View in EDS

Evaluating recreational fisheries for an endangered species: a case study of taimen, Hucho taimen, in Mongolia.

Saved in:
Bibliographic Details
Title: Evaluating recreational fisheries for an endangered species: a case study of taimen, Hucho taimen, in Mongolia.
Authors: Jensen, Olaf P., Gilroy, David J., Hogan, Zeb, Allen, Brant C., Hrabik, Thomas R., Weidel, Brian C., Chandra, Sudeep, Vander Zanden, M. Jake
Source: Canadian Journal of Fisheries & Aquatic Sciences; Oct2009, Vol. 66 Issue 10, p1707-1718, 11p, 4 Charts, 4 Graphs, 1 Map
Subject Terms: BIOLOGICAL research, MARINE biology, ANIMAL ecology, TAIMEN, FISHERIES, AGRICULTURE, ENDANGERED species, WILDLIFE conservation, MONTE Carlo method
Geographic Terms: MONGOLIA
Abstract (English): Understanding the tradeoff between exploitation and conservation is difficult in data-poor situations, which are typical for most recreational fisheries, even in developed countries. In a developing country where the target species is endangered, the stakes are higher and the management resources are fewer. We combined a mark–recapture experiment, life history invariants, and meta-analysis to parameterize a delay-difference model for a population of the endangered giant Eurasian trout (taimen, Hucho taimen) in northern Mongolia. The model allowed us to evaluate the impacts of a recreational fishery for taimen based on a suite of population characteristics including equilibrium abundance, biomass, and mean weight. The Bayesian framework and Monte Carlo simulations combine disparate sources of information while keeping track of uncertainty as it propagates through the model. In the case of taimen in the Eg–Uur watershed, the existing catch–release recreational fishery has likely reduced taimen abundance, biomass, and mean weight by less than 10% compared with levels predicted in the absence of recreational fishing. In comparison, if all taimen caught in this fishery were retained (as they are elsewhere in Mongolia), there is a 57% chance that such harvest levels, if maintained, would lead to the eventual extirpation of the population. [ABSTRACT FROM AUTHOR]
Abstract (French): Il est difficile de comprendre le compromis entre l’exploitation et la conservation dans les pêches sportives lorsqu’il y a peu de données, ce qui est très souvent le cas, même dans les pays développés. Dans un pays en voie de développement lorsque l’espèce cible est menacée, les enjeux sont plus importants et les ressources de gestion moindres. Nous combinons une expérience de marquage–recapture, des invariants du cycle biologique et une méta-analyse afin de paramétrer un modèle de différence avec délais pour une population du huchon géant d’Eurasie (le taimen, Hucho taimen), une espèce menacée, dans le nord de la Mongolie. Le modèle nous permet d’évaluer l’impact d’une pêche sportive du taimen à partir d’une série de caractéristiques démographiques, dont l’abondance à l’équilibre, la biomasse et la masse moyenne. Le cadre bayésien et la méthode de Monte Carlo combinent des sources disparates de renseignements, tout en tenant compte de l’incertitude à mesure qu’elle se propage dans le modèle. Dans le cas du taimen de l’Eg–Uur, la pêche sportive actuelle avec remise à l’eau des prises a vraisemblablement réduit l’abondance, la biomasse et la masse moyenne du taimen par moins de 10 %, par comparaison aux valeurs prédites en l’absence de pêche sportive. D’un autre côté, si tous les taimens capturés dans cette pêche étaient gardés (comme ils le sont ailleurs en Mongolie), il y a une probabilité de 57 % qu’une telle intensité de capture, si elle devait se maintenir, aboutirait à une extirpation éventuelle de la population. [ABSTRACT FROM AUTHOR]
Copyright of Canadian Journal of Fisheries & Aquatic Sciences is the property of Canadian Science Publishing and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Complementary Index
Description
Abstract:Understanding the tradeoff between exploitation and conservation is difficult in data-poor situations, which are typical for most recreational fisheries, even in developed countries. In a developing country where the target species is endangered, the stakes are higher and the management resources are fewer. We combined a mark–recapture experiment, life history invariants, and meta-analysis to parameterize a delay-difference model for a population of the endangered giant Eurasian trout (taimen, Hucho taimen) in northern Mongolia. The model allowed us to evaluate the impacts of a recreational fishery for taimen based on a suite of population characteristics including equilibrium abundance, biomass, and mean weight. The Bayesian framework and Monte Carlo simulations combine disparate sources of information while keeping track of uncertainty as it propagates through the model. In the case of taimen in the Eg–Uur watershed, the existing catch–release recreational fishery has likely reduced taimen abundance, biomass, and mean weight by less than 10% compared with levels predicted in the absence of recreational fishing. In comparison, if all taimen caught in this fishery were retained (as they are elsewhere in Mongolia), there is a 57% chance that such harvest levels, if maintained, would lead to the eventual extirpation of the population. [ABSTRACT FROM AUTHOR]
ISSN:0706652X
DOI:10.1139/F09-109