Ecosystem-based ABC estimation of sea cucumber, Holothuria scabra of the Papua New Guinea coral reef fishery
- Alternative Title
- 파푸아뉴기니 산호 어장 해삼의 생태계 기반 ABC 추정
- Abstract
- The thesis describes one of the coral reef fisheries of Papua New Guinea, and focuses specifically on the most highly regarded sea cucumber, Holothuria scabra of the PNG coral reef fishery. This species of sea cucumber contributes the highest amount to the catch value in the PNG coral reef ecosystem. The ecosystem-based fisheries assessment (EBFA) approach Tier 2 developed by Zhang et al. (2011) has been used in this study to assess this fishery. A total of nineteen indicators were assessed. Seven indicators for the objective of sustainability, three indicators for the objective of biodiversity, three indicators for the objective of habitat quality and six indicators for the objective of socio-economic benefits. Each of the indicators was assessed and estimations for a magnitude that affects the fishery were carried out. Target and limit reference points were also developed in this study. The target reference points in this study corresponds to a state of each indicator that is considered desirable, while the limit reference point and beyond limit reference point is defined as the limit beyond which the state of each indicator can be considered to be at risk of exploitation. The objective risk index (ORI) was estimated for each objective. Sustainability with a value of ‘1.50’, biodiversity with a value of ‘1.06’, habitat quality with a value of ‘1.90’ and socio-economic benefits with a value of ‘0.94’. Based on these ORI’s the species risk index (SRI) was estimated with a value of ‘1.35’. Currently the acceptable biological catch (ABC) for sea cucumber, Holothuria scabra stands at 23,000 tons. An ecosystem-based ABC estimation was applied to this fishery to revise the current total allowable catch (TAC) level. In this study, by applying the ecosystem-based ABC estimation method to the current ABC of 23,000 tons at an SRI of ‘1.35’, the ABCEBFA was estimated to be 20,125 tons to achieve the target SRI of ‘1’. In conclusion, a more efficient system of data collection is required to enable a higher level of Tier 1 assessment. The results can then be compared with those from the Tier 2 approach. The management of this fishery and the sea cumber fishery as a whole should be organized into four management objectives that are suggested in this study.
- Issued Date
- 2016
- Awarded Date
- 2016. 2
- Type
- Dissertation
- Publisher
- 부경대학교 글로벌수산대학원
- Affiliation
- 부경대학교 글로벌수산대학원
- Department
- 글로벌수산대학원 국제수산과학협동과정
- Advisor
- 장창익
- Table Of Contents
- 1.0 Introduction 1
1.1. Background of the research 1
1.2. History of the research 1
1.3. Ecosystem-based fisheries management (EBFM) 4
1.4. Purpose of the study 8
2.0 Materials and Methods 13
2.1 Study area and site 13
2.2 Methods 15
2.2.1 Data sources 16
2.2.2 Target limit reference point and indicators for the Tier 2 assessment for sea cucumber, Holothuria scabra for the PNG coral reef fishery 24
2.2.3 Target and limit reference points for indicators of sustainability. 28
2.2.4 Target and limit reference points for indicators for biodiversity. 31
2.2.5 Target and limit reference points for indicators for habitat quality. 33
2.2.6 Target and limit reference points for indicators for socio-economic benefits. 35
2.3 Assessment for sea cucumber, Holothuria scabra of the PNG coral reef fishery by the Tier 2 approach. 37
3.0 Results 39
3.1 Assessment of risk scores to each indicator for sustainability of sea cucumber, Holothuria scabra of the PNG coral reef fishery 39
3.2 Assesment of risk scores to each indicator for biodiversity of sea cucumber, Holothuria scabra of the PNG coral reef fishery 42
3.3 Assesment of risk scores to each indicator for habitat quality of sea cucumber, Holothuria scabra of the PNG coral reef fishery 44
3.4 Assesment of risk scores to each inidcator for the socio-economic benefits of sea cucumber, Holothuria scabra of the PNG coral reef fishery 46
3.5 Risk zones for the number of indicators for sea cucumber, Holothuria scabra of the PNG coral reef fishery assessed by the Tier 2 approach 49
3.6 Objective risk index (ORI) assessed by the Tier 2 approach for sea cucumber, Holothuria scabra of the PNG coral reef fishery 51
3.7 Species risk index (SRI) assessed by the Tier 2 approach for sea cucumber, Holothuria scabra of the PNG coral reef fishery 53
3.8 Ecosystem-based ABC estimation of sea cucumber, Holothuria scabra of the PNG coral reef 54
4.0 Discussion 56
References 61
Acknowledgements 64
Appendix I: Target and limit reference points for indicators of sustainability in the Tier 2 EBFA. 65
Appendix II: Target and limit reference points for indicators of biodiversity in the Tier 2 EBFA. 69
Appendix III: Target and limit reference points for indicators of habitat quality in the Tier 2 EBFA. 70
Appendix IV: Target and limit reference points for indicators of socio-economic benefits in the Tier 2 EBFA. 74
Appendix V: Scanned copy of a questionnaire survey form as an example 78
- Degree
- Master
- Appears in Collections:
- 글로벌수산대학원 > 국제수산과학협동과정
- Files in This Item:
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