共查询到18条相似文献，搜索用时 171 毫秒
1.
本文总结我国虹鳟引进至今在消化吸收及国产化方面所取得的进展及当前存在的主要问题。并提出今后我国养鳟业应以专业户为主，加强对现有鳟鱼场的管理，挖掘潜力，建立全国流通体系。南方养鳟可土池、水泥池并举以降低成本在技术管理上需予注意三个问题。 相似文献
2.
本文阐述了养鳟业的经济意义和价值,并从养鳟用水和生产方式、苗种生产、食用鱼养成、养鳟饲料、海水养鳟,疾病防治等方面总结了养鳟基本技术,同时对我国养鳟历史作了回顾,提出了我国养鳟业的发展前景。 相似文献
3.
4.
5.
本文通过养鳟发展的历史进程,指出了饲料在虹鳟养殖发展中的作用。并根据当前中国养鳟状况阐述了中国养鳟饲料的现状以及存在的问题,并展望了饲料工业的发展前景。 相似文献
6.
本溪位于辽东山区，养鳟条件优越，近年养鳟业发展迅速，形成了一定规模，带动了辽东地区养鳟事业。全市有国营养鳟场1处，集体养鳟场7处，个体户养鳟200户，养鳟面积120亩。年产鳟鱼30多万公斤。为丰富菜篮子，开辟农村致富门路起到了重要作用。 相似文献
7.
8.
9.
10.
自１９５９年中国从朝鲜引进虹鳟以后，又先后从前苏联、日本、法国引进了养鳟技术，养鳟业开始在中国萌芽。此后经历了将近２０年的沉默，上世纪８０年代后期养鳟业开始向全国普及，１９９６年后又先后引进了金鳟、山女鳟、白点鲑、褐鳟、大西洋鲑等品种，中国养鳟业由虹鳟单一品种养殖进入了多品种养殖的发展新时期。现在全国至少有２６个省、市、区发展了养鳟业，养鳟场户达８００余家，年产鳟鱼约６０００～８０００吨，已开发利用的冷水资源流量达４０～６０米３／秒。随着养鳟业的发展，鳟鱼游钓、鳟鱼饲料加工、鳟鱼食品加工等相关产… 相似文献
11.
12.
海水池塘养殖模式优化：概念、原理与方法 总被引：5，自引：2，他引：5
随着海洋渔业资源衰退和人类社会对水产品需求的持续增长,海水养殖规模逐年扩大,养殖生产对环境的影响也日益严重[1-6]。现已确认海水鱼虾类养殖是造成海洋沿岸带水域富营养化的重要污染源之一[5-8],这一严峻现实要求今后在发展海水养殖产业时不仅需要宏观上对养殖区域和养 相似文献
13.
14.
Abstract. In temperate regions of North America, the culture of rainbow trout, Oncorhynchus mykiss (Walbaum), in ponds is constrained to the period mid-November to early April by water temperature. Feeding practice may influence production time. The effects of three feeding practices on growth and body composition of rainbow trout raised in ponds during a 142-day winter growth period were investigated. Feeding practices were (1) hand-feeding to satiation, (2) feeding according to a fish size/water temperature chart, and (3) feeding by demand feeder.
Fish fed to satiation consumed 66% more diet than fish fed according to a feeding chart and 163% more than fish fed by demand feeders. Fish fed to satiation had significantly higher (P < 0·05) weight gain, harvest weight, specific growth rate, and protein gain with no significant increase (P > 0·05) in percentage body fat or feed conversion ratio (FCR) compared to the other two treatments. Survival percentage did not differ significantly (P > 0·05) between treatments. These data indicate that by using satiation feeding, marketable size rainbow trout can be produced in temperate region ponds without increases in percentage body fat or FCR. 相似文献
Fish fed to satiation consumed 66% more diet than fish fed according to a feeding chart and 163% more than fish fed by demand feeders. Fish fed to satiation had significantly higher (P < 0·05) weight gain, harvest weight, specific growth rate, and protein gain with no significant increase (P > 0·05) in percentage body fat or feed conversion ratio (FCR) compared to the other two treatments. Survival percentage did not differ significantly (P > 0·05) between treatments. These data indicate that by using satiation feeding, marketable size rainbow trout can be produced in temperate region ponds without increases in percentage body fat or FCR. 相似文献
15.
本文回顾了虹鳟饲料的发展和我国当前存在的问题,阐述了虹鳟营养的基础,并提出了在配方设计和加工中应注意的某些技术问题。 相似文献
16.
对虾养殖池塘微藻群落结构的调查与分析 总被引：4，自引：0，他引：4
分别于2005年秋、2006年春对广东省湛江市东海岛的对虾集约化养殖池(高位池)、半集约化养殖池(土塘)及其引水渠中水体的微藻群落结构进行调查和分析。结果表明,在所调查的对虾池塘中共检出微藻47种,其中春季检出微藻28种,秋季检出微藻21种。主要优势种是颤藻(Oscillatoria sp.)和啮蚀隐藻(Cryptomonas erosa Ehr.)。微藻的多样性指数(H′)平均值为春季东南土塘2.29,东南高位池1.42,东山土塘1.12;秋季东南高位池2.14,东山土塘1.62,而2季节引水渠则处于0.92~3.72之间。对虾池塘微藻平均密度秋季高于春季。 相似文献
17.
There is concern that expanding beaver (Castor fiber) populations will negatively impact the important economic, recreational and ecological resources of Atlantic salmon (Salmo salar) and sea trout (Salmo trutta) populations in Europe. We studied how beaver dams influenced habitat, food resources, growth and movement of juvenile Atlantic salmon and trout on three paired beaver-dammed and beaver-free (control) tributaries of important salmon rivers in central Norway. Lotic reaches of beaver-dammed and control sites were similar in habitat and benthic prey abundance, and ponds were small (<3,000 m2). Though few juvenile salmonids were detected in ponds, trout and salmon were present in habitats below and above ponds (comprising 9%–31% and 0%–57% of the fish collected respectively). Trout dominated control sites (79%–99%), but the greatest proportion of Atlantic salmon were upstream of beaver ponds (0%–57%). Growth rates were highly variable, with no differences in growth between lotic reaches of beaver-dammed and control sites. The condition and densities of juvenile salmon and trout were similar in lotic reaches of beaver-dammed and control sites, though one beaver-dammed site with fine sediment had very few juvenile salmonids. Beaver dams did not block the movement of juvenile salmonids or their ability to use upstream habitats. However, the degree of repeated movements and the overall proportion of fish moving varied between beaver-dammed and control sites. The small scale of habitat alteration and the fact that fish were able to move past dams makes it unlikely that beaver dams negatively impact the juvenile stage of salmon or trout populations. 相似文献
