摘 要:
于5月份团头鲂正常繁殖期前夕，以初次性成熟（二足龄）二倍体团头鲂为对照样本，同龄同池培育的同源倍间正交三倍体、同源倍问反交三倍体、异源倍间杂交三倍体为实验样本，分别取性腺，石蜡切片，镜检发育状况。发现团头鲂三倍体的性腺可归纳为三种情况：（1）性腺发育程度很低，表现为雄性二足龄三倍体的性腺外观细小，生殖细胞处于精原细胞水平。（2）性腺发育出现异常，表现在性腺外观畸形，有卵巢单侧不发育，有精巢大部分为细线，局部增粗等情况，还有发现外观无异常，但切片观察为雌雄嵌合体。（3）性腺发育无异常，表现为性腺外观没有异常，切片观察也能观察到各期典型的生殖细胞。[著者文摘]
文章出处:
《上海水产大学学报》-2008年1期 -1-5页
分 类 号:
文献标识码:
A
文章编号:
1004-7271（2008）01-0001-05
Primary report of observation on the diversity of gonad development in the triploid of blunt snout bream （Megalobrama amblycephala） crossbred by tetraploid and diploid
TIAN Gang, LI Si-fa （ Key Laboratory of Aquatic Genetic Resources and Aquaculture Ecosystem Certificated by the Ministry of Agriculture, Shanghai Fisheries University, Shanghai 200090, China）
Abstract:
Just before the normal reproduction period of the blunt snout bream （Megalobrama amblycephala） in May, the gonad samples were collected from the first matured two-year-old diploid as control group, and from the communal raised triploid （ crossbred by tetraploid and diploid, including auto-positive-triploid, autonegative-triploid, allo-triploid） as checking group, gonads were sliced and observed under microscope. The gonad development of the gonads in triploid could be categorized into three status： （1）very poor develop,for example the two-year-old male triploid＇ s spermary were very small and the spermatid just stay at spermatophore period. （2） abnormal develop, some female triploid＇s unilateral ovary didn＇t developed ; some male triploid＇s spermary were most undeveloped but have several nubbly Organize on them, and one sample＇ s gonad have the normal appearance, hut it＇s gonad was gynandromorphy. （3） normal develop, it means this type triploid＇s gonad have a normal appearance and their oocyte and sperrnatid were all can find the typical pattern in them.[著者文摘]
Key words:
blunt snout bream ; auto-positive-triploid ; auto-negative-triploid ; allo-triploid ; gonad development
基金资助:
上海市农委科技兴农重点攻关项目（03-143）
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