Ontogenetic development in the morphology and behavior of loach(Misgurnus anguillicaudatus) during early life stages  

作　　者：高雷 段明 程飞 谢松光 

机构地区：[1]Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences,Institute of Hydrobiology,Chinese Academy of Sciences [2]University of Chinese Academy of Sciences [3]Key Laboratory of Sustainable Fisheries and Environmental Protection for Lakes of Northern Jiangsu,Huai'an Research Center,Institute of Hydrobiology,Chinese Academy of Sciences

出　　处：《Chinese Journal of Oceanology and Limnology》2014年第5期973-981,共9页中国海洋湖沼学报（英文版）

基　　金：Supported by the Key Technology Research and Development Program of Huai’an(Nos.SN12100 and SN12101);the Construction of Innovation Carrier and Platform Project of Huai’an for the Key Laboratory of Sustainable Fisheries and Environmental Protection for Lakes of Northern Jiangsu(No.HAP201204);the Special Research Fund for Public Interest of MWR of China(No.201201028-02)

摘　　要：Loach （Misgurnus anguillicaudatus） is a commercially important fish in China and an ideal aquaculture species. However, culturists experience high larval and juvenile mortality during mass production. To provide insight into ways to improve larviculture techniques, we describe the morphological characteristics and behavior of loach during the larval and early juvenile stages. Yolksae larvae ranged from 2.8 to 4.0 mm body length （BL） between days 0 to 4; preflexion larvae ranged from 3.6 to 5.5 mm BL between days 4 to 6; flexion larvae ranged from 4.8 to 8.1 mm BL between days 5 and 14; and post-flexion larvae ranged from 7. l to 15.7 mm BL between days 11 to 27; the minimum length and age of juveniles was 14.1 mm BL and 23 d, respectively. Loach are demersal from hatch through to the early juvenile stages. A suite of morphological characteristics （e.g., external gill filament and ventral mouth opening） and behavioral traits have developed to adapt to demersal living. We observed positive allometric growth in eye diameter, head length, head height, and pectoral fin length during the early larval stages, reflecting the priorities in the development of the organs essential for survival. Our results provide a basis for developing techniques to improve the survival of larval and juvenile loach during mass production.Loach(Misgurnus anguillicaudatus) is a commercially important fish in China and an ideal aquaculture species. However, culturists experience high larval and juvenile mortality during mass production. To provide insight into ways to improve larviculture techniques, we describe the morphological characteristics and behavior of loach during the larval and early juvenile stages. Yolksac larvae ranged from 2.8 to 4.0 mm body length(BL) between days 0 to 4; preflexion larvae ranged from 3.6 to 5.5 mm BL between days 4 to 6; flexion larvae ranged from 4.8 to 8.1 mm BL between days 5 and 14; and postflexion larvae ranged from 7.1 to 15.7 mm BL between days 11 to 27; the minimum length and age of juveniles was 14.1 mm BL and 23 d, respectively. Loach are demersal from hatch through to the early juvenile stages. A suite of morphological characteristics(e.g., external gill filament and ventral mouth opening) and behavioral traits have developed to adapt to demersal living. We observed positive allometric growth in eye diameter, head length, head height, and pectoral fin length during the early larval stages, reflecting the priorities in the development of the organs essential for survival. Our results provide a basis for developing techniques to improve the survival of larval and juvenile loach during mass production.

关 键 词：behavioral features larvae and juveniles morphological development Misgurnus anguillicaudatus 

分 类 号：S966.4[农业科学—水产养殖]