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Effects of light intensity, stocking density and temperature on the air‐bubble disease, survivorship and growth of early juvenile seahorse Hippocampus erectus Perry, 1810
Author(s) -
Lin Qiang,
Lin Junda,
Huang Liangmin
Publication year - 2010
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.1365-2109.2010.02573.x
Subject(s) - juvenile , biology , stocking , zoology , seahorse , growth rate , survivorship curve , light intensity , ecology , genetics , geometry , mathematics , physics , cancer , optics
This investigation examined the effects of light intensity, stocking density and temperature on the air‐bubble disease, survivorship and growth of early juveniles (2–30 days old) of seahorse Hippocampus erectus Perry. The juveniles in the 100 lx treatment had the highest air‐bubble disease rate of 20.8 ± 6.2% and the juveniles in the 500 lx treatment had the highest survival rate of 84.4 ± 5.5%. The juvenile seahorses cultured in the 1500 lx treatment had the highest final wet weight of 0.13 ± 0.02 g and the highest final standard length of 4.54 ± 0.37 cm ( F 7, 144 =57.406, F 7, 144 =12.315, P <0.05). There was no significant effect of stocking density on the air‐bubble disease rate ( F 6, 21 =1.893, P =0.126). The juveniles cultured in the 1 ind L −1 had the highest wet weight increment of 0.134 ± 0.031 g, but juveniles in the 2 ind L −1 had the highest standard length increment of 3.17 ± 0.30 cm ( F 6, 126 =34.902, F 6, 126 =11.726, P <0.05), and juveniles cultured in the 1.5 ind L −1 had the highest survival rate of 86.1 ± 4.6%. The result of interaction of light intensity and temperature showed that the juveniles cultured in the 1500 lx and 26 °C had the highest weight gain and specific growth rate of 3791.17 ± 323.97% and 13.07 ± 0.18, respectively, and the lowest air‐bubble disease rate of 9.3 ± 4.5% occurred in the 1000 lx and 26 °C ( F 8, 36 =12.355, P <0.05).