Individual fecundity of chameleon goby Tridentiger tigonocephalus in Yangtze estuary
CHEN Li-hui, ZHANG Long-zhen, FENG Guang-peng, ZHUANG Ping ZHAO You
1. East China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Key and Open Laboratory of Marine and Estnarine Fisheries, Ministry of Agriculture, Shanghai 200090 ,China; 2. College of Life Selenee and Technology, Dalian Fisheries University, Dalian 116023 ,China; 3. College of Aqua- life Science and Technology, Shanghai Fisheries University, E- institute of Shanghai Municipal Education Commission, Shanghai 200090, China
Abstract: The individual fecundity of chameleon goby Tridentiger trigonocephalus （Gill） and the relationship between the individual fecundity and the biological character indexes were studied. The results showed that relationship between individual absolute fecundity （F）varying from 6 264.5 to 23 587.2 eggs and body length（L）and net body weight（ Wn ） was expressed in quadratic function. The individual absolute fecundity was exponentially correlative to ovary weight（Q） and no significant relativity with gonadosomatic index and condition factor. The individual relative fecundity （ FL） varied from 107.1 to 337.0 eggs/mm, dependent mainly on the body length, net body weight and ovary weight. The individual relative fecundity （Fw ） varied from 1611.2 to 5623.8 eggs/g body weight, dependent largely on the body length, net body weight and gonadosomatic index（G）. The equations were expressed as the following： F = 5185. 326 - 76. 501L ＋ 3. 237L^2 （ R = 0. 657 ）, F = 6300. 372 ＋ 863. 948Wn ＋ 172. 25 W2 （R = 0. 732）, F = 6472. 5e^0.519Q （R = 0. 598 ）, FL = 204. 098 - 1. 723L ＋ 0. 029L^2 （ R = 0. 298 ）, FL = 176. 063 - 1. 984Wn ＋2. 272W2（R =0. 440） ,FL =99. 654 ＋ 109. 137Q - 17. 124Q2 （R =0. 462） ,Fw = 15593. 38 -364. 455L ＋2. 623L^2 （R =0. 467） ,Fw =6118. 327 - 1195. 697Wn ＋ 111.559Wn^2（R =0. 474） ,Fw =3905. 178 - 93. 145G ＋2. 168G2（R =0. 558）. According to the diameter size, the eggs in stage Ⅳ ovary in the goby were divided into two portions. The small eggs ranged from 0.093 to 0.227 mm in diameter,accounting for 17.7%, and the big ones varied from 0.426 to 0.730 mm in diameter, accounting for 82.3%.
2008, Vol. 23 
