水产学报2018，Vol.42Issue(4)：503-512,10.DOI:10.11964/jfc.20170410803
嘉陵江下游蛇鮈肠道形态结构及其异速生长模式
Morphological structure and allometric growth pattern of Saurogobio dabryi intestine in the lower reaches of Jialing River
摘要
Abstract
To study the intestinal structure characteristics and the relationship with its growth pattern of Saurogo-bio dabryi,a total of 233 individuals were collected from the lower reaches of the Jialing River(Hechuan section) from 2015 to 2016.Morphological observation results showed that the intestinal structure of S.dabryi was Z-shaped, and belonged to carnivorous fish gut according to its relative short gut length (RGL) index (0.612 8). Based on its morphological structure, the intestine could be divided into three parts, the foreintestine, the midintest-ine and the hindintestine, with obvious difference in external morphology, internal structure and intestinal index. The growth pattern of S.dabryi intestine was allometry,with 2-year growth inflexion age and 145.07 mm corres-ponding fish total length (TL). Before and after the inflection point, there was different growth pattern of intestine, i.e.,from the fast growth stage to slow growth stage.Meanwhile,the growth pattern of intestine was different between each part. In addition, the results of segmented analysis with R software showed that all of the inflexion points among three parts appeared at the age of 2 years, and their TL were 126.00 mm, 169.00 mm, 148.16 mm re-spectively; there were obvious differences in intestinal growth pattern among the three parts, with isokinetic growth in the foreintestine and the midintestine, but with significant allometric growth in the hindintestine, which had a fast growth stage before growth inflexion point and then changed to isokinetic growth pattern, based on the growth indices difference analysis between two stages.Thus,the difference of growth pattern of S.dabryi among the three parts of intestine might be related to their functional differentiation. Before the inflection point, the S. dabryi might improve their feeding frequency by the fast growth stage of the hindintestine,to meet the great de-mand for energy during the initial growth stage. The results obtained from this research can not only provide im-portant scientific evidence for artificial cultivation of S.dabryi,but also offer a new example for studying the rela-tionship between the growth pattern of fish intestine and its feeding habits.关键词
蛇/肠道/形态结构/异速生长/摄食频率Key words
Saurogobio dabryi/intestine/morphological structure/allometric growth/feeding frequency分类
农业科技引用本文复制引用
张臣,曾燏,彭艳,蒋朝明,胡月,龚建涵,杨少荣..嘉陵江下游蛇鮈肠道形态结构及其异速生长模式[J].水产学报,2018,42(4):503-512,10.基金项目
国家自然科学基金(51779210) （51779210）
四川省科技厅重点项目(2016JY0097) （2016JY0097）
四川省教育厅重大培育项目(自然科学) (17CZ0035)National Natural Science Foundation of China (51779210) （自然科学）
Major Project of Science and Tech-nology Agency of Sichuan Province, China (2016JY0097) （2016JY0097）
Major Cultivation Project of Education Department of Sichuan Province, China (17CZ0035) （17CZ0035）
