The gonad development of laboratory-reared and wild amphioxus (Branchiostoma japonicum) was observed respectively using histological method in Nov. 2009 and Jan., Mar., May, and Jul. of 2010. The results showed that there were no significant differences in total length and body weight among individuals in the two groups of samples (P>0.05), except for the body weights in the reproduction period of July 2010. The gonad development of laboratory amphioxus was basically consistent with that of the wild ones in most months. The ovaries of all laboratory-reared female amphioxus in May 2010 were in Phase Ⅳ, while half of the wild female amphioxus were still in Phase Ⅲ. In the same period, the testis development of laboratory-reared amphioxus was also faster than that of the wild ones. The reason could be the much lower temperature in natural seawater than in indoor seawater in that month. Relative to open sea complex environment, indoor condition is much more stable. However, whether long-term cultivating amphioxus under indoor condition is suitable or not needs further study.
MA De-you
,
YOU Feng
,
WEN Ai-yun
,
TAN Xun-gang
,
XU Yong-li
,
ZHANG Li-jing
,
ZHANG Pei-jun
. A comparison of gonad development between laboratory-reared and wild Branchiostoma japonicum[J]. Journal of Tropical Oceanography, 2013
, 32(4)
: 78
-83
.
DOI: 10.11978/j.issn.1009-5470.2013.04.012
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