观赏鱼的营养与饲料配制

我国是世界上最早饲养观赏鱼的国家。据传,西周时期(公元前800年)就开始从野生鲫鱼中选择变异种群———金鱼饲养观赏。欧洲大约于18世纪才掀起饲养观赏鱼的热潮。如今,在水族箱内饲养观赏鱼已遍及全球,消费人口达数千万,饲养品种约1600多种,而且大量变种和新种不断推出,已成为     

观赏鱼全价营养饲料的研制

观赏鱼指金鱼、热带鱼和锦锂等一些可供人们欣赏的鱼类。它不仅可美化环境 ,丰富人们的业余生活 ,而且从中也可陶冶人的精神情操。随着我国国际贸易的发展 ,这些鱼早就作为一种观赏动物出口 ,远销日本、东南亚和欧美等国家 ,换取外汇 ,为祖国四个现代化建设筹集资金 ,也增进了同世界各国人民之间的友谊。同时 ,在科学研究中观赏鱼也是进行遗传、发育、生态、癌症和毒性试验等材料。长期以来 ,国际上测定各种药物对鱼类的毒性指标都以金鱼为试验动物。因此 ,发展观赏鱼养殖业在经济、科研方面都有重要的意义。然而 ,在城市和农村伴随市政和农…     

观赏鱼饲用着色剂研究进展

观赏鱼是指金鱼、锦锂和热带鱼等一些具有观赏价值的、有鲜艳色彩或奇特形状的可供人们欣赏的鱼类。与食用鱼不同,观赏鱼着重于健康、体态与色彩。鱼类的体色主要是由类胡萝卜素决定（黑色素、嘌呤、光彩细胞等也参与形成）,但鱼类自身不能合成类胡萝卜素,只能从食物中吸收、沉淀和转化成自身色素。虽然通过激光照射和药物浸泡也可以使观赏鱼体色鲜艳,但其持续时间比较短,     

观赏鱼的营养研究进展

在我国,对观赏鱼的养殖可追溯到一千多年前,而在欧洲可追溯到17世纪。在现存4000～5000种鱼类中,目前作为观赏鱼的仅仅只有几百种。对     

通州观赏鱼游进欧洲

北京通州区2.4万尾草金鱼、宫廷金鱼包装成箱,空运德国法兰克福。今年全区直接出口观赏鱼收入预计比去年增加100万美元。 通州区观赏鱼养殖面积已达到7000多亩,年     

中国观赏鱼的发展前景

随着经济的发展，人民生活水平的不断提高，观赏鱼的欣赏和饲养在世界范围内逐渐形成了一种时尚，它以五彩斑斓的色彩，摇曳多姿的体态，优雅多变的泳姿而倍受男女老少的青睐，特别是生活节奏日益紧张的今天，家庭或公司摆个水族箱养些观赏鱼可以减轻年轻人的工作压力放松精神，可以使老年人老有所为老有所乐，可以使小孩子增添童趣并在玩乐中学会不少生态知识，因此，观赏鱼已成为世     

观赏用金鱼的配合饲料

我国是金鱼的故乡。饲养金鱼在我国有着悠久的历史,饲育品种不断增多。近年来,随着人们生活水平的提高,饲养金鱼者十分广泛,而且养殖的金鱼还远销到日本、东南亚、新加坡、美国、澳大利亚等国家。     

我国观赏鱼的资源现状与市场开发

对我国观赏鱼的资源现状及目前市场开发中存在的问题进行了调查分析 ,并就此提出改革建议     

浮萍在观赏鱼饲料中应用的研究进展

浮萍是一种分布广泛的小型漂浮水生植物,具有生长能力旺盛,富含赖氨酸与类胡萝卜素等优点。观赏鱼的营养需求全面,且需要着重于鱼体的健康与体色的增艳增色。本文归纳分析观赏鱼对于蛋白质营养需求、体色色素沉积影响因素,浮萍的蛋白质含量、氨基酸组成以及色素含量,对浮萍作为新型观赏鱼人工配合饲料原料进行展望,为浮萍的进一步开发利用提供参考。     

名贵观赏鱼锦鲤的养殖技术

锦鲤是鲤鱼突变品系经人工选育而成的一种名贵观赏鱼类,其游姿高雅,体型优美,色彩艳丽,斑纹灿烂,具有较高的观赏价值,深受人们的喜爱,市场看好,养殖趋热,是目前在发展观赏鱼养殖业中销往欧洲市场一个可创汇的主要品种.其养殖技术要点如下:     

