Assessment of a brown troutSalmo truttapopulation in the River Gallo (central Spain): Angling effects and management implications (Salmonidae)
作者:
Ana Almodóvar,
GracielaG. Nicola,
期刊:
Italian Journal of Zoology
(Taylor Available online 1998)
卷期:
Volume 65,
issue sup1
页码: 539-543
ISSN:1125-0003
年代: 1998
DOI:10.1080/11250009809386881
出版商: Taylor & Francis Group
关键词: Angling;Benthos;Salmo trutta;Population dynamics;Creel survey;Habitat;Management;Spain
数据来源: Taylor
摘要:
The brown trout population of the River Gallo (central Spain) was monitored every two months during 1996 to determine the current impact of angling. To evaluate the influence of additional parameters, physical habitat and food availability were also studied. To assess fishing pressure, trout harvest and angling exploitation, a partial creel census was conducted during the 1996 fishing season. Differences were found in densities and biomass between exploited (1182.4 fish ha‐1, 68.3 kg ha‐1) and unexploited areas, the latter being markedly higher (3135.1 fish ha‐1, 208.2 kg ha‐1). Production was quite superior in the unexploited area and decreased (from 144.5 kg ha‐1yr‐1to 37.2 kg ha‐1yr‐1) as fishing pressure increased. However, no consistent differences were observed in growth, condition factor, age diversity, mortality, recruitment age and turnover ratio. Sport fishing seems to be the main negative factor influencing the balance within population of brown trout in the River Gallo and therefore management should be focused on more restrictive angling measures.
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