星斑川鲽形态特征及相关参数的观测

Morphological characteristics and parameters measurement of starry flounder(Platichthys stellatus Pallas)

为了给星斑川鲽的分类和种质鉴定提供基础资料，采用传统的形态学和解剖学方法，对人工养殖星斑川鲽的外部形态性状及内部组织器官系统地进行了观测和描述，采用生物统计法对星斑川鲽可量性状进行回归分析。星斑川鲽可量长度性状之间为线性关系，全长与体长回归方程为lt=1．3864lb-0．3035；体重与可量长度性状之间为乘幂函数关系，体重与体长回归方程为m=0．0339lb^3.0606。结果表明不同地方种群间存在明显的形态差异。星斑川鲽的头颅骨骼特征具有鲽形目鱼类的共同特征，在筛骨区和眼区骨骼向有眼侧偏移，尾舌骨呈弓形。左右下咽骨前半部分愈合在一起，下咽齿小；具一对较薄的耳石，有5～6个乳状突。星斑川鲽属“I”型胃，幽门垂有2～4个；解剖的左眼型星斑川鲽肝脏全部在有眼侧，而右眼型星斑川鲽肝脏多在无眼侧，部分在有眼侧。

In order to provide basic information for the taxonomy and species identification of starry flounder （Platichthys stellatus）, the external morphological characteristics and internal tissue and organ system of cultured starry flounder were described and measured using the traditional methods of morphology and anatomy. Regression analysis of starry flounde＇s measurable morphological parameters was done by bio-statistics, which shows a significant linear correlationship. The equation of total length （/t） and body length （lb） was lt = 1. 386 4/b-0. 303 5; the relation of body length and body weight（m）presents power function correlation and their general correlation equation was m=0. 033 9lb^3.0606. These results indicate that distinct morphological differences exist between different geographic populations. The skull of Platichthys stellatus has the common characteristic of Pleuronectiformes, especially ethmoidal region and orbital region shifting to the side of eyes, urohyal bone is bow shape. The front half part of hypopharyngeal is grown together, pharyngeal tooth is small; there are a pair of thin otolith with 5-6 processus mammillaris. Platichthys stellatus has a stomach with ＂I＂ shape, 2-4 pyloric caecums. The liver lies on the side of eyes in the left-eyed Platichthys stellatus. On the contrary, the liver lies on the blind side in the righteyed ones.