Tetraploid induced by physical and chemical methods in Jinjiang oyster(Crassostrea rivularis)   总被引：1，自引：0，他引：1  

Rong Shoubai  Shi Shumei  Mo Qirong  Liu Shaeqiong  Liang Ze  Zhao Xiuzhu  Tong Wangdong  Li Shouwu  Li Yimin 《海洋学报(英文版)》1994,13(2):275-283

ＴｅｔｒａｐｌｏｉｄｉｎｄｕｃｅｄｂｙｐｈｙｓｉｃａｌａｎｄｃｈｅｍｉｃａｌｍｅｔｈｏｄｓｉｎＪｉｎｊｉａｎｇｏｙｓｔｅｒ（Ｃｒａｓｓｏｓｔｒｅａｒｉｖｕｌａｒｉｓ）￥ＲｏｎｇＳｈｏｕｂａｉ，ＳｈｉＳｈｕｍｅｉ，ＭｃＱｉｒｏｎｇ，ＬｉｕＳｈａｅｑｉｏ...  相似文献   

The Ectoparasitic Gastropod Boonea (= Odostomia) impressa: Population Ecology and the Influence of Parasitism on Oyster Growth Rates     

Marie E.  White  Eric N.  Powell Christopher L.  Kitting 《Marine Ecology》1984,5(3):283-299

Abstract. Boonea (= Odostomia) impressa is a common ectoparasite of oysters. In the laboratory, small oysters (Crassostrea virginica) parasitized by natural densities of B. impressa produced 75 % less new shell than unparasitized oysters. Shell deposition rates of previously parasitized oysters increased significantly after all B. impressa were removed. Thus, the decrease in growth rate, although significant, apparently was not permanent. B. impressa preferentially parasitized small, living oysters (≤2.5cm) in the field, even though a higher percentage of large, living oysters (>2.5cm) was available. The snails maintained an aggregated distribution on the oyster reef. The number of B. impressa per oyster clump was positively correlated with the number of living oysters per clump, however some clumps with few or no living oysters had many B. impressa. Thus, food availability only partially explained the pattern of distribution. B. impressa was very mobile. About 50 % of the population moved in one week. Reproduction occurred throughout the year with a peak period in May. Recruitment was greatest in July, however new recruits were observed throughout the year. The reduction in growth rate of parasitized oysters, the snaiľs propensity towards parasitizing small oysters and the snail's tendency to be contagiously distributed suggests that B. impressa potentially exerts a significant influence on the population structure and health of oyster populations.  相似文献   

雄性三倍体长牡蛎繁殖潜力的初步研究   总被引：1，自引：0，他引：1  

丁君  张国范  常亚青  李霞  巩宁 《海洋科学》2001,25(9):55-57

国内外很多人做过三倍体长牡砺的诱导工作，但在三倍体性腺发育及配子活力方面的研究，目前仅见Ａｌｌｅｎ等１９８６年和１９９０年对三倍体的海螂和长蛎异常配子的发生报道。Ｃｏｘ１９９６年研究了悉尼岩牡蛎三倍体性腺发育情况，姜卫国等对三倍体合浦珠母贝的生殖腺进行了观察，李霞［１］对三倍体长牡蛎的性腺发育做了较系统的分析和总结。作者用流式细胞仪对长牡蛎Ｃｒａｓｓｏｓｔｒｅａ　ｇｉｇａｓ二、三倍体的性腺细胞进行了初步分析，回答了三倍体长牡蛎生殖潜力及性比方面的一些问题，为进一步研究三倍体长牡蛎的生长、繁殖、杂…  相似文献   

Ten-year record of Thalassiosira nordenskioeldii population dynamics: comparison of aquaculture and non-aquaculture sites in the Quoddy Region     

Smith  Aaron C.; Martin  Jennifer L.; Ehrman  James M.; Kaczmarska  Irena 《ICES Journal of Marine Science》2001,58(2):391-397

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Sustainable shellfish aquaculture in Saldanha Bay,South Africa     

A Santa Marta  JG Ferreira  GC Pitcher  J Lencart e Silva 《African Journal of Marine Science》2020,42(2):151-166

