找回密碼
 To register

QQ登錄

只需一步,快速開(kāi)始

掃一掃,訪問(wèn)微社區(qū)

打印 上一主題 下一主題

Titlebook: World Fish Farming: Cultivation and Economics; E. Evan Brown Book 1983 The AVI Publishing Company, Inc. 1983 Asia.China.Fish farming.Hunga

[復(fù)制鏈接]
41#
發(fā)表于 2025-3-28 18:28:44 | 只看該作者
42#
發(fā)表于 2025-3-28 20:21:25 | 只看該作者
United Kingdom,Total production was about 4400 MT in 1980 and 5200 MT in 1981 (Anon. 1981). Regrettably, however, the majority of the production is concentrated on one species, viz., rainbow trout. Nevertheless, the interest in farmed fish, actively encouraged by the media, is now extending the commercial horizons
43#
發(fā)表于 2025-3-29 02:04:09 | 只看該作者
44#
發(fā)表于 2025-3-29 03:52:02 | 只看該作者
Poland,lakes, 104,000 ha (251,000 acres) by rivers and dam reservoirs, and 60,000 ha (145,000 acres) by ponds. The most important users of these waters are State Fish Farms and the Polish Anglers Association. State Fish Farms use over 91% of total lake area and 86% of total pond area. The Polish Anglers As
45#
發(fā)表于 2025-3-29 08:26:27 | 只看該作者
Czechoslovakia,d Moravia. The greatest development was in the 16th century when complex fish farms were built in Bohemia and Moravia and water surface area was estimated to be more than 120,000 ha (296,400 acres). During the 18th and 19th centuries, cultivation became more intensive, resulting in a reduction of wa
46#
發(fā)表于 2025-3-29 14:21:48 | 只看該作者
47#
發(fā)表于 2025-3-29 16:51:21 | 只看該作者
48#
發(fā)表于 2025-3-29 23:45:25 | 只看該作者
Czechoslovakia,ter area by 50% with converted ponds being used for pastures and crops. After this time, pond area gradually declined so that by 1933 there were only about 42,000 ha (103,820 acres) in Bohemia and 5915 ha (14,610 acres) in Moravia. Following this period came the first state fish farms.
49#
發(fā)表于 2025-3-30 02:41:30 | 只看該作者
50#
發(fā)表于 2025-3-30 04:16:05 | 只看該作者
Switzerland, with 15%, and with minor quantities from France. Total supply, including domestic production and imports, was an estimated 1332 MT (1468 ST). Domestic production accounted for only 23% of total supply, with imports accounting for the bulk of total supply.
 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(ài)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, 2025-10-14 06:47
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
通州区| 钟山县| 泰州市| 手游| 尼木县| 江达县| 阿鲁科尔沁旗| 华亭县| 新化县| 左贡县| 汕尾市| 海阳市| 泰州市| 西平县| 浮梁县| 北辰区| 读书| 葫芦岛市| 东山县| 宜都市| 治多县| 廉江市| 长葛市| 灵寿县| 汉中市| 钟山县| 澳门| 和龙市| 兴城市| 尖扎县| 翁源县| 彩票| 旌德县| 中江县| 萨迦县| 长治县| 抚松县| 罗源县| 浦江县| 休宁县| 葫芦岛市|