共查询到17条相似文献，搜索用时 125 毫秒
1.
台湾东风螺的生殖腺组织学和生殖周期 总被引：14，自引：2，他引：14
本文运用组织切片技术对台湾东风螺的雌、雄生殖腺进行了周年研究。生殖腺在组织学上可分为4个时期,即增殖期、生长期、成熟与产卵期和退化期。卵子发生也历经卵原细胞增殖期、生长期、成熟期和退化期4个阶段。早期卵母细胞具有十分明显的卵黄核(yolk nucleus),早期精巢具有大量的支持细胞。台湾东风螺的繁殖期在福建诏安沿岸是6～9月,水温和食物保障是影响性腺发育的重要因子。 相似文献
2.
为了开发保护胶州湾菲律宾蛤仔增养殖业,保护菲律宾蛤仔资源,本文利用组织学手段对胶州湾移植底播菲律宾蛤仔的性腺发育及生殖周期进行了研究。通过组织切片观察,确定胶州湾移植底播菲律宾蛤仔除5～6月份为繁殖期之外,9～10月为另一繁殖期。根据性腺细胞在生殖滤泡中的比例,将其第二繁殖期内的生殖腺发育过程分为增殖期、生长期、成熟期、排放期和休止期五个阶段。结合自然海区调查观测。确定海区水温15℃以上时,蛤仔排放精、卵,且在繁殖盛期至少有两次集中排放的过程。胶州湾移植底播菲律宾蛤仔的性腺发育和生殖周期与自然野生种群的情况基本一致。 相似文献
3.
泥蚶的性腺发育和生殖周期 总被引：6，自引：0，他引：6
根据生殖细胞发育的宏观和组织切片观察以及各期生殖细胞在滤泡中所占的比例，泥蚶的生殖腺发育过程分为增殖期、生长期、成熟期、排放期和休止期五个阶段。按肥满度的变化并结合性腺组织切片确定，泥蚶的性晚发育在青岛海区一年一个周期。繁殖期在７月上旬至８月下旬，繁殖盛期在７月中旬至８月中旬。至少有二次集中排放过程。 相似文献
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三倍体合浦珠母贝的生殖腺观察 总被引：1，自引：0，他引：1
通过对三倍体合浦珠母贝Pinctada martensii(D.)春、秋两个繁殖盛期的生殖腺发育状况和性比观察,发现大多数三倍体在外观上没有生殖腺或者只有发育不全的生殖腺。组织切片检查结果表明,多数三倍体的生殖腺停留在休止期和增殖期,少数发育到生长期。没有一个三倍体的生殖腺发育达到成熟期。三倍体中,雌性占94.3％,雄性占5.7％。 三倍体的生殖腺中,初期的生殖细胞占多数,没有出现成熟的卵母细胞和精子。有些滤泡和生殖细胞萎缩退化。因此,三倍体生殖腺发育异常,三倍体合浦珠母贝是不育的。 相似文献
6.
刘竹伞 《中国海洋大学学报(自然科学版)》1989,(Z2)
本文作者对青岛丁字湾的泥蚶生殖腺发育的周年变化,做了组织学观察,探讨了其与水温、滩温的关系。根据生殖腺发育的周年变化,将其分为六期:增殖期、生长期、成熟期、排放期、耗尽期、休止期。这对泥蚶养殖中,正确掌握人工育苗和半人工育苗的时间提供了依据。 此外,也观察到了泥蚶的雌雄同体现象。 相似文献
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三倍体合浦珠母贝的生殖腺观察 总被引：13，自引：6，他引：13
通过对三倍体合浦珠母贝pinctada martensyy（D．）春、秋两个繁殖盛期的生殖腺发育状况和性经观察，发现大多数三倍体在外观上没有生殖腺或者只有发育不全的生殖腺。组织切片检查结果表明，多数三倍体的生殖腺停留在休止期和增殖期，少数发育到生长期。没有一个三倍体的生殖腺发育达到成熟期。三部体中，雌性占94．3％，雄性占5．7％。三倍体的生殖腺中，初期的生殖细胞占多数，没有出现成熟的卵母细胞和精子。有些滤泡和生殖细胞萎缩退化。因此，三倍体生殖腺发育异常，三倍体合浦珠母贝是不育的。 相似文献
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2011年8月至2012年7月,采集广西北海廉州湾红树蚬(Polymesoda erosa)的周年样品进行了性腺发育、生殖周期和胚胎发育研究。结果表明,红树蚬雌雄异体,性别可通过成熟生殖腺颜色区分;1年1个生殖周期,性腺发育可分为增殖期、生长期、成熟期、排放期和休止期5个阶段,性腺发育两性同步;繁殖期从6月延续到11月,其中7月和10月为繁殖高峰期;肥满度指数最高为5.19%(5月份),最低为1.98%(2月份);繁殖方式为非孵育型,沉性卵,外被一层厚的胶质卵膜,水温26℃时,D形幼虫孵出时间约为27h。 相似文献
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扁玉螺的生殖腺组织学和生殖周期 总被引：1，自引：0，他引：1
采用组织切片和HE染色法,对烟台沿海扁玉螺的生殖腺发育过程进行了观察.根据性腺发育的组织学特征,将扁玉螺生殖腺发育过程分为增殖期、生长期、成熟期、排放期和休止期5个时期;扁玉螺在烟台沿海每年一个生殖周期,繁殖季节为5月上旬至8月中旬,繁殖盛期为6月上旬至7月下旬.上述研究结果探明了扁玉螺的生殖腺发育规律,丰富了扁玉螺的繁殖生物学资料,对开发利用扁玉螺有着积极的意义. 相似文献
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合浦珠母贝三倍体和二倍体的生长比较 总被引：13，自引：0，他引：13
