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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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21#
發(fā)表于 2025-3-25 04:07:57 | 只看該作者
22#
發(fā)表于 2025-3-25 09:15:17 | 只看該作者
Agriculture, fournisseurs, filières fascine or limestone boulders, is unfavourable for fish only in the initial phase and more in small than in large rivers. Revetments provide many hiding places for fish and make net operation for poachers more difficult, but they are quickly damaged by water flow.
23#
發(fā)表于 2025-3-25 11:45:21 | 只看該作者
Médecines d‘Asie: Savoirs et Pratiquesarlings. In River Skjern ? the material will be offspring of the local stock. In the other rivers where the natural stocks have become extinct, the stocking material will be offspring from Irish, Scottish and Swedish salmon stocks, sometimes combined with material from River Skjern ?.
24#
發(fā)表于 2025-3-25 16:45:50 | 只看該作者
Endangered freshwater fish of Spainn, while 25 species are included in the EU Council Directive on the Conservation of Natural Habitats in 1992. Nevertheless, Spanish conservation laws are still insufficient since only seven species are protected by the National Catalogue of Threatened Species in 1990.
25#
發(fā)表于 2025-3-25 21:51:29 | 只看該作者
26#
發(fā)表于 2025-3-26 01:04:48 | 只看該作者
27#
發(fā)表于 2025-3-26 05:04:06 | 只看該作者
Natural regenerations of endangered fish populations in the Pilica drainage basin after reducing hum fascine or limestone boulders, is unfavourable for fish only in the initial phase and more in small than in large rivers. Revetments provide many hiding places for fish and make net operation for poachers more difficult, but they are quickly damaged by water flow.
28#
發(fā)表于 2025-3-26 10:30:13 | 只看該作者
29#
發(fā)表于 2025-3-26 13:46:03 | 只看該作者
30#
發(fā)表于 2025-3-26 20:40:54 | 只看該作者
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