The carrying capacity for bivalve shellfish culture in Saldanha Bay, South Africa, was analysed through the application of the well-tested EcoWin ecological model, in order to simulate key ecosystem variables. The model was set up using: (i) oceanographic and water-quality data collected from Saldanha Bay, and (ii) culture-practice information provided by local shellfish farmers. EcoWin successfully reproduced key ecological processes, simulating an annual mean phytoplankton biomass of 7.5 µg Chl a l^–1 and an annual harvested shellfish biomass of about 3 000 tonnes (t) y^–1, in good agreement with reported yield. The maximum annual carrying capacity of Small Bay was estimated as 20 000 t live weight (LW) of oysters Crassostrea gigas, or alternatively 5 100 t LW of mussels Mytilus galloprovincialis, and for Big Bay as 100 000 t LW of oysters. Two production scenarios were investigated for Small Bay: a production of 4 000 t LW y^–1 of mussels, and the most profitable scenario for oysters of 19 700 t LW y^–1. The main conclusions of this work are: (i) in 2015–2016, both Small Bay and Big Bay were below their maximum production capacity; (ii) the current production of shellfish potentially removes 85% of the human nitrogen inputs; (iii) a maximum-production scenario in both Big Bay and Small Bay would result in phytoplankton depletion in the farmed area; (iv) increasing the production intensity in Big Bay would probably impact the existing cultures in Small Bay; and (v) the production in Small Bay could be increased, resulting in higher income for farmers.  相似文献   

水产膨化饲料   总被引：2，自引：0，他引：2  

王渊源  张敏  刘金才 《台湾海峡》2001,20(Z1):101-106

本文综述了水产膨化饲料的优势、加工原理、膨化对营养素的影响、投喂技术和投喂海水养殖鱼类的试验结果.  相似文献   

Site fidelity and dispersal patterns of domestic triploid steelhead trout (Oncorhynchus Mykiss Walbaum) released to the wild     

Bridger  C. J.; Booth  R. K.; McKinley  R. S.; Scruton  D. A. 《ICES Journal of Marine Science》2001,58(2):510-516

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我国渔用药物的研究内容及发展战略     

李健  纪青 《海洋湖沼通报》1997,(4):62-68

近几年我国渔用药物的应用越来越广泛，渔用药物的研制和生产规模取得较大发展。本文对渔用药物的定义，主要研究内容进行了描述，对目前应用范围较广的药物进行了简单分类，并对渔用药物的现状进行了分析，提出了在研制，生产，销售和使用等方面存在的一些主要问题，最后对我国渔用药物发展战略提出了几点建议。  相似文献   

Environmental impact of chemical wastes produced by the salmon aquaculture industry   总被引：1，自引：0，他引：1  

Haya  K.; Burridge  L. E.; Chang  B. D. 《ICES Journal of Marine Science》2001,58(2):492-496

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Spatial variability in growth and reproduction of the Pacific oyster Crassostrea gigas (Thunberg, 1793) along the west European coast     

Joana F.M.F. Cardoso  Denis Langlet  Jos F. Loff  Ana R. Martins  Johannes IJ. Witte  Paulo T. Santos  Henk W. van der Veer 《Journal of Sea Research》2007,57(4):303-315

The Pacific oyster Crassostrea gigas was introduced in Europe for commercial purposes in the mid 1960s. It was initially thought that low winter temperatures would restrain this species' reproduction and settlement; however, its present distribution in areas where no introduction has taken place suggests that natural invasion and expansion has occurred. Along the European coast, wild populations of Pacific oysters are already found from northern Germany to southern Portugal. Whether C. gigas will continue to further expand through northern waters will depend on its physiological performance. In this study, the performance of wild oyster populations has been studied in terms of growth and reproduction at three stations: La Rochelle (France; 46°N), Yerseke (Oosterschelde estuary, The Netherlands, 51°N), and Texel (Wadden Sea estuary, The Netherlands, 53°N). The French population had the lowest somatic-shell mass ratio and an increase in maximum shell length, somatic and gonadal mass was observed from France to the Netherlands. In addition, mean oocyte diameter decreased significantly from south to north. The combination of increasing gonadal mass and decreasing oocyte volume suggests an increasing reproductive output in terms of egg numbers from France to The Netherlands. Differences in temperature between locations will at least be partly responsible for the observed patterns; however, other environmental factors (such as food availability, predation pressure, sediment type and/or seston concentration) cannot be excluded. Since smaller eggs (oocytes) are thought to have a longer development time, the environmental conditions along the Dutch coast may result in increased larval dispersal and possibly in further population expansion.  相似文献