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An ecosystem-based fisheries assessment and forecasting approach

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Title: An ecosystem-based fisheries assessment and forecasting approach
Other Titles: 生態系ベースの漁業評価予測法
Authors: Zhang, Chang Ik1 Browse this author
Authors(alt): ツァン, チャン・イク1
Keywords: Ecosystem-based approach
Assessment
Forecast
Two-tier analytical method
Ecosystem indicators
Reference points
Risk index
Issue Date: 7-Nov-2009
Citation: International Symposium on "Sustainability Science on Seafood and Ocean Ecosystem Conservation". 7 November 2009. Hakodate, Japan.
Abstract: A comprehensive ecosystem-based approach is required to holistically assess, forecast and manage fisheries resources and their associated habitats by considering ecological interactions of target species with predators, competitors, and prey species, interactions between fishes and their habitats, and the effects of fishing on these processes. A pragmatic ecosystem-based approach was developed for the assessment of fisheries resources involving three management objectives: sustainability, biodiversity, and habitat quality (Zhang et al., 2009). This approach has a two-tier analytical method. Tier 1 was designed for situations where sufficient information is available to allow for a quantitative evaluation of the status of the system, while Tier 2 was designed for situations where available information necessitated a semi-quantitative or qualitative assessment. In this approach a total of 20 Tier 1 indicators and 24 Tier 2 indicators were developed for assessment of ecosystem status, and both target and limit reference points were chosen for each indicator to assess the status of species, fisheries and ecosystems. Nested risk indices, such as objectives risk index (ORI), species risk index (SRI), fishery risk index (FRI), and ecosystem risk index (ERI), were developed to assess the ecosystem status at the management unit level. In this study an integrated fisheries risk assessment, forecasting and management for ecosystems (IFRAME) is developed by extending the approach developed by Zhang et al. (2009). IFRAME has an additional management objective, socio-economic benefits, and it also includes three sub-models, namely, assessment, forecasting, and management sub-models. The method was demonstrated by applying it to the Korean large purse seine fishery. It was found that this approach can be used to compare the status of species, fisheries and ecosystems spatially and temporally, to evaluate the performance of management options under various scenarios using an ecosystem perspective.
漁業資源の管理と予測に,生態系ベースの包括的評価法が求められている。具体的には,対象種に対する捕食,競争,餌生物との生態学的相互作用,魚類と生息場,それらに対する漁業の影響などである。実際の生態系ベース評価は,持続可能性,生物多様性および生息環境特性からなる3つの管理目標を含む漁業資源評価のために発展してきた (Zhang et al. 2009)。この評価法は2段階法からなる。第1段階では,システムの状態を量的に評価できる十分な情報がある状態をデザインしている。第2段階では,定量あるいは半定量の評価を必要とする利用可能な情報がある状態をデザインしている。種,漁業および生態系の評価を発展させるために,第1段階で20の指標が,第2段階で24の指標が開発された。入れ子状の危険指標,例えば目的危険指数(ORI),種危険指数(SRI),漁業危険指数(FRI)および生態系危険指数(ERI)が,管理単位レベルで生態系の状態を評価するために開発された。本研究における生態系のための包括的な漁業危険評価,予測および管理(IFRAME)は,Zhang et al. (2009)をさらに発展させた手法で開発されている。IFRAMEは付加的管理目標,社会経済学的利益と3つのサブモデル(評価,予測および管理)を有する。このモデルは韓国の大型巻網漁業で実証されている。この提案は,時空間的に種,漁業および生態系の状態を比較するために,生態系俯瞰による様々なシナリオのもとで管理選択枝のパフォーマンスを評価するために利用できることが分かった。
Description: Invited Lectures
Conference Name: International Symposium on "Sustainability Science on Seafood and Ocean Ecosystem Conservation"
Conference Place: Hakodate
Type: conference presentation
URI: http://hdl.handle.net/2115/39909
Appears in Collections:北海道大学サステナビリティ・ウィーク2009 (Sustainability Weeks 2009) > 国際シンポジウム「明日の海と食を守る水産海洋サステナビリティ学」(International Symposium on Sustainability Science on Seafood and Ocean Ecosystem Conservation)

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