最新刊期
期 28 ， 1987
- 摘要：The present paper deals with the Subfamily Sininae species from the China coast.The study material came from the collections of the Institute of Oceanology, Chinese Academy of Scienses in the past years.Of 10 species identified, 3(with asterisk)are recorded for the first time from China and one is not yet identified.关键词：Mollusca, Mesogastrspoda, Sininae
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发布时间：2023-04-28 - 摘要：This paper deals with a new species of Lymnaea. Specimens were collected by the authors from the tail of the Dadu River, Leshan City, Sichuan Province, on 9 Feb 1987. The snail was named Lymnaea leshanensis sp. nov. Holotypes and paratypes are deposited in the Morphological and Anatomical Laboratory of Molluscs, Leshan Teachers College.关键词：Lymnaeidae, Lymnaea, new species, reproductive system, radula
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发布时间：2023-04-28 - 摘要：The authors'1975-1995 comprehensive investigation of freshwater Gastropoda showed that Yunnan Province is home to 2 subclasses, 2 orders, 10 families, 34 genera, 124 spcies of freshwater Gastropods. According to their different roles they can be described as edible,of medical value, used as bait or feed, of harm to agriculture, economic crops, domestic animals,etc. The fauna, characteristics, distribution and abundance of Gastropoda species are also discussed.关键词：freshwater mollusc, Gastropoda, development and utilization
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发布时间：2023-04-28 - 摘要：This paper was written based on the 1979-1987 fishery resources investigations in inland water areas of Shandong Province. The 39 species of shellfishes collected in the investigation belonged to 9 families and 25 genera. The total production of freshwater shellfish resources was 238423.5 t. Suggestions for rational utilization and protection of shellfish resources are presented in the paper.关键词：freshwater shellfishes, resources
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发布时间：2023-04-28 - 摘要：Bullacta exarata (Philippi) is monoecious, reproduction is by crossfertilization. The reproduce period is from the end of March to the last ten-days of November along the coast of Zhejiang Province. The fertilized egg is protected by an egg-capsule membrane After cleavage, it is developed to gastrula, then trochophora larva, which incubates at the viliger larva stage. During artificial spats-rearing, potassium permanganate [0.28-0.9(×10-6.)]can increase hatching rates During viliger and pediveliger rearing, potassium permanganate [0.5-1(×10-6)] or formalin [5-10(×10-6)] can reduce the amount of destructive microbes and animalcules.In the pediveliger stage, it must put in adherent sea-mud. This paper presents artifical spats-rearing technology in various stages, suggests how to increase hatching rates and discusses the drugs during the rearing period.关键词：Bullacta exarata, artifical spat-rearing technology
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发布时间：2023-04-28 - 摘要：This article reports on the results of study on the induction of spawning and the artificial breeding of the clam (Cyclina sinensis )in earth ponds and plant respectively. A breakthrough in its intensive rearing was achieved. The average yield of 0.26 cm aveage body length spats in 6988 ㎡ earth ponds was 3.1119×104/m3. The average yield of the spats was 36.73×104/m3 in breeding plant ponds with total seawater volume of 105 m3. Its average body lentgh was 0.41cm.关键词：clam（Cyclina sinensis), breeding
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发布时间：2023-04-28 - 摘要：Perna viridis (green mussel )is a warm-water bivalve mollusk with attributes of rapid growth, high production, great reproductive capacity, as excellent prospects for marine aquaculture. This paper presents the results of a study on the spawning period, larval ecology, settling period, semi-artificial spat collection and determination of optimum sea areas enviromental factors (temperature, salinty PH, transparency clarity and phytoplankton). The spawning season of green mussel in the Quanzhou area is in May to September, when seawater temperature is 23-26 C. Observations showed the spawning peaks from middle of May to June; settling stage starts from early and middle June to early July. Rubber rope and palm rope were selected as settling material as they gave better results.In addition, the time to lower the setting rope and the substrata required for the settling of spats are discussed.关键词：Quanzhou Bay, Weitou Bay, Perna viridis, semi-artificial spat collection
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发布时间：2023-04-28 - 摘要：This 1964-1974 experiment on transplanting Perna viridis Linnaeus along the Guangxi coast showed that the mussels could grow and reproduce naturally there. We succeeded in semi-artifically growing seedlings which thrived well after they were put to sea. Since then, from 1967 to 1995, every year, living larvae and full-grown mussels could be found in some part of the sea along the Guangxi coast where they have evolved into a natural species.关键词：Perna viridis Linnaeus, transplanting experiment, semi-artifically gathering seedlings, artifical growing seedlings
