|
|
|
| Registros recuperados: 11 | |
|
| |
|
| |
|
| |
|
|
| Ba, Kamarel; Thiaw, Modou; Fall, Massal; Thiam, Ndiaga; Meissa, Beyah; Jouffre, Didier; Thiaw, Omar Thiom; Gascuel, Didier. |
| For the first time in Senegal, assessments based on both stochastic and deterministic production models were used to draw a global diagnosis of the fishing impact on coastal demersal stocks. Based one national fisheries databases and scientific trawl surveys data: (i) trends in landings since 1971 were examined, (ii) abundance indices of 10 stocks were estimated using linear models fitted to surveys data and commercial catch per unit efforts, and (iii) stock assessments were carried out using pseudo-equilibrium Fox and Pella-Tomlinson models and a Biomass dynamic production model fitted in a Bayesian framework to abundance indices. Most stocks have seen their abundance sharply declining over time. All stocks combined, results of stock assessments suggest a... |
| Tipo: Text |
Palavras-chave: Coastal demersal species; Delta-GLM models; Surplus production models; Bayesian approach; Overexploitation; West Africa. |
| Ano: 2018 |
URL: https://archimer.ifremer.fr/doc/00626/73792/74929.pdf |
| |
|
|
| Forest, Andre. |
| Following the decision of the European Union to enforce drastic management actions in the fishery sector, there is now a debate on the reality of the overexploitation of the major living resources. This paper firstly provides an overview of the state of the world fishery resources as it is shown by international studies. It then focus on European fisheries which are of interest for the French fleets, including those which are not managed by a TAC and quotas system. Finally, various arguments which are often used to explain the depletion of fishery resources in European waters are examined. We conclude that fishing dominates all other factors with regard to the evolution of marine living resources. |
| Tipo: Text |
Palavras-chave: Overexploitation; European fisheries; Fishery resources; Surexploitation; Pêcheries européennes; Ressources halieutiques. |
| Ano: 2004 |
URL: http://archimer.ifremer.fr/doc/2004/acte-6413.pdf |
| |
|
| |
|
| |
|
|
| Abila, R.O.; Othina, A.. |
| Wetlands in most parts of the world are under threat of over-exploitation partly because their socio-economic value is not well known. Yala Wetland, the largest freshwater wetland in Kenya, with a large part of it bordering Lake Victoria’s shoreline, faces even greater threats of extinction. This wetland measures about 17,500 ha and is host to a number of indigenous fish species, animals and plants which are exploited by the local communities for subsistence and commercial purposes.There has been pressure to reclaim portions of this wetland for agricultural activity. So far, 2,300 ha has, indeed, been drained for commercial agriculture. Furthermore, it is difficult to control effort in the exploitation of the remaining wetland resources since the... |
| Tipo: Proceedings Paper |
Palavras-chave: Wetlands; Inland waters; Overexploitation; Socioeconomic aspects; Fishery resources; Resource management; Water reservoirs; Monitoring systems; Land use; Resource conservation; Environment management; Protected resources; Freshwater lakes; Inland fisheries; Lake fisheries; Wetlands; Inland waters; Overexploitation; Http://aims.fao.org/aos/agrovoc/c_8371; Http://aims.fao.org/aos/agrovoc/c_3876; Http://aims.fao.org/aos/agrovoc/c_28014. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/1493 |
| |
|
|
| Diarra, Bassirou. |
| La pêche au Sénégal joue un rôle économique et social très important par une contribution globale de près de 11% du PIB primaire et 2,3% du PIB total. Elle occupe de façon directe et indirecte environ 600 000 personnes, soit près de 17% de la population active selon la DP M. Cependant ces dernières décennies, les études ont montré que le secteur traverse une crise aiguë se traduisant par une raréfaction croissante des ressources, notamment les espèces nobles qui ont une forte valeur commerciale. Cette crise est due entre autres à une surexploitation de ces ressources qui est le résultat d’un manque de maîtrise de l’effort de pêche surtout pour les pêcheries artisanales (80% des débarquements et plus de 60% des approvisionnements des industries de la place)... |
| Tipo: Theses and Dissertations |
Palavras-chave: Ocean surveillance; Ecosystem management; Fishing effort; Overexploitation; Biodiversity; Artisanal fishing; Fisheries. |
| Ano: 2006 |
URL: http://hdl.handle.net/1834/5003 |
| |
|
| |
|
|
| SEPÚLVEDA,MARITZA; OLIVA,DORIS; URRA,ALEJANDRA; PÉREZ-ÁLVAREZ,MARÍA J; MORAGA,RODRIGO; SCHRADER,DANIEL; INOSTROZA,PATRICIA; MELO,ANGELA; DÍAZ,HUMBERTO; SIELFELD,WALTER. |
| The onshore distribution and abundance of the South American sea lion Otaria flavescens along the central Chilean coast was estimated during the period January-February 2007. Additionally, changes in population abundance during the period 1970-2007 were examined. Population surveys were based on photographs taken from boats or aircraft. A total of 16301 sea lions (CI = 16209-16375) were counted in 33 colonies (6 breeding and 27 non-breeding sites). After correction to account for the proportion of individuals at sea and for pups not seen at the time of the survey, the mean estimated abundance was 18179 (95 % CI = 17777-18851) sea lions. Population trend analysis showed that from 1970 to 1985, South American sea lions showed a positive increase of... |
| Tipo: Journal article |
Palavras-chave: Census; Chilean coast; Otaria flavescens; Overexploitation; Sea lions. |
| Ano: 2011 |
URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2011000100007 |
| |
| Registros recuperados: 11 | |
|
|
|