合浦珠母贝Pinctada martensii(D.)三倍体和二倍体的生长测定表明,三倍体成贝平均壳高、壳长、壳宽和体重均超过二倍体同胞,差异极显著(P<0.01)。特别是抑制第一极体形成的三倍体,经两年养殖,壳高、体重和肉重分别比二倍体增加13.01％,44.03％和58.37％。在繁殖期,三倍体的增长率显著超过二倍体。非繁殖期的大多数月份,三倍体的增长率和二倍体相差不大。因此,可以认为三倍体生长速度快主要是由于三倍体的生殖腺发育受阻,体内积累的能量转移到体细胞生长所致。 相似文献
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根据尖紫蛤Ｈｉａｔｕｌａａｃｕｔａ发育程度，将生殖腺发育过程分为增殖期、生长期、成熟期、排放期和休止期五个时期。尖紫蛤生殖期在福建省为９—１１月，生殖盛期在１０月．温度是影响性腺发育的主要因素。绝大多数个体为雌、雄异体。雌、雄同体的同一滤泡中，雌、雄生殖细胞分区域分布。较晚期的卵母细胞和成熟卵子的核仁变成双质核仁，组织化学实验结果表明，双质核仁染色深浅的两部分，是由于这两部分蛋白质含量不同的缘故。 相似文献
12.
S. Buchanan 《新西兰海洋与淡水研究杂志》2013,47(5):859-870
The annual reproductive cycle of Perna canaliculus (Gmelin) was investigated for 1 year by collecting monthly gonad samples from an intertidal population. Gonads of 50 animals were dissected and photographically recorded on video before being fixed for histological sectioning. The histological gonad sections were examined both qualitatively, using a classification and scoring system (S) and quantitatively, using image analysis technology. The quantitative measures used were the proportion of: (1) sections comprising follicles (FC); (2) sections comprising gametes (GC); and (3) the proportion of follicles comprising gametes (G/F). Significant consecutive monthly changes in the qualitative and quantitative measures indicated major spawning events. Gametogenesis occurred during winter with a spawning in August‐September. Gonad condition remained low during the spring and early summer until a development period between January and March. A second major spawning event occurred between March and April. There was a high degree of synchrony in reproductive status observed between the sexes. When comparing the four measurement methods using the f statistic as an index of power the GC measure was found to be the most reliable. A gonad visual grading system was developed for rapid assessment of gonad reproductive status and tested. Visual grades of pre‐recorded gonad samples were compared to the histological measures. Increasing visual grade correlated strongly with increases in all of the histological measurements. The visual grading was a good predictor of the spawning activity of female P. canaliculus. 相似文献
13.