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发布时间：2023-04-28 - 摘要：This paper outlines the characteristics of the natural environment in the coastal area of Fujian Province, the habitats, and condition of the resources of Coelomactra antiquata, and the main factor that caused the decline of this resource. It is suggested that concrete measures,such as setting up management orgenizations, relevent laws for the protection of this resource, strict implementation of a licensing system for exploiting this resource, banning its collection at certain time, etc. be taken to arrest or reverse the present declining trend of this resource.关键词：Coelomactra antiquata, habitats, condition of the resource, countermeasure
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发布时间：2023-04-28 - 摘要：Amylase activity of 10 species of Common edible mollusks were investigated under different PH values and temperatures. The results were as following: 1.The optimum temperature of amylase activity is 32℃ for Sinonovacula constricta,33℃ for Cyclina sinensis, 43℃ for Meretrix meretrix, 35℃ for Gomphina veneriformis, 34℃ for Ruditapes philippinarum,37℃ for Moerella iridescens, 43℃ for Lunatica gilva and Thais clavigera,40℃ for Bullacta exarata and 43℃ for Chlorostoma rusticum. 2. The optimum PH value for amylase activity varies from 4.6 to 6.9. 3. The amylase activities in two organs of one individual are different (liver>intestine).关键词：edible mollusks, amylase
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发布时间：2023-04-28 - 摘要：Scapharca broughtonii larvae were treated with catecholamines to test the ability of these drugs to induce metamorphosis. L-DOPA(10-4 mol/L) can promote larval metamorphosis significantly, while dopamine does not induce metamorphosis. High concentrations of L-DOPA and dopamine are toxic to the larvae. Epinephrine and norepinephrine can increase the metamorphosis rate obviously and cause no harm to the larvae Catecholamines are useful for inducing metamorphosis of Scapharca broughtonii lasvae into commercial spats.关键词：Scapharca broughtonii, metamorphosis, induce
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发布时间：2023-04-28 - 摘要：Polymerase chain reaction PCR was induced in seashells, use of 20 primers yielded 391 amplified fragments; 2 individuals of Haliotis discus hannai Ino, yidded 65 amplified fragments between 501 to 2818bp; 3 individuals of Seapharca suberenata Lischke , yielded 76 amplified fragments between 398 to 2818bp: 3 individuals of Mactra veneritormis Deshayes, yielded 154 amplified fragments between 562 to 331lbp; and 2 individuals of Mactra chinensis Philippi,yielded produced 96 amplified fragments between 478 to 331lbp. The result indicated that seashells have abundant genetic poligmorphism. RAPD can be used to facilitate study on the taxonomy and the phylogeny of seashells.关键词：seashells, DNA, PCR
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发布时间：2023-04-28 - 摘要：Measures of population divergence for Oncomelania can be derived from shell characters,anatomical characters, or molecular genetics distances. This study explores genetic divergence based on allozyme data involving 14 populations widespread throughout China, are in divergent drainage systems, and have different shell phenotypes. The authors examined 25 loci. Nei’s genetic distance ranged from 0.007 to 0.453. While there is no correlation of increasing genetic distance with geographic distance, the authors found coherent discernable patterns to the genetic differentiation. Careful examination of these patterns provided evidence for one case of cross-country transport of snails.and for the existence of three exceptional populations that appear to indicate that hybridizations between subspecies may have occurred. Excluding these four populations, patterns of genetic differentiation were in general correlated with geographic distribution and shell sculptural and shape characters. These patterns thus served as the bases for subdivision of O. hupensis into three discrete subspecies: O. h robertsoni, O.h. tangi and O.h. hupensis.关键词：Oncomelania hupensis, systematic molecular genetic differentiation
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发布时间：2023-04-28 - 摘要：Experiments on Oncomelania, the intermediate host of Schistosoma japonicum,showed that tea saponin used as the molluscicide is effective on the adult and juvenile snails and the snail eggs. Mortality of 100% was obtained by immersing the mollusca and their eggs in 2.5-5.0mg/L tea saponin solution and of 82%-90% was obtained by spraying the adult snails with tea saponin at density of 5-20 g/㎡ Compared to Niclosamide,tea saponin is much less toxic to freshwater fish. Tea saponin’s easy availability, low price, botanical origin, and nonniques in using tea saponin as molluscicide are detailed.关键词：Tea saponin, Oncomelania, toxicity
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发布时间：2023-04-28 - 摘要：Mollusca were investigated quantitatively and qualitatively at fourteen mangrove stands in Hong Kong in summer (June to september, 1994)and winter(December 1994 to February 1995). Among 52 species of mollusca identified, 45 were gastropods, 7 were bivalves. Using Bray-curtis Similarity Index and cluster analysis, all sampling sections were divided into four groups, which, starting from highest density, were Cerithidea djadjariensis, Tereloralia sulcata Clithon oualaniensis and Cerithidea rhizophorarum. The species composition of Mollusca were markedly difference in different sediment Pollution might be an important factor for the low diversity index of mollusca at the Sha Tau Kok mangrove stand. Salinity was a limiting factor to the horizontal and vertical distribution of Mollusca.关键词：Mollusca, ecology, mangrove stand, Hong Kong
