Zheng Guoxing , Shen Yalin , Li He
1990, 14(1):1-7.
Abstract:From July to October in 1987 an epizootic disease occurred in theprawn farm of Pingtan island, Fujian Province. The acute infected disease wasdescribed as "red leg disease" locally, which was characterized by heart and nearbyregion becoming light orange, pleopods red and swimming activity reducing. Thekemolyph drawn from heart of diseased shrimp was thin, turbid and unclottable.The mortality due to this disease was over 90% in shrimp stock. Five strains wereisolated from hemolymph of moribund shrimps. Infection experiments ascertainedthat the bacterial isolates were the cause of the disease. All bacterial isolates showed Gram-negative short rods with a single polarflagellum. They produced acid but no gas from glucose. Moreover, they were oxida-se-positive and could not grow in peptone water lacking NaCl or containing 8%NaCl, or at 42℃. But they grew well in peptone water containing 3 or 6% NaCl.Test for the decarboxylation of lysine and ornithine were negative and argininepositive. All strains were sensitive to vibriostatic agent 0/129. The organisms were identified as Vibrio anguillarum, which was first reported in China as the causativeagent of prawn disease.
1990, 14(1):8-14.
Abstract:According to the biological characteristics of eel (Anguilla japonica)and the phenomenon of El Nino, a study on the relation between eel fry catchesand the environment has been attempted, By using statistic method to analysethe data of recent three years, it was found that the fluctuation of the eel fry pro-duction correlated with the SST anomalies of eastern Pacific. And also, the increm-ent or reduction of eel fry catch can be affected by El Nino. The year next to ElNino year is the year of increment of eel fry catch. The period of increment or re-duction of eel fry catch is 2-4 years. As to the catch level before 1987, the propor-tion of eel fry catch among the world, mainland of China and Japan is 100: 35: 45.Under the most situation, when 8.7≥AT≥-0.7, the eel fry catch will increase.Otherwise, it will reduce. The forecast regression equation of the world's eel frycatch can be described as follows:ΔCn=31ATn-1+22tons(AT≤4.0)ΔCn=-31Tn-1-270tons(AT4.0)
Zheng Dongqiang , Huang Zongguo
1990, 14(1):15-24.
Abstract:Biofouling organisms attached on mariculture cages were studied inDaya Bay, Guangdong province in 1986 to 1987. 124 species of organisms wererecorded. The dominant species were Mycale adhaereris, Bugula neritina, Schizopo-rella unicornis, Hydroides elegans, Ostrea radix, Balanus reticulatus, Styela plicataand S. canopus. These organisms grew throughout the year, and the most flourishperiod was from March to June. The wet weights attached organisms on mariculturecages were 8.3-545.0g/m2 monthly and 150.0-6250.5g/m2 seasonally. The great-est cover areas were 73.4% monthly and 94.9% seasonally. The biofouling onpearlshell cages was more flourish in summer than in winter. The greatest record-ed wet weight was 4506.2g/m2 on pearlshell cages. In summer, the number of bio-fouling species on pearlshell reached as many as 50 species, when the wet weightreached as high as 16.5 of each pearlshell.
Chang Jimin , Qu Guangping , Zhang Qingwen , Zhuang Lihe
1990, 14(1):25-32.
Abstract:A new type of installation for prawn culture is designed and a sub-merged dike provided with net-screen is built on the pond in intertidal zone. Whenthe tide is coming in, sea water can overflow the dike into the pond. The dike cankeep enough water in the pond and the net screen will prevent the prawn fromescaping when the tide is going out. In such a way the sea water in the pond is self-exchanged. Therefore, this installation is very economical, low cost, energy-saving,easy to manage, and high in production. Two completed projects were built and theexcellency of the installation has been proved.
Sun Yao , Yu Hong , Yang Qinfang , Song Yunli
1990, 14(1):33-39.
Abstract:Pollution condition of organic matter and nutrient salts and nutri-tion type were analysed to the investigation of Dingzi Bay waters during shrimpculture season in 1987. The results showed that the waste water discharged fromlarge area shrimp ponds could result in eutrophication in the bay and thus causeserious pollution of organic matter and nutrient salts. Pollution degree and nutri-tion type evidently varied in season. IP was a restrictive factor that limited theincrease of primary production in the waters. The possibility of occurance of redtide in Dingzi bay waters was also discussed.
1990, 14(1):40-43.
Abstract:A rapid preparation of fatty acid methyl esters by using direct reactionin the ground sample without lipid extraction was developed. Fish flesh, fish viscera,fish liver. fish eggs and dried shrimps were used as samples in comparative experi-ments. The results of this new direct method were extremely close to those of or-dinary method in which lipid was extracted according to Bligh-Dyer's method andfatty acids was esterified according to Metcalfe's method (tt_(0.05). The advantagesof this direct method are rapid, reagent saving, simple and convenient. It can solvethe difficulty in extracting lipid from samples of small amount or of less in lipid inthe case of ordinary method.
1990, 14(1):44-49.
Abstract:The present paper deals with the results of a preliminary study onthe disposition of filaments on the egg-membrane of salangid fishes, among thir-teen species, 4 are described for the first time and 6 with supplements or amend-ments. Five types of disposition are recognized, 1. fine and close, as seen in Protosalanx chinensis (Basilewsky) 2. sparse and straight: Hemisalanx prgnathus (Regan) 3. sparse and waved, Neosalanx oligodontis Chen 4. sparse and angulate: Leucosoma chinesensis (Osbeck) 5. short and radiated: Neosalanx taihuensis Chen
Chai Minjuan , Huang Yuling , Jiang Xinpo
1990, 14(1):50-54.
Abstract:The effect of subthlethal concentrations of copper ions on respira-tory physiology of freshwater fish (Tilapia sp.) was studied. By comparing therespiratory frequency, respiratory amplitude and opercular movement among thegroups of fish reared in various concentration of Cu2+ for 15 days, it was foundthat the frequency of abnormal opercular movement increased with increasingconcentrations of copper ions, and the cough movement appeared ealier than theexpulision reflex did. This suggested that cough movement and expulsion reflexcould be used as the sensitive biological monitoring indexes under pollution ofsublethal concentration of copper ions.
Zhang Kejian , Tong Heyi , Chen Makang
1990, 14(1):55-59.
Abstract:鲥鱼是名贵的溯河洄游性鱼类,每年春夏之交,沿我国东南近海作生殖洄游,并溯入长江、钱塘江和珠江繁殖。
Le Weizhang , Zhong Ruoying , Yuan Zhongyi , Jia Jiawu
1990, 14(1):60-65.
Abstract:由于合成纤维弹性较大、表面光滑,打结后结不易牢固。
Ding Qingquan , Yu Lanfen , Wang Xuelan , Ke Lihua , Ye Yinyun
1990, 14(1):66-69.
Abstract:草鱼出血病是一种严重的病毒性疾病,它会引起草鱼大批死亡。
1990, 14(1):70-71.
Abstract:卤虫是生活在沿海盐区水体中的一种小型甲壳动物。
1990, 14(1):72-78.
Abstract:一、新海洋法中的渔业规则 (一)1982年海洋法公约中的渔业规则在国际法中的地位 联合国第三次海洋法会议于1978年底召开,经过长期协商,于1982年4月23日通过了《海洋法公约》,公约于1982年12月10日开始签字,有119个国家立即签了字。