文章摘要
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
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
投稿时间:2017-04-18  修订日期:2017-08-21
DOI:10.11964/jfc.20170410803
中文关键词: 蛇鮈  肠道  形态结构  异速生长  摄食频率
英文关键词: Saurogobio dabryi  intestine  morphological structure  allometric growth  feeding frequency
基金项目:国家自然科学基金(51779210);四川省科技厅重点项目(2016JY0097);四川省教育厅重大培育项目(自然科学)(17CZ0035)
作者单位E-mail
张臣 西华师范大学生命科学学院, 四川 南充 637000  
曾燏 西华师范大学生命科学学院, 四川 南充 637000
西南野生动植物资源保护教育部重点实验室, 西华师范大学, 四川 南充 637000 
biologyfe@gmail.com 
彭艳 西华师范大学生命科学学院, 四川 南充 637000  
蒋朝明 西华师范大学生命科学学院, 四川 南充 637000  
胡月 西华师范大学生命科学学院, 四川 南充 637000  
龚建涵 西华师范大学生命科学学院, 四川 南充 637000  
杨少荣 中国三峡建设管理有限公司, 四川 成都 610041  
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中文摘要:
      对2015—2016年间采自嘉陵江下游合川江段的233尾蛇鮈样本进行肠道形态结构的研究,分析蛇鮈肠道生长模式的特点,并从功能差异的角度探讨其对个体能量需求的适应。结果显示,蛇鮈肠道为Z型盘曲模式,比肠长(RGL)为0.612 8,属肉食性鱼类肠道类型;蛇鮈肠道可分为前肠、中肠和后肠3个分区,各分区在外部形态、内部结构以及肠道指数方面均存在较为明显的差异。Segmented结果分析表明,蛇鮈肠道属异速生长,整体肠道于2龄时出现生长拐点(TL=145.07 mm),拐点前为快速生长,拐点后为等速生长。同时,肠道各分区的生长模式不尽相同,前肠和中肠始终保持等速生长,仅后肠从快速生长经拐点转换为等速生长。蛇鮈肠道各分区生长模式的差异可能与其功能分化有关,在拐点前,蛇鮈通过后肠的快速增长来提高摄食频率,从而满足其大量的能量需求。本研究不仅能为今后开展蛇鮈的人工养殖提供重要理论依据,同时为探讨鱼类肠道异速生长与食性间关系进行了有益的尝试。
英文摘要:
      To study the intestinal structure characteristics and the relationship with its growth pattern of Saurogobio 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 midintestine 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 corresponding 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 respectively; 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 demand for energy during the initial growth stage. The results obtained from this research can not only provide important scientific evidence for artificial cultivation of S. dabryi, but also offer a new example for studying the relationship between the growth pattern of fish intestine and its feeding habits.
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