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101.
K. Holmgren 《Ecology of Freshwater Fish》1996,5(4):203-212
In a controlled experiment, elvers (Anguilla anguilla L.) were reared for 137 weeks at 17, 20 and 26°C. Most eels with macroscopically sexable gonads were males. The proportions of females were 14% of sexable individuals at 26°C and 7–8% at 17 and 20°C. During the first 15 weeks, 20–50% of initial numbers were lost, but this early mortality was not significantly size selective. In spite of a long term experiment, a significant number of the survivors never attained a sexable size. Nongrowers (7–9 cm) were still alive nearly three years after being caught as glass eels. Among the earliest fast growers, 5% females, or less, were found. The proportion of females increased in later grading groups, but the pattern of increase did not indicate that males and females have separated mean ranks in a fixed growth hierarchy. Water temperature influenced observed sex ratios, but probably not through direct influence on the sex differentiation. Some alternative hypotheses, dealing with population density and individual growth status, are discussed. 相似文献
102.
山药(Dioscorea opposite Thunb.)为药食兼用的常见蔬菜,而其染色体的研究相对滞后。以根尖为试验材料,分别考察不同的取材方式、预处理试剂、预处理方法以及解离方式对山药染色体制片效果的影响,筛选优化制片的关键技术,以期为今后细胞学研究打下基础。结果表明:室内基质培养块茎(或零余子)的方式获取的根尖中中期分裂相个数最多,且染色体分散良好的中期分裂相占的比例最高;适合于山药核型分析的预处理试剂为8-羟基喹啉同秋水仙素的混合液、8-羟基喹啉溶液,其中8-羟基喹啉溶液预处理后染色体缢痕更清晰,为最好的预处理试剂;预处理方法以低温4℃下2 mmol/L的8-羟基喹啉预处理2 h最好;采用酸解加酶解的方式解离效果明显好于单用酸解的方式,并且得到的制片中染色体形态清晰,96.3%的中期细胞的染色体分布于同一个水平面上。 相似文献
103.
A group of Atlantic salmon (Salmo salar) was followed through their first year of maturation and spawning. At monthly intervals, starting with juvenile fish in December, 5–7 fish of each sex were killed, and liver and plasma were sampled. The last sampling point was of spawning fish in November a year later. Variables in the cytochrome P450 (P450) system were studied in hepatic microsomes, and estradiol 17 was measured in the plasma of females to assess the maturational status. The P450 1A1-mediated 7-ethoxyresorufin O-deethylase (EROD) started at high levels in winter, but decreased to non-detectable activities in pre-spawning females. Decreases, but not to the same extent, were also observed during this period in total cytochrome P450, cytochrome b5, NADPH-cytochrome P450 reductase, and in the content of two immunochemically determined P450 isozymes. At the same time, LSI levels increased in maturing females (starting in July), and GSI levels increased in both sexes (starting in May). Sex specific differences were observed in pre-spawning fish in September and October, with levels of total P450, b5, NADPH-cytochrome P450 reductase, EROD and P450 isozymes significantly lower in females. At the same time, plasma estradiol-17 levels reached peak values in females. The results point to the important role of sex steroids such as estradiol-17 as major factors in the regulation of final sexual maturation. However, this study also indicates that there may be estradiol-17 independent events of equal importance in the early stages of gonadal maturation that may involve the P450 system. The changes observed in the P450 system (as a major drug and steroid metabolizing system) of Atlantic salmon during sexual maturation may be of importance both in the endogenous transduction of hormonal signals, and as a pharmacological basis for designing therapeutic treatment of diseases in the aquaculture industry.Parts of this work were presented at the 5th International Symposium on Responses of Marine Organisms to Pollutants, April 1989 in Plymouth, United Kingdom (Larsen and Goks\/oyr 1989). 相似文献
104.
