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Effects of crushed conspecifics on growth and survival of Penaeus monodon Fabricius post larvae
Author(s) -
Nga Bui Tui,
Lürling Miquel,
Peeters Edwin,
Roijackers Rudil,
Scheffer Marten,
Nghia Truong Trong
Publication year - 2006
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.2005.01422.x
Subject(s) - penaeus monodon , biology , zoology , larva , body weight , fishery , ecology , shrimp , endocrinology
In the present study, the hypothesis tested was that Penaeus monodon post‐larvae (PL) experience lower growth when exposed to crushed conspecifics, which was achieved by exposing individual P. monodon PL with abundant food for 4 weeks to a gradient from 0 to 100 crushed conspecific PL L −1 . Both dry weight (48.5±7.2 mg) and body size (28.0±1.3 mm) of animals exposed to 1 macerated PL L −1 were significantly ( P ≤0.011) higher than those of animals in treatments with 0, 5 and 10 crushed PL L −1 (average over treatments: 25.6±3.2 mg; 23.4±0.5 mm). All animals died within 1 week when exposed to 70 and 100 crushed PL L −1 , and within 3–4 weeks when exposed to 50 and 30 crushed PL L −1 . Exposure time affected mortality and it appeared that LC 50 values decreased from 60 to 13 crushed PL L −1 from 1 to 4 weeks' exposure. Survival of P. monodon PL was negatively correlated to pH, biological oxygen demand, ammonia and nitrate. In conclusion, low dose of crushed conspecifics has a stimulatory effect on P. monodon PL, as larvae were heavier and larger, while high doses cause high mortality.