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发布时间：2023-04-28 - 摘要：The species composition, distribution of biomass and habitat density, and community structure of Mollusca are analysed for appraising the nuclear power station's effect on Mollusca in the mangrove of Puyuzhou, Daya Bay. The 35 mangrove area Mollusca species collected in this study were mostly euryhalinous-eurythermic and eurytopic species. Cerithidea cingulata, C. microptera, Batillaria zonalis, Geloina coaxans and Moerella culter were dominant in numbers. The average biomass and density of Mollusca were 51.15g/㎡ and 58 ind/㎡. The vertical distribution of density in different zones was in the order：middle tide zone>low tide zone >high tide zone; while that of biomass was in the order: middle tide zone>high tide zone>low tide zone. The community structure were characterised by three distribution zones: Glaucomya chinensis-laternula anatina-Cerithidea microptera at high tide zone; C cingulata-C.microptera-Geloina coaxans at middle tide zone and Moerella culter-clausinella isabellina-Angulus sp. at low tide zone. It is shown that Mollusca community structure in the mangrove area is stability. Finally the relation of Mollusca to enviromental factors are discussed briefly.关键词：mangrove, Mollusca, ecology, Daya Bay
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发布时间：2023-04-28 - 摘要：Microgastropods in the surface sediments of the northwest side of the Okinawa Trough，are characterized by mixed ecological features indicating their inconsistency with the modern oceanic environment there. The microgastropods, except for a minority of species representing deep sea background, mainly consist of representives of inner shelf or offshore shallow water.Therefore,this fauna obviously show the ocean environments of low sea-level during the last glacial epoch of Late Pleistocene, while a minority of deep sea species in this fauna may relate to upwelling formed by the Kuroshio in the northern edges of the Okinawa. Trough.Based on the microgastropod distribution in other sea areas, it can be inferred that Kuroshio during the late glacial epoch of Late Pleistocene still exerted an important influence over the microgastropod distribution in this region, and that sea-level rise during the Holocene led to the present mixed ecological aspects of microgastropod fauna.关键词：microgastropods, ecological distribution, paleoenvironment
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发布时间：2023-04-28 - 摘要：This study on the Anodonta of Dianchi Lake, shows that the following species-Anodonta woodiana woodiana (Lea ), A. woodiana pacifica (Heude), A. woodiana elliptica ( Heude ) A. woodiana piscatora (Heude ), A. limosa (Heude ) A. fenouilli (Heude), A.vescoiana Bourgignat, A bergiana Middendouff, A sp. 1, A. sp. 2, were abundant in the lake;that their abundance in the western coast was greater than that in the easstern coast, in the northern coast was greater than that in the southern coast ;and that their distrubution depends on the water temperature, trasparency, PH, and other features of the lake.关键词：Anodonta, freshwater lake, lacustrine environment
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发布时间：2023-04-28 - 摘要：There is apparently no consensus on the definition and taxonomic composition of the Modiomorphidae. The more traditional view has been to unite Devonian Modiomorpha with Ordovician modiolopsids so that the family name Modiolopidae has been rejected as a junior subjective synonym of the Modiomorphidae(LaRocque and Newell, 1969; Bailey, 1983, Pojeta et al., 1986: Carter, 1990; Johnston, 1993; Liljedahl, 1994). However, Fang and Morris(1996) were of quite different opinion. Here some problems concerning the separation of Modiomorpha from the Modiolopsacea and of the Modiomorphidae from the Carditacea are discussed. The Modiomorphidae, under the name Permophoridae has long been placed in the superfamily Carditacea of the Heterodonta and postulated as the ancestor of carditis, while the genus Modiomorpha has been assigned to another subclass owing to inadequate information about its internal features, especially the ligament structure. This is why the investigation of the relationships between them was long hindered. The Devonian Modiomorpha and such like occupy and intermediate morphological position between the Ordovician Modiolodontidae and the post-Devonian Permophoridae, but has closer relations with the latter. The similarity of the Modiomorphidae(=Permophoridae)to the Carditidae is apparently superficial and may be due to convergence. In brief, it is difficult to discern close phylogenctic relationship between carditis and modiomorphids. The true relationship of the latter is with the Anomalodesmata (Morris, 1978; Waller, 1990; Morris et al., 1991, Johnston, 1993; Fang and Morris, 1996).关键词：MODIOMORPHIDS(BIVALVIA),TAXONOMIC POSITION
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发布时间：2023-04-28
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