科技创新助推星云湖珍稀濒危鱼种保护

近年来,云南省玉溪市江川区以科技创新为引领,积极开展星云湖珍稀濒危鱼种的人工繁殖和养殖技术试验研究。经过不断试验总结和探索,国家二级保护野生动物大头鲤、星云白鱼等星云湖土著鱼种的人工繁殖相继获得成功,并荣获了多项国家、省、市专利,创新成果的推广有效保护了星云湖珍稀濒危物种。

张星桥水库治理翘嘴红鲌侍庋芯?

张星桥水库三年来鱼产量下降，主要原因是由于翘嘴红繁衍过快。本文根据翘嘴红的生物学特性，分析提出了扦捕和药物清库两种措施。为达到根治目的，着重分析了采用生石灰进行清库的方法；清库时间在１１月上中旬为宜；实施清库时对鱼种的保护，要求采用良好的捕捞方式，准备足够的暂养池。并预测清库的后果是；将形成以中上层经济鱼类为主的生态平衡；水质变肥，鱼的生长加快；三年后鱼产量开始回升。

Protection and Development of Varicorhinus macrolepis Germplasm Resources

Varicorhinus macrolepis is a unique rare fish in the Mount Tai area and belongs to the national second-class protected animals. Due to the development of Mount Tai area and the impact of human activities, the amount of wild V. macrolepis resources has been reduced sharply and is about to go extinct. In order to protect this rare freshwater fish, various protection policies have been promulgat- ed by various levels of government and various protection measures have been im- plemented, a number of studies have been conducted by all levels of scientific re- search institutes, and local enterprises, farmers and social groups are also actively involved in the protection activities. The protective measures and the achieved re- sults were summed up in this paper. It is believed that with the active participation of government at all levels, scientific research institutes at all levels, breeding units and social groups, significant results have been obtained after years of implementa- tion of the protection-development pattern, the amount of V. macrolepis germplasm resources has been recovered significantly, and V. macrolepis has been utilized suc- cessfully in the nutrition, health care, tourism, culture and other areas. The protec- tion model for V. macrolepis has a certain reference value for germplasm resources protection, propagation and development of other rare species.

The loss of genetic diversity during captive breeding of the endangered sculpin, Trachidermus fasciatus, based on ISSR markers: implications for its conservation

Abstract Inter-simple sequence repeat （ISSR） markers were used to determine the genetic variation and genetic differentiation of cultured and wild populations of Trachidermus fasciatus, an endangered catadromous fish species in China. Six selected primers were used to amplify DNA samples from 85 individuals, and 353 loci were detected. Relatively low genetic diversity was detected in the cultured population （the percentage of polymorphic loci PPL=73.80%, Nei＇s gene diversity h--0.178 2, Shannon information index I=0.276 9）. However, the genetic diversity at the species level was relatively high （PPL-91.78%; h = 0.258 3, I= 0.398 6）. The UPGMA tree grouped together the genotypes almost according to their cultured and wild origin, showing distinct differences in genetic structure between wild and cultured populations. The pairwise F^t values confirmed significant genetic differentiation between wild and cultured samples. The cultivated population seems to be low in genetic diversity as a result of detrimental genetic effects in the captive population. The results suggest that ISSR markers are effective for rapid assessment of the degree of diversity of a population, thus giving important topical information relevant to preserving endangered species.

Seasonal variation in species composition and abundance of demersal fish and invertebrates in a Seagrass Natural Reserve on the eastern coast of the Shandong Peninsula,China

Seagrass habitats are structurally complex ecosystems, which support high productivity and biodiversity. In temperate systems the density of seagrass may change seasonally, and this may influence the associated fish and invertebrate community. Little is known about the role of seagrass beds as possible nursery areas for fish and invertebrates in China. To study the functioning of a seagrass habitat in northern China, demersal fish and invertebrates were collected monthly using traps, from February 2009 to January 2010. The density, leaf length and biomass of the dominant seagrass Zostera marina and water temperature were also measured. The study was conducted in a Seagrass Natural Reserve(SNR) on the eastern coast of the Shandong Peninsula, China. A total of 22 fish species and five invertebrate species were recorded over the year. The dominant fish species were Synechogobius ommaturus, Sebastes schlegelii, Pholis fangi, Pagrus major and Hexagrammos otakii and these species accounted for 87% of the total number of fish. The dominant invertebrate species were Charybdis japonica and Octopus variabilis and these accounted for 98% of the total abundance of invertebrates. There was high temporal variation in species composition and abundance. The peak number of fish species occurred in August–October 2009, while the number of individual fish and biomass was highest during November 2009. Invertebrate numbers and biomass was highest in March, April, July and September 2009. Temporal changes in species abundance of fishes and invertebrates corresponded with changes in the shoot density and leaf length of the seagrass, Zostera marina.

细鳞鱼

现在，细鳞鱼已濒临灭绝，所以一旦有幸钓中它们，请一定放生，为了今后的钓鱼人还有机会见到它们的容颜。

How territoriality affects the density of an egg predator： Habitat renovation and reintroduction as a method of conserving two endangered desert spring fish

Conservation of endangered sympatric species must be carefully executed to ensure that the protection of one species does not negatively impact the survival of another. Critically endangered Pecos gambusia Gambusia nobilis and Leon Springs pupfish Cyprinodon bovinus, which are endemic to a threatened desert spring habitat, exemplify one such scenario. Recently, this habitat has been expanded, and captively bred C. bovinus were released to repopulate an area historically known to contain this species. A previous study suggested that G. nobilis are detrimental to C. bovinus populations, due to their tendency to congregate near spawning pairs and feed on their eggs. Whether G. nobilis are attracted to territorial C. bovinus, regardless of spawning behavior, remains unclear. To determine this, the number of G. nobilis in occupied and unoccupied breeding territories of both wild and captively bred C. bovinus was measured. Gambusia nobilis densities were similar between unoccupied and occupied territorial sites, suggesting that they do not show a preference for C. bovinus territories. Regardless of habitat location or prior captivity, territorial C. bovinus significantly excluded G. nobilis within their direct vicinity （5 cm）, but not from their entire territory. Decreased G. nobilis density within the habitat may allow C. bovinus to defend their breeding territories more readily during the summer spawning season. This study provides empirical evidence of captively raised individuals behaving similarly to wild indi- viduals upon reintroduction to their natural habitat and support for conservation methods that focus on common limiting factors between endangered species [Current Zoology 60 （4）： 527-533, 2014].