Multi-species assessment and management implications of lobster fisheries in Gunungkidul waters, Indonesia
- Alternative Title
- 인도네시아 구능키들 해역 닭새우 어업의 다종 평가 및 관리 방안
- Abstract
- This study is to examine the stock status and biological reference points for the multi-species lobster fishery in Gunungkidul waters. Some biological reference points were estimated from the multi-species yield per recruit and spawning stock biomass per recruit (SSB/R). The overfishing status of this fishery was detected, based on the recent fishing effort which was higher than the effort level of maximum sustainable yield. This study found that the lobster stock was overfished, since the recent biomass of the stock was less than the optimal biomass. For stock rebuilding, the biomass was expected to reach the optimal level after 4 years by the 29% reduction of the current fishing effort. Based on the multi-species spawning stock biomass per recruit analysis, P. penicillatus had the lowest spawning stock biomass, which should be the indicator as the target reference point to manage the lobster fishery. For the sustainability of multispecies fishery in Gunungkidul waters, not only the reduction of fishing effort, but also the ABC setting as 26,145 kg and the optimal size of lobsters as 68 mm for P. homarus, 74 mm for P. penicillatus and 64 mm for P. longipes, need to be implemented effectively.
- Issued Date
- 2021
- Awarded Date
- 2021. 8
- Type
- Dissertation
- Keyword
- Maximum sustainable yield multi-species Panulirus homarus P. penicillatus P. longipes recruitment overfishing
- Publisher
- 부경대학교
- Affiliation
- 부경대학교 세계수산대학원
- Department
- 세계수산대학원 수산자원관리전공
- Advisor
- Chang Ik Zhang
- Table Of Contents
- I. Introduction 1
II. Materials and Methods 5
2.1. Materials 6
2.2. Methods 12
2.2.1. Population ecological characteristics 12
2.2.1.1. Growth parameters 12
2.2.1.2. Mortalities and exploitation rate 14
2.2.1.3. Length at maturity 15
2.2.1.4. Length at first capture 15
2.2.2. Management reference points 16
2.2.2.1. Status of aggregated lobster stocks 16
2.2.2.2. Multi-species yield per recruit (YPR) 18
2.2.2.3. Multi-species spawning stock biomass per recruit (SSBR) 19
III. Results 22
3.1. Population ecological characteristics 22
3.1.1. Growth parameters 22
3.1.2. Mortalities and exploitation rate 25
3.1.3. Length at maturity 28
3.1.4. Length at first capture 29
3.2. Management reference points 30
3.2.1. Status of aggregated lobster stocks 30
3.2.2. Multi-species yield per recruit (YPR) of lobster fishery 34
3.2.3. Multi-species spawning stock biomass per recruit (SSBR) of lobster stock 39
3.3. Fisheries management recommendations 41
IV. Discussion 44
V. Conclusion 53
References 54
Acknowledgement 61
Appendix 62
- Degree
- Master
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