Investigational Use of Metomidate Hydrochloride as a Shipping Additive for Two Ornamental Fishes

Abstract

During shipping, ornamental fish can be stressed due to handling, high stocking densities, and deteriorating water quality. Adding sedatives, such as metomidate hydrochloride, to shipping water may improve fish survival rates and the percentage of fish in saleable condition. Although the effects of metomidate hydrochloride on the stress response in fish have been studied, its application as a shipping additive has not been well investigated, particularly for tropical ornamental fishes shipped under industry conditions. Convict cichlids Cichlasoma nigrofasciatum and black mollies Poecilia sphenops were evaluated for 7 d after a 24-h period of exposure (including ground and air transport) to one of four metomidate hydrochloride concentrations: 0.0, 0.2, 0.5, and 1.0 mg/L. Immediate posttransport and cumulative mortality data, as well as 12-h and 7-d posttransport appearance and behavior scores, were generated. In convict cichlids, the highest dose of metomidate hydrochloride (1.0 mg/L) reduced mortality (0% compared with cumulative means of 5.5–9.2% in other groups) and increased the percentage of saleable fish (91.7% were immediately saleable compared with 12.5–50% in other groups). No effect was detected in black mollies at any concentration tested. Metomidate hydrochloride showed promise as a shipping additive for convict cichlids, but further studies are warranted to evaluate species-specific responses in other ornamental species.     

鱼类食欲调控研究进展

寻找鱼粉替代物已成为肉食性鱼类养殖可持续发展的必然要求,如何提高鱼类对鱼粉替代物的利用率成为了鱼粉替代研究的瓶颈。食欲是影响鱼粉替代的重要因素,而食欲调控网络通过各种食欲调节因子(包括促进食欲因子和抑制食欲因子)的信号传递作用和中枢信号通路,对摄食进行综合调节。本文综述了常见食欲调节因子和中枢信号通路对食欲的调控,以期为鱼类食欲调控研究提供参考。     

Recreational Angler Perspectives of Nonnative Fishes

Although fish invasions have implications for conservation and resource management, research on public attitudes toward nonnative fishes is lacking. We surveyed boat and canal bank recreational anglers in the Everglades to assess their awareness, preferences, and perspectives of native versus nonnative fishes. Our findings showed that 79% of anglers were aware of the presence of nonnative fishes, and overall awareness was positively affected by the frequency of fishing, and years of angler experience at study sites. Frequency of fishing had a stronger effect on canal bank anglers. Boat anglers had higher awareness of nonnatives, higher familiarity with “nonnative” terminology, and expressed greater preferences for native fish. Most anglers favored native species (72% preference), and targeted native fishes, particularly Florida Largemouth Bass (66%). Overall, findings show that despite the prevalence of nonnative species, anglers favored native fishes and supported native fish conservation.     

Genetics of Melanomas in Xiphophorus Fishes

Abstract

Data are presented from studies on heritable melanoma formation in certain hybrids of Xiphophorus fishes. In the best investigated case, benign and malignant melanomas were caused primarily by hemizygous and homozygous loss, respectively, of a tumor suppressor gene that promoted final pigment cell differentiation, although additional genetic events may be of importance. In other melanoma cases, different genes, most of them presumably also tumor suppressor genes, have been implicated in the development of melanomas and may interact at other levels of pigment cell development, such as commitment, migration, or homing of pigment cell precursors. Importantly, genetic factors have been identified that do not allow melanoma formation despite the loss of tumor suppressor genes. Taken together, these findings stress the complexity of tumorigenesis and the heterogeneity of pathways that lead to cancers of the same histological type.     

营养物质对鱼类食欲的影响

寻找理想鱼粉替代物是近20年动物营养学的研究热点之一,尽管在肉食性鱼类中鱼粉替代物因适口性差、消化率低、氨基酸不平衡和存在抗营养因子等原因导致其替代比例较低,然而,随着鱼粉供求关系的进一步不平衡,替代鱼粉已成为肉食性鱼类养殖可持续发展的必然要求。因此,如何提高肉食性鱼类对鱼粉替代物的利用率成为了鱼粉替代研究的瓶颈。本文从食欲的角度,综述各种营养物质对食欲的影响,以便利用营养措施来人为调控鱼类的食欲,从而提高饲料利用率。