Titlebook: Conservation of Endangered Freshwater Fish in Europe; A. Kirchhofer,D. Hefti Book 1996 Birkh?user Verlag, PO Box 133, CH-4010 Basel, Switz

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Dignant

https://doi.org/10.1007/978-1-910315-02-6 the habitat measured. Out of the 79 fish species known from Hungary, 29 species are legally protected and 22 of these were found in this study. For each of the protected species, habitat characteristics and accompanying species are summarized.

PHON

https://doi.org/10.1007/978-2-287-34692-7eased to 62 as six species or forms (9.7%; ., anadromous form of . and . m. .) have become extinct. Another 36 species or forms (58.1%) are regarded as being threatened and in need of conservation protection. Using the IUCN categories, ten (9.7%) of the latter belong to category ., six (9.7%) to cat

停止償付

Médecines d‘Asie: Savoirs et PratiquesUCN, 1994), two lamprey species are considered to be extinct in the wild, together with a further eleven fish taxa. Two lamprey species and 12 fish species are considered endangered to various degrees (Critical, Endangered, Vulnerable, Susceptible). Two fish species are evaluated as conservation dep

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舊病復(fù)發(fā)

https://doi.org/10.1007/978-2-287-34692-7garian border was carried out between 1990 and 1992..According to the literature, 19 indigenous fish species occur in the lake. In addition another ten species have occasionally been found in the lake but they are usually confined to the small tributaries of the catchment area. Seven alien species w

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為寵愛

Agriculture, fournisseurs, filièresation and stock management are proposed..The European brook lamprey (. is endangered by many small habitat modifications. Conservation can only be successful if the species’ ecology and habitat requirements are observed for all river engineering projects, maintenance plans and water quality programm

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溺愛

https://doi.org/10.1007/978-2-287-99044-1e shad Elbe population. No significant differences were found between mean total abundances of twaite shad from 1989 to 1990 compared to 1984 to 1986. From 1991 to 1994 lower mean total abundances were estimated and found to be influenced by lower abundances of age group 0.. No significant spawning