammonia-N/!
or 0.093 ppm NH3-N/I. More sensitive estimate of "safe level" based on EC 50
value was 0.32 ppm ammonia-N|! or 0. 25 ppm NH3-N.
 
Publisher CMFRI/ICAR
 
Date 1983
 
Type Article
PeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/474/1/Article_02.pdf
Jayasankar, P and Muthu, M S (1983) Toxicity of ammonia to the larvae of Penaeus indicus H. Milne Edwards. Indian Journal of Fisheries, 30 (1). pp. 1-12.