摘要:

A review of the literature confirms that human activities have caused genetic changes in some wild fish populations, with most of these changes being adverse. These genetic effects include a reduction in growth rate and/or possibly in age/size at sexual maturity in some heavily fished populations. There was also considerable evidence of hybridization between wild and released populations (sometimes resulting in the loss of the wild population) and the extinction of some wild populations due to habitat changes and to competition and/or predation from introduced species.

ISSN:1064-1262    

DOI:10.1080/10641269509388568

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

This article reviews the relationship between salmonid aquaculture, both in fresh and saltwater, and water quality, focusing on the effects of bad water quality at the lethal and sublethal level, water quality assessment using physicochemical parameters, and new developments for water quality estimations: from mathematical indices and models for the interpretation and/or prediction of analytical results, to the assessment of water quality by biological methodologies. The main problems of different rearing systems, for example, land‐based farms and caged and net‐pen salmonid cultures, are also considered, taking into account not only the water quality problems originated by the culture conditions but also those related to external causes of water pollution.

ISSN:1064-1262    

DOI:10.1080/10641269509388569

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

Fisheries management faces a new era. Markets, in the form of individual transferable quotas (ITQs) and growing global integration of fish markets, will increasingly provide the organizing and regulatory principle for many fisheries. Whether ITQs and global markets are a panacea or Pandora's box for organizing and managing fisheries is, as yet, unclear, and requires additional experience to fully evaluate.

ISSN:1064-1262    

DOI:10.1080/10641269509388570

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor

摘要:

There are many reasons to investigate fish locomotion. Topics include activity rhythms, energetics, orientation in time and space, responses to a variety of stimuli, including those originating from food, conspecifics or predators, and ontogenetic changes. Habitat selection and orientation along physical gradients are of considerable interest in ecology. Besides movements of individual fish, group behavior (schooling/shoaling) is relevant in a variety of biological and fishery contexts.

ISSN:1064-1262    

DOI:10.1080/10641269509388571

出版商:Taylor & Francis Group    

年代:1995

数据来源: Taylor