淮河水系沙塘鳢形态生物学和繁殖力

Morphological biology and fecundity of Odontobutis obscura in Huaihe River water system.

分析了淮河水系沙塘鳢（Odontobutis obscura）的外部形态特征和框架特征及其繁殖力，为其形态种质标准和系统分类研究提供参考。结果表明：可数性状，背鳍Ⅶ，Ⅰ-9～10，尾鳍14～15，臀鳍Ⅰ-7～8，腹鳍Ⅰ-5，胸鳍14～15，纵列鳞36～41，横列鳞14～18，体侧感觉乳突线鳞28～30，第一鳃弓鳃耙数9～11，脊椎骨数28～29；可量性状，平均全长是体长1．23倍，体长分别是体高、头长、尾柄长、消化道长和肠长的3．82倍、3．08倍、5．19倍、1．86倍和6．99倍，头长分别是吻长、眼径、眼间距和口裂宽2．94倍、6．09倍、3．86倍和1．94倍，体高是体宽0．96倍，尾柄长是尾柄高1．66倍。肥满度系数K=2．90；平均个体绝对繁殖力3288粒，体质量相对繁殖力102．3粒·g^-1，体长相对繁殖力308．7粒·cm^-1。平均成熟系数雌鱼为12．87％，雄鱼为1．13％。

This paper investigated the morphological character, framework, and fecundity of Odontobntis obscura in Huaihe River water system, aimed to provide references for the morphological germplasm criteria and phylogenesis study of the fish. The results showed that in countable characters, the O. obscura in the water system had dorsal fin （D） Ⅶ, Ⅰ -9-10, caudal fin （C） 14-15, anal fin （A） Ⅰ -7-8, ventral fin （V） Ⅰ -5, pectoral fin （P） 14-15 rays, longitudinal scales 36-41, transversal scales 14-18, scales on lateral sensory papillae line 28-30, gill rakes on first gill arch 9-11, and vertebras 28-29. In measurable characters, the total length was 1.23 times of body width, and body length was 3.82 times of body width, 3.08 times of head length, 5. 19 times of caudal peduncle length, 1.86 times of alimentary canal length, and 6. 99 times of intestine length. The head length was 2. 94 times of snout length, 6.09 times of eye diameter, 3.86 times of interorbital distance, and 1.94 times of mouth breadth. Body length was 0. 96 times of body breadth, and caudal peduncle length was 1.66 times of caudle peduncle width. The fatness index was 2. 90. On average, the absolute fecundity, relative fecundity to body length, and relative fecundity to body mass were 3 288 eggs, 308. 7 eggs ·cm^-1, and 102. 3 eggs·g^-1, and the maturity indices for female and male were 12. 87% and 1.13% , respectively.