找回密碼
 To register

QQ登錄

只需一步,快速開始

掃一掃,訪問(wèn)微社區(qū)

打印 上一主題 下一主題

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

[復(fù)制鏈接]
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
 關(guān)于派博傳思  派博傳思旗下網(wǎng)站  友情鏈接
派博傳思介紹 公司地理位置 論文服務(wù)流程 影響因子官網(wǎng) 吾愛論文網(wǎng) 大講堂 北京大學(xué) Oxford Uni. Harvard Uni.
發(fā)展歷史沿革 期刊點(diǎn)評(píng) 投稿經(jīng)驗(yàn)總結(jié) SCIENCEGARD IMPACTFACTOR 派博系數(shù) 清華大學(xué) Yale Uni. Stanford Uni.
QQ|Archiver|手機(jī)版|小黑屋| 派博傳思國(guó)際 ( 京公網(wǎng)安備110108008328) GMT+8, 2025-10-8 00:44
Copyright © 2001-2015 派博傳思   京公網(wǎng)安備110108008328 版權(quán)所有 All rights reserved
快速回復(fù) 返回頂部 返回列表
永吉县| 抚宁县| 长汀县| 长丰县| 兰溪市| 稻城县| 运城市| 大埔区| 蒙自县| 西充县| 卫辉市| 孝昌县| 濮阳市| 桃源县| 柘城县| 兴国县| 吉林省| 石嘴山市| 米脂县| 喜德县| 井冈山市| 天祝| 保山市| 祁门县| 乌鲁木齐县| 上林县| 盐城市| 彭阳县| 东山县| 托里县| 农安县| 平度市| 甘孜| 蛟河市| 大连市| 新巴尔虎右旗| 西华县| 乳山市| 大埔县| 乐至县| 阳山县|