摘要
利用2010年2月～2012年5月从江苏启东、福建东山、海南海口、广东湛江和台湾沿海海域采集到的192 ind多鳞四指马(鱼友)(Eleutheronema rhadinum)标本,取3对耳石,并以矢耳石长、宽、重、长宽比、面积、周长、矩形趋近率、成形系数、密度等指标为基本形态学参数,研究多鳞四指马(鱼友)的耳石形态特征。结果显示,多鳞四指马(鱼友)矢耳石都有基叶和翼叶,中央听沟明显,前缘开阔,后缘窄且闭合。矢耳石的大小和形状随个体生长变化明显,叉长较短的样品,耳石呈瓜子状,边缘规则;叉长较长的样品,矢耳石呈狭长叶片状,边缘有较多波浪形突起。矢耳石形态特征比较显示:多鳞四指马(鱼友)矢耳石在形态上更接近鲈形目鱼类耳石形态,这支持将多鳞四指马(鱼友)归为鲈形目鱼类。矢耳石平均密度为0.80 mg·mm-3,平均矩形趋近率为0.70,成形系数为0.58,耳石长是叉长的2.82%～3.42%,重量占体重的0.06‰～0.59‰。矢耳石度量指标的变异系数均小于其叉长、体重的变异系数,矢耳石形态的稳定性高于其身体形态的稳定性。多鳞四指马(鱼友)矢耳石长、宽、重、长宽比与叉长呈显著相关,耳石长与宽符合幂函数关系。密度、矩形趋近率、成形系数、耳石长占叉长比、耳石重占体重比等参数可以作为表征参数,来衡量多鳞四指马(鱼友)的形态特征。
A total number of 192 samples of Eleutheronema rhadinum were collected from the coastal waters of Qidong in Jiangsu Province, Dongshan Island in Fujian Province, Zhanjiang in Guangdong Province, Haikou in Hainan Province, Taiwan province from February,2010 to May, 2012. Length, width, weight, perimeter, area, rectangularity, form factor and density of otolith collected were analyzed. The results indicated that all the sagittal otoliths had rostrum and antirostrum with obvious centural notch, and the ostium was wider than the cauda, rostrum and antirostrum. The shape of sagittal otoliths of samples with shorter fork length was likemelon seeds and the outline of the margin was regular, but those with longer fork length showed long and narrow leaf shape with margin bulge like waves. Comparison of sagittal otolith characters between Mugiliformes and Perciformes indicated that： morphology of E. rhadinum sagittal otolith was closer to Perciformes, which supported that E. rhadinumbe belonged to polynemidae, Perciformes. The sagittal otoliths had a length of 2.66% -5.41% of their fork length and a weight of 0.06%v -0.59%e of their body weight. The density, rectangularity, form factor was 0.80 mg . mm-3,0.70 and 0.58, respectively. The morphological stability of sagittal otolith was remarkably higher than that of their body shape. The variation coefficients of the length, width and weight of sagittal otoliths were smaller than those of the fork length and body weight. Sagittal otolith measurements（ otolith length, width, weight, length-width ratio） were significantly related to the standard fork length, and otolith length and the otolith width followed a power function. Density, rectangularity, form factor, OL/FL, OWe/BW can be used as typical characters to measure the body shape of Eleutheronema rhadinum.
出处
《海洋渔业》
CSCD
北大核心
2013年第1期24-33,共10页
Marine Fisheries
基金
中央级公益性科研院所基本科研业务费重点项目(2011Z01)
公益性行业(农业)科研专项(201203065)
关键词
多鳞四指马鲅
耳石
形态特征
度量指标
Eleutheronema rhadinum
otolith
morphological characteristics
measurements
