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Classroom games of renewable fishery resource : Experimental results at Obihiro University of Agriculture and Veterinary Medicine OAK
齋藤, 陽子; 渡邉, 大樹; 河田, 幸視.
学生が被験者として実際に行動する教室実験は,経済学への関心を高めることが期待され実験経済学の分野でもその教育的効果が認識されてきた。小稿では,本学2年生を対象に行った共有資源管理に関する教室実験の結果に基づき,授業で実験を行うことの有効性を議論する。実験は資源管理が不可欠とされる漁業資源を対象に,共同管理の難しさ,現実へ当てはめた場合の問題点を理解することを目的とした。具体的な実験方法としては,いくつかの管理方法(シナリオ)を設定し,学生に魚(あめ玉)の収穫を行ってもらった。ひとつのシナリオを終了する毎に解説・議論することで,参加意欲が高まり,実験の意味や資源管理の難しさを身近に理解することができた。今後は,実験後に被験者への詳細な聞き取りを行うなど,共同管理に失敗する心理的要因を探ることが課題となる。
Palavras-chave: 再生可能資源; 教室実験; 共同管理; 漁業資源; Renewable resource; Classroom games; Experiments; Co-management; Fishery resource.
Ano: 2009 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2652
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Bioecology of the crab Ucides cordatus (Crustacea, Decapoda) in mangroves influenced by the Amazon River, Brazil Acta Amazonica
Amaral,Kárlia Dalla Santa; Vieira,Inácia Maria; Osório,Frederico Moreira; Rocha,Joana D'arc Mauricio; Lima,Jô de Farias.
The mangrove crab (Ucides cordatus) is a valuable fishery resource, overfished along the Brazilian coast. This study aimed to obtain bioecological data on this crab along the coast of the State of Amapá. Six bimonthly samplings were conducted between December 2008 and January 2010. Transects were used to estimate the density (burrows m-2) and population abundance (individuals m-2). All the animals were subjected to biometrics, with females being classified according to their stage of gonadal maturation. The mean density (1.09 burrows m-2) and abundance (0.31 individuals m-2) were influenced by the climate with the highest values in summer (1.17 burrows m-2 and 0.34 individuals m-2). The male to female ratio was 1.38:1 showing significant difference in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: State of Amapá; Reproductive dynamics; Population structure; Fishery resource.
Ano: 2014 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672014000200007
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Size at morphological maturity of Ucides cordatus (Linnaeus, 1763) (Brachyura, Ocypodidae) in the Laranjeiras Bay, Southern Brazil BABT
Dalabona,Glaucia; Silva,Jayme de Loyola e; Pinheiro,Marcelo Antonio Amaro.
Morphometry and maturity of Ucides cordatus were analyzed with males and females collected during one year on a monthly basis at Laranjeiras Bay, Paraná State, Brazil. Carapace length, chelipeds propodus length and abdominal width were measured and related to carapace width to verify sexual dimorphism and size at morphological maturity of each sex. Carapace and propodus length of larger and smaller cheliped presented difference between sexes, confirming the use of both as secondary sexual characters. MATURE II program indicated 44mm and 43mm of carapace width to represent the size at sexual maturity of males and females, respectively.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Reproduction; Relative growth; Fishery resource.
Ano: 2005 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132005000100018
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Evaluation of the Blue Crab Callinectes sapidus Rathbun, 1896 Bycatch in Artisanal Fisheries in Southern Brazil BABT
Ruas,Vinicius Mendes; Becker,Cintia; D’Incao,Fernando.
ABSTRACT We evaluated the incidental catch of the blue crab in artisanal fisheries through the analysis of sex ratio, catch per unit effort, net positioning, and size in which the capture probability was 50% (P50). The specimens were collected from 2011 to 2013 in the estuary of Patos Lagoon, southern Brazil. The analysis showed a higher occurrence of males. Variations in the catch per unit effort showed greatest abundance values close to the mouth of the estuary. Catch per unit effort was similar when comparing fishing seasons and net positions. P50 indicated a low selectivity of the nets since it varied between studied areas but stayed below the size at first maturity. Catches indicated a greater effort on males, since females migrated to spawn in the...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Brachyura; Fishery resource; Patos Lagoon; Fyke net; Estuary.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132017000100448
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