文章摘要
狼鳗的外部形态、消化系统和生殖系统的观察
Morphological characteristics digestive system and reproductive system observation of the wolf-eel (Anarrhichthys ocellatus)
投稿时间:2020-02-11  修订日期:2020-03-12
DOI:
中文关键词: 狼鳗  外部形态  可数可量性状  内部结构
英文关键词: Anarrhichthys ocellatus, morphometic characters, meristic and metric characters, internal structure
基金项目:资助项目:引进国际先进农业科学技术计划(948计划,2014-Z11);中国水产科学研究院基本科研业务费专项资金(2012A0701)。[This work was supported by Basal Research Fund,Chinese Academy of Fishery Sciences(2012A0701).The Scientific and Technological Project was supported by International Advanced Agricultural Science and Technology Program(Plan 948,2014-Z11]
作者单位E-mail
刘宇岩 中国水产科学研究院黄海研究所 157107719@qq.com 
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中文摘要:
      采用观察、测量、解剖和拍照的方法,对狼鳗(Anarrhichthys ocellatus)的外部形态、可数可量性状以及消化系统、生殖系统进行了研究分析,描述了狼鳗的相关特征。结果表明:(1)狼鳗体型为鳗形,整体呈黑色或者灰黑色,头部、背部及背鳍鳍条上有若干似眼睛的黑色圆斑,体表无鳞。(2)背鳍鳍条数232-267,胸鳍鳍条数15-22,臀鳍鳍条数189-220,无腹鳍,背鳍和臀鳍因与尾鳍相连而无明显区分界限,侧线左右各两条,均不完整,雄性侧线点明显,而雌性侧线点不明显。上排侧线点数18-25,下排侧线点数76-85。上鳃耙数49-70,下鳃耙数55-73,脊椎骨数232-271。(3)全长/体长线性相关性最好,雌雄差异也很小,稳定性最好。头长/吻长、头长/眼径、体长/肠长的变动范围较大,雌雄间差异较大,线性相关性也差,可以作为区分狼鳗雌雄的一个重要的特征;狼鳗体重与体长关系为W=0.0337Sl2.4798(R2=0.9992),雌性W=0.0326Sl2.4864(R2=0.9990),雄性W=0.0359Sl2.4672(R2=0.9995)。(4)消化系统由消化道和消化腺构成,口咽腔大,具颌齿,无腭齿、犁齿,咽喉齿发达;胃大,呈“I”型,无幽门盲囊;肠短粗,比肠长为0.45;相关性状及特征显示狼鳗为肉食性鱼类。(5)雌雄异体,卵巢(Ⅲ-Ⅳ )呈椭圆形,粉红色,左右对称,精巢(Ⅲ-Ⅳ )呈黄白色,“Y”形。
英文摘要:
      By observing, measuring, anatomizing, photographing the external shape, meristic and metric characters , digestive system and reproductive system of the Anarrhichthys ocellatus were observed and described. The results are as follows: the body type of the A. ocellatus is anguilliform, the skin color is black or rubricans without any mackerel scale,there are a number of dollar spot like eyes on the head, black and dorsal fin. The number of the dorsal fin, pectoral fin and anal fin were 232-267, 15-22 and 189-220, respectively. A. ocellatus have no ventral fin, and the tail fin is linked with dorsal fin and pectoral fin so that we can’t tell them apart. There are two incomplete lateral line on each sides, the upper is 18-25 and the lower is 76-85. The female lateral line is distinct. However, the male is not. A. ocellatus also have no pyloric caeca, and the number of the upward gill rakers, downward gill rakers and vertebrae are 49-70, 55-73 and 232-271, respectively. Besides, the variation magnitude of total length/standard length is small with little difference between female and male. The values of the Head length / Proboscis length, Head length / Eye diameter and Standard length / Intestine length not only vary largely but present the worst in linear correlation with great difference in female and male. Therefore, the female and male can be distinguished .The relationship between weight and length:W=0.0337Sl2.4798(R2=0.9992), for female, W=0.0326Sl2.486( R2=0.9990);for male,W=0.0359Sl2.4672(R2=0.9995). The digestive system consists of the digestive tract and the digestive glands,the Oropharyngeal cavity is big; A. ocellatus have jaw teeth, without cavities and plow teeth, the pharyngeal teeth were well-developed ,the stomach with “I” shape is big and have no pyloric caeca;The intestine is wide and short.the ratio of intestine length/total length is 0.45.The related traits and characteristics showed that the A. ocellatus was a carnivorous fish.A. ocellatus is hermaphrodite;the shape of theovaries(Ⅲ-Ⅳ)is ellipse and the color of the ovaries is pink .ovaries is left-right symmetrical.The shape of the testis(Ⅲ-Ⅳ)is“Y”and the color of the testis(Ⅲ-Ⅳ)is pink
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