Gametogenic cycle of the transplanted-cultured pearl oyster, Pinctada fucata martensii (Bivalvia: Pteriidae) in Korea     

Youn Hee Choi  Young Jin Chang   《Aquaculture (Amsterdam, Netherlands)》2003,220(1-4):781-790

The gonadal development and gametogenic cycle of transplanted-cultured pearl oyster, Pinctada fucata martensii, were investigated using individuals collected monthly from Tong-Young along the south coast of Korea from October 2000 to September 2001. The result of monthly change of condition index was similar to tissue weight rate. The highest value was observed in June and the lowest value was observed in November. The gonad of the pearl oyster was located around the digestive diverticula. The ripe testis was milky white while the ovary was light brown. The spawning period of the pearl oyster extended from April to August, with a peak between June and July. The gametogenic cycle could be classified into five successive stages: multiplicative stage (November to February), growing stage (January to March), mature stage (March and April), spawning stage (April to August) and resting stage (September to November).  相似文献   

The influence of water temperature on spawning patterns and egg quality in the Atlantic halibut (Hippoglossus hippoglossus L.)     

N.P. Brown  R.J. Shields 《Aquaculture (Amsterdam, Netherlands)》2006,261(3):993-1002

A three-year study was conducted to investigate the effects of water temperature on Atlantic halibut broodstock reproductive performance. Two groups of fish held under ambient photoperiod were established onto contrasting temperature regimes. The ‘chilled’ group were held at below 9 °C from late October and at approximately 6 °C from December until the end of the spawning period whilst the ‘ambient’ group received no temperature control. The temperature profiles for the ‘ambient’ group changed over the 3 years but were generally characterised by warmer conditions prior to spawning and an earlier temperature rise in the spring. Total egg production was higher in the ‘chilled’ group each year. Absolute fecundity was significantly reduced in the ‘ambient’ group compared to the ‘chilled’ group every year of the study (0.6 million eggs/female for ‘chilled’ group vs. 0.3 to 0.4 million eggs/female for ‘ambient’ group) and egg viability, in terms of fertilisation and hatch rate, was significantly impaired in the ‘ambient’ group in years 2 and 3 (mean fertilisation rate in the ‘ambient’ group was between 27.0% and 54.8%; vs. 63.4% to 77.4% in the ‘chilled’ group, mean hatch rate in the ‘ambient’ group was between 3.1% and 25.6% vs. 60.7% to 71.7% in the ‘chilled’ group). Eggs spawned at high temperatures, later in the season were generally of low viability. In the ‘ambient’ group the spawning season became progressively delayed during the study and average duration of spawning season over 3 years was shorter (between 23.5 to 26.3 days for the ‘ambient’ group vs. between 30.5 and 41.2 days for ‘chilled’ group). It is hypothesised that high temperature during the vitellogenesis period caused a delay in spawning and a reduction in quantity and quality of eggs and that this effect was exacerbated by high temperature during spawning.  相似文献   

黑龙江茴鱼的人工繁殖技术研究初报   总被引：2，自引：0，他引：2  

徐革锋  梁双  孙冬梅  韩英  牟振波 《水产学杂志》2006,19(2):51-53

黑龙江茴鱼平均产卵量为2 256粒/尾,属分批产卵型。在平均水温7．7℃(4．2～10．8℃)情况下：100～110℃·d时眼点明显；120～140℃·d开始破膜；200～210℃·d破膜结束；250℃·d左右开始上浮；270℃·d左右开口。发眼率为54．86～71．07％；孵化率为72．15～77．63％；上浮率为51．53～66．56％。  相似文献   

Effect of different schedules for broodstock exchange on the seed production of Nile tilapia Oreochromis niloticus (L.) in freshwater     

M.T. Ridha  E.M. Cruz 《Aquaculture International》2003,11(3):267-276

This study compares the effect of three broodstock exchange treatments (exchange every month, two months and three months) versus no-exchange control treatment on year-round seed production and spawning synchrony of Nile tilapia Oreochromis niloticus stocked in 0.4 m³ fiberglass tanks within a recirculating water system. Adult males and females with mean body weights of 161.7 g and 127.6 g, respectively, were stocked at a rate of 4 fish/tank with a male to female sex ratio of 1:3. Water temperature at 29 ± 1.0 °C and photoperiod of 18 h/day were maintained throughout the experiment. The results showed that broodstock in the exchange treatments had higher seed production and spawning synchrony compared with those in the no-exchange treatment. The exchange treatments resulted in 70.5 to 97% increase in seeds kg female^–1 day^–1. The different spawning parameters of broodstock in the two- and three-month exchange treatments were higher than the one-month exchange treatment. Results suggest that broodstock exchange strategy has a long-term improvement effect on seed production and spawning synchrony, and exchanging all breeders every three months is more profitable in terms of better utilization of breeders and in reducing both the holding/conditioning facilities for broodstock and the labor cost.  相似文献   

斜带髭鲷室内产卵的研究   总被引：3，自引：0，他引：3  

王涵生  郑乐云  方琼珊 《福建水产》2001,(3)

