Population Dynamic and Stock Assessment of Hilsa (Tenualosa ilisha) in the Kuakata Coast of Bangladesh
- Alternative Title
- 방글라데시 쿠아 카타 연안 힐사(Tenualosa ilisha)의 개체군 역학 및 자원 평가
- Abstract
- Studied population dynamic and stock assessment of Hilsa (Tenualosa ilisha) in the Kuakata Coast of Bangladesh. This study aims to estimate relative growth pattern, mortalities, exploitation and stock status of tropical shad, Tenualosa ilisha in Bangladesh. Total number of T. ilisha was collected for this study was 2625 from the Kuakata coast of Bangladesh between June 2020 and February 2021. The minimum and maximum total lengths was 9.00 cm and 50.10 cm, while minimum and maximum total weights was 47.76 and 1257.44 gm, respectively. Mean total length and body weight of T. ilisha was 30.27 (± 9.37) cm and 386.1 (± 229.1) gm, respectively. Length-weight relationship model of T. ilisha was established and the model equation was W = 0.0104L3.0104 (r2 = 0.9259). The natural and fishing mortality was 1.53 yr-1 and 0.88 yr-1, respectively. The calculated exploitation level (E) was 0.63 which was 26% higher than optimum exploitation (E = 0.50). Current yield-per-recruit (YPR) was 69.50 g. Estimated Fmax, F0.1 and F40% were 1.25 yr-1, 0.84 yr-1 and 0.79 yr-1, respectively. Current fishing mortality was estimated at 0.88 yr-1 that was 5% higher than F0.1. The maximum sustainable yield (MSY) of Hilsa was estimated as 471,707 tons. The current production (550,000 tons) of hilsa in Bangladesh waters was 16% higher than the MSY. Therefore, it might be concluded that the stock of hilsa fishery is over exploited condition in Bangladesh waters.
- Issued Date
- 2021
- Awarded Date
- 2021. 8
- Type
- Dissertation
- Keyword
- Population dynamic Length-weight relationship Yield-per-recruit Spawning-per-recruit Overfishing and MSY Of Hilsa Bangladesh
- Publisher
- 부경대학교
- Affiliation
- 부경대학교 세계수산대학원
- Department
- 세계수산대학원 수산자원관리전공
- Advisor
- S. M. Nurul Amin
- Table Of Contents
- CHAPTER 1: INTRODUCTION 1
1.1 Background of the Study 1
1.2 Problem Statement 1
1.3 Objectives 2
CHAPTER 2: LITERATURE REVIEW 2
2.1 Morphology and Taxonomy of Hilsa 2
2.2 Habitat and Distribution 3
2.3 Fishery Status and Importance of Hilsa 3
2.4 Age and Growth of Hilsa 5
2.5 Mortality and Exploitation Rate of the Hilsa 6
2.6 Maximum Sustainable Yield (MSY) of Hilsa 8
CHAPTER 3: MATERIALS AND METHODS 9
3.1 Collection of Data 9
3.2 Data Analysis 10
3.3 Length-Weight Relationship Model 12
3.4 Growth Parameters 12
3.5 Mortality Parameters 13
3.6 Length at First Capture 14
3.7 Recruitment Pattern 14
3.8 Steady State Biomass (SSB) 15
3.9 Yield and Spawning Biomass Per Recruit 15
3.10 Estimation Maximum Sustainable Yield (MSY) 17
CHAPTER 4: RESULTS 18
4.1 Population Structure 18
4.2 Length-Weight Relationship Model 19
4.3 Growth Parameters 20
4.4 Mortality 21
4.5 Exploitation Rate 23
4.6 Length at First Capture 23
4.7 Recruitment Pattern 24
4.8 Steady State Biomass (SSB) 25
4.9 Yield and Spawning Biomass Per Recruit 27
4.10 Maximum Sustainable Yield (MSY) 30
CHAPTER 5: DISCUSSION 32
5.1 Length-Weight Relationship Model 32
5.2 Growth Parameters 33
5.3 Mortality Parameters and Exploitation Rate 34
5.4 Length at First Capture (Lc) 35
5.5 Yield and Spawning Biomass Per Recruit 35
5.6 Maximum Sustainable Yield (MSY) and Steady State Biomass (SSB) 36
CHAPTER 6: CONCLUTIONS 38
6.1 Conclusions 38
REFERENCES 39
- Degree
- Master
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