欧氏六线鱼Hexagrammos otakii Jordan & Starks性腺发育的周年变化研究 总被引：1，自引：0，他引：1
根据对青岛附近水域欧氏六线鱼（已达性成熟年龄）性腺周年宏观和组织学观察，性腺发育可分为：①重复发育Ⅱ期；②开始成熟期；③接近成熟期；④临产期或产卵期；⑤产后期。按性腺指数变化并结合性腺组织切片确定，欧氏六线鱼性腺发育在青岛海区一年一个周期，繁殖期在１０月下旬至１２月，繁殖盛期是１１月下旬至１２月中旬。 相似文献
14.
本文根据1987.12～1989.4对舟山朱家尖岛南沙沙滩逐月采集标本进行研究。结果表明,等边浅蛤Gomphina veneriformis的性腺发育可分为5期:增殖期、生长期、成熟期、排放期和休止期。在舟山海区,等边浅蛤一年中为一个繁殖周期,繁殖期为8月下旬至9月中旬。有雄性早熟现象。 相似文献
15.
Reproductive cycles of the Pacific oyster Crassostrea gigas (Thunberg) from the Marlborough Sounds, New Zealand, were followed between June 1998 and January 2000. Histological examination of the gonad confirms an annual cycle with a winter inactive period followed by rapid gonad development and a single short spawning period. The population gonad index correlated with seawater temperature and changes in tissue dry weight, condition index, and biochemical components. In winter, few individuals with early gametogenic stages were present and rapid development of primary oocytes (diam. 11 μm) occurred during spring (September‐November). The developmental rate and the diameter of mature oocytes (37 μm) was similar for the 1998 and 1999 seasons. For a standard 110‐mm‐length oyster, maximal tissue body weight and condition index were recorded in December. Rapid weight loss in January was length dependent and was attributed to spawning. Temperature was the environmental variable which best correlated with the timing of gametogenesis. Food availability (phytoplankton biomass) may have been responsible for inter‐annual variations. The biochemical composition (% glycogen, lipid, protein) of separated gonad and somatic tissues were variable seasonally and annually. Gametogenesis (oocyte diameter) was associated with increased gonad protein and glycogen and a decrease in lipid concentrations. These changes are similar to those in Pacific oyster populations from other parts of the world. 相似文献
16.
The sea cucumber Holothuria scabra is a widely distributed and economically important species that has been harvested in Kenya for decades. No previous studies have been carried out on the reproduction of this species in Kenya. Standard gonad index methods were used to analyze reproductive patterns of individuals collected monthly in 1998–1999, 2000–2001 and 2006–2007. Morphological characteristics, gonad tubule lengths and fecundity were also measured. Mean monthly gonad indices were significantly correlated between males and females indicating synchronous gonad development between the sexes. Gonad indices showed a biannual pattern that was consistent in all three years with a minor spawning event occurring between August and September and a major spawning event between November and December. The pattern of gonad growth showed significant variability between years and between months. Temporal changes in gonad growth correlated significantly with gonad tubule length and absolute fecundity. Monthly gonad indices also correlated significantly with monthly measurements of air temperature and light suggesting a possible role for both factors in timing gametogenesis and spawning. There was a shift in sex ratio from unity in the 1998–1999 and 2000–2001 samples to significantly more males in the 2006–2007 samples, as well as a significant reduction in mean sizes (body wall weight) and reproductive output (gonad index) which suggests that the reproductive success of this species is potentially negatively affected by fishing. 相似文献
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To obtain baseline information on the size distribution of individuals in the population and reproductive features of sea star Asterias amurensis, monthly surveys of the population were carried out from May to December 2010 and March to May 2015 in coastal waters off Yantai, China. Spawning period was predicted by gonad and pyloric caeca indices as well as anatomical and histological methods. In the A. amurensis population, both large individuals(143 mm) and small ones(42 mm) were present in all sampling months. The population size structure was driven by the appearance of big cohorts of individuals less than 55 mm from May to August. The appearance of small individuals in all months suggested a prolonged spawning period at other sites in this bay or sea stars growing slowly because of food shortage. An arm length is a good predictor to wet body weight for A.amurensis. The development of gonad was relative slow from May to September but rapidly reached a peak of20.95 in October 2010, and then dropped remarkably, indicating its spawning lasted from October to November.The same phenomenon was found from March to May 2015, suggesting another spawning during March to May,which was also verified by the results of histologic analysis on ovary. The gonad index(GI) and pyloric caeca index(PCI) tended to show a negative relationship. Due to the poor food availability, the reproductive characteristics of sea star were most likely affected by the shellfish mariculturein Yantai coastal waters. 相似文献