本文报道了斜带髭鲷在室内大量自然产卵的试验结果。实验表明:3龄亲鱼采用加强饵料营养,结合使用适当剂量的激素(TRHR-A_2、TRHR-A_3和HCG)进行催熟和催产,亲鱼产卵量大,产卵集中,卵质较好。使用57尾亲鱼(27尾雌鱼,30尾雄鱼),总产卵量6256.5×10~4粒,受精卵4504.5×10~4粒,平均每尾雌鱼产卵231.7×10~4粒,平均受精率66.7％,仔鱼孵化率 79.2％。  相似文献   

K^＋对几种海胆幼虫变态的诱导效果     

王波  张榭令等 《齐鲁渔业》2002,19(3):26-28

K^ 是对海洋底栖无脊椎动物幼虫诱导普遍有效的无机离子。本文探讨了K^ 对红海胆等9种胆的变态诱导效果，分析了其安全使用浓度、处理时间等技术。对有关因子对变态率的影响进行了对比。  相似文献   

渤海对虾亲体与补充量（SRR）动态特性的研究↑（*）   总被引：2，自引：1，他引：2  

邓景耀  朱金声  任胜民 《中国水产科学》1996,3(2):20-26

８０年代以来，渤海对虾的补充量，特别是亲体数量大幅度下降。根据１９８３－１９９４年４月烟威外海对虾亲体资源量指数和渤海秋汛对虾渔获量，按Ｂｅｖｅｒｔｏｎ－Ｈｏｌｔ和Ｒｉｃｋｅｒ模式求得各项参数值，有Ｒ－１ｔ＝３．８６×１０－３＋１．１７×１０－２Ｓ－１ｔＲ２＝０．７４ｐ＜０．００１Ｒｔ＝９０．０５Ｓｔｅ－０．１６２１７ＳｔＲ２＝０．５１ｐ＜０．０１表明：当今渤海对虾亲体对补充量有决定影响，可是８０年代亲体数量的平均值只有６０年代和７０年代的３４．４％和４４．２％；而进入９０年代以来，亲体数量又较８０代下降了２０％。８０年代中期渤海沿岸产卵场的环境条件因对虾养殖业的迅速发展发生了较大变化，养殖面积和单位面积产量大幅度增加。这个新的环境因素对对虾补充量也有一定的影响。渤海对虾亲体数量严重短缺，是恢复和增加对虾补充量的主要限制因素  相似文献   

玉米离体孤雌生殖研究   总被引：1，自引：0，他引：1  

董清山 《延边大学农学学报》2006,28(1):61-66

针对玉米离体孤雌生殖培养中未能解决的诱导率偏低等问题，以黑龙江省18份玉米杂交种或杂交组合为试验材料，将未授粉雌穗接种在9种诱导培养基上，对影响其离体孤雌生殖诱导率的培养基及不同材料之间子房膨大率与结实率等进行了研究．结果表明，筛选出的玉米离体孤雌生殖最佳培养基为B，成份为：MS＋2，4-D 1mg／L＋NAA 1mg／L＋KT 1mg／L＋LH 200mg／L＋cokchicine 2mg／L＋MET 1mg／L＋sucrose 5％＋agar 0．8％；不同材料之间子房膨大率及结实率均有显著差异，变幅分别为2．4％～16．7％和0％～2．67％．61％的材料能诱导结实．当培养50-60d后，从牡20—618、牡342、牡21—178、牡21—257的未授粉子房直接培养再生出4颗小植株．  相似文献   

甜菜当年抽薹开花诱导技术在育种上的应用   总被引：1，自引：0，他引：1  

陈丽  赵春雷 《中国糖料》2004,(1):1-4

对不同类型甜菜品系及不同苗龄幼苗光温诱导敏感性进行了研究。结果表明:不同类型甜菜品系、不同苗龄的幼苗均表现出随着光温诱导时间的延长,其抽薹率、开花率和结实率均有提高;但不同类型品系之间对光温诱导的敏感性存在着较明显的差异,同一品系幼苗的不同苗龄间也存在着一定的差异。饲料甜菜品系HSLTC在诱导80d以前各期的抽薹率明显高于糖甜菜品系DP10,但其开花率和结实率在各诱导时期均明显低于DP10。随着诱导时间的延长,各品系的抽薹率、开花率和结实率有所递增,糖甜菜幼苗的光温诱导时间以110d左右为宜,饲料甜菜应不少于130d。  相似文献   

组织培养结合秋水仙素诱导滇杨多倍体的研究     

陈杰  周军  孙正海  唐军荣  段安安  王俊峰  辛培尧   《云南农业大学学报(自然科学版)》2013,28(2):251-257

 利用组织培养结合秋水仙素对滇杨进行多倍体诱导,以期获得滇杨多倍体植株。结果表明：组织培养结合秋水仙素诱导滇杨产生多倍体的较优组合为秋水仙素浓度为80mg/L下处理30d或在90mg/L下处理20～30d,此时,多倍化诱导率最高可达186%。对滇杨多倍体植株与正常植株进行外部形态、染色体数目及单位叶面积内气孔数目的观察,发现多倍体植株与正常株形态差异明显,染色体数目增加为76条,叶表皮气孔变大,同时,叶片中叶绿素含量约为二倍体的1.5倍。  相似文献