在解剖、测量性成熟和未成熟中华绒螯蟹外部形态和性腺之基础上,试用“双百分率法”和“差异显著性检测法”对中华绒螯蟹的副性征进行了研究。结果表明,性成熟后的雌、雄中华绒螯蟹均具有较明显的副性征。 相似文献
105.
106.
N. W. Pankhurst G. van der Kraak R. E. Peter B. Breton 《Fish physiology and biochemistry》1986,1(3):163-170
Male goldeye were treated with (D-Ala6, Pro9-N ethylamide) — LHRH (LHRH-A) in saline or a silastic pellet (100 µg.kg–1 body weight) and changes in plasma gonadotropin (GtH), 17,20-dihydroxy-4-pregnen-3-one (17,20P) and testosterone (T) levels were determined by radioimmunoassay. LHRH-A increased plasma GtH levels, with the response to LHRH-A in saline being of much greater magnitude and duration than the response to silastic pellet implants. Seasonal differences were found in the response to LHRH-A. Spermiated fish were the most responsive, recrudescing fish the least, and regressed fish displayed an intermediate response. Plasma 17,20P levels were elevated in response to LHRHA in fish of all sexual stages although the magnitude of the increase was not related to the magnitude of the increase in GtH levels. Treatment with LHRH-A also resulted in a transitory increase in plasma T levels. The endocrine control of GtH and steroid secretion in goldeye is discussed in relation to studies in cyprinids and salmonids.
Address for reprint requests: Department of Zoology, University of Alberta, Edmonton, Alberta T6G 2E9 Canada. 相似文献
107.
108.
109.
为了探究内源乙烯与蓖麻性别的关系,以蓖麻雌性自交系 YC2-S 及其姊妹两性自交系 YC2-F 为材料,
用气相色谱法测定了不同时期叶片内源乙烯释放率的变化。 结果表明院从三叶期到开花期,雌性系内源乙烯释放率呈
倒野S冶型变化,即从三叶期的 137. 9 滋L/ kg 窑 h下降到五叶期的 17. 5 滋L/ kg 窑 h,然后缓慢上升,现蕾期达到 40. 9 滋L/ kg 窑 h,开
花期再降至 26. 9 滋L/ kg 窑 h;两性系呈野U冶型变化,即从三叶期的 149. 8 滋L/ kg 窑 h下降到五叶期的 18. 4 滋L/ kg 窑 h,然后持
续上升,到开花期达到 226. 3 滋L/ kg 窑 h。 二者在六叶期以前没有差异,六叶期后,前者先升后降,后者持续上升,现蕾期
差异显著、开花期差异极显著。 证明乙烯是蓖麻性型决定的关键因素之一。 相似文献
110.
性外激素诱发中华乌塘鳢产卵的初步研究 总被引:7,自引:0,他引:7
在陶瓷人工产卵管道内吊挂性外激素的研究表明,卵巢提取液对雄鱼的吸引作用大于雌鱼,而精巢和贮精囊提取液对雌鱼的吸引作用则大于雄鱼,17α-P、17α,20β-P和PGE2对雌鱼和雄鱼均具有相似的吸引作用。雌鱼在管道内的产卵次数、产卵量以及成熟卵的受精率均与产卵管道内吊挂的性外激素种类有关,17α,20β-P和PGE2两个实验组产卵次数最多,其中PGE2实验组的产卵量和受精率最高。17α-P在贮精囊和精巢提取液中的含量显著高于卵巢提取液(P<0.05);贮精囊提取液中PGE2和PGF2α的含量分别显著高于精巢提取液和卵巢提取液(P<0.05);提取液中PGE2和PGF2α的含量均依次为贮精囊提取液>精巢提取液>卵巢提取液。卵巢提取液刺激雄鱼所引起的平均EOG高于雌鱼,而精巢和贮精囊提取液刺激雌鱼所引起的平均EOG高于雄鱼,雌鱼和雄鱼对17α-P、17α,20β-P、PGE2和PGF2α刺激所产生的平均EOG,以PGE2为最高。 相似文献