Sock Structure, Age and Growth, and Spatio-Temporal Distribution of Iucn Critically Endangered Species -- Scalloped Hammerhead Shark, Sphyrna Lewini, in the Western North Pacific(II)

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Project title

Code/計畫編號

MOST108-2313-B019-004-MY3

Translated Name/計畫中文名

西北太平洋IUCN極危物種--紅肉丫髻鮫之系群、年齡與成長及時空分布研究(II)

Project Coordinator/計畫主持人

Kwang-Ming Liu

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Institute of Marine Affairs and Resource Management

Website

https://www.grb.gov.tw/search/planDetail?id=13333091

Year

2020

Start date/計畫起

01-08-2020

Expected Completion/計畫迄

31-07-2021

Bugetid/研究經費

1700千元

ResearchField/研究領域

漁業

紅肉丫髻鮫(Sphyrna lewini)為海洋生態系中頂端的掠食者，其資源變動在生態系中有著舉足輕重的影響。CITES已將其列入附錄II名錄，而IUCN最新的評估將其保育等級提升至極危(Critically Endangered, CR)。紅肉丫髻鮫是臺灣主要的鯊魚漁獲物種之一，早期臺灣曾對此物種做過年齡與成長、生殖生物學之研究，近期也有利用族群統計學估計生物參數以及食性分析之研究。然而有關西北太平洋本種的系群結構及不同生活史階段時空分布之研究仍然闕如，其脊椎骨成長帶形成週期仍未有定論，這些研究缺口阻礙了本種的資源評估與管理的進行。因此，本計畫將針對西北太平洋之紅肉丫髻鮫，進行(1)利用微衛星DNA技術進行系群判別分析，並且透過國際交流合作，分析日本海域之樣本，以確定紅肉丫髻鮫系群結構。(2)重新進行紅肉丫髻鮫之年齡成長研究，除了利用傳統脊椎骨讀輪方式，並配合放射性碳同位素定齡方法，以確認成長帶形成週期，並探討該物種是否受到漁獲壓力而導致成長參數之改變。(3)利用脊椎骨元素分析與漁獲時空分布，探討紅肉丫髻鮫不同生活史階段棲息的環境及偏好，並進一步推測紅肉丫髻鮫洄游路徑、時空分布。最後，透過本研究之執行，能確實掌握臺灣週邊海域該物種之生活史特性、時空分布及棲地利用，並可提出針對紅肉丫髻鮫資源管理更具體且有效的建議。The scalloped hammerhead shark, Sphyrna lewini, is an apex predator that plays an important role in the marine ecosystem. This species has been listed on CITES Appendix II and IUCN has updated its stock status to “critically endangered, CR” in recent assessment. The scalloped hammerhead shark is one of the major shark catch in Taiwanese fishery, and its reproductive biology and age and growth have been studied decades ago, and its feeding ecology has been conducted recently. However, the stock identification and spatial-temporal distribution of this species in the western North Pacific are still unknown. In addition, the periodicity of band pair deposition of vertebral centrum is still uncertain. The stock assessment and management of this species were hindered by these research gaps. Therefore, this study aims to (1) identify the stock structure of scalloped hammerhead in the western North Pacific based on the samples from Taiwan and Japan using micro satellite locus analysis, (2) re-estimate the age and growth parameters, and validated by using bomb radio carbon technique, the fishing impact on growth parameters will be examined, (3) examine the spatio-temporal distribution and habitat preference for scalloped hammerhead in different life stages by using element analysis of vertebral centrum and fisheries catch data. The results derived from this study can update the life history parameters and provide solid and sound management recommendations to ensure the sustainability of the scalloped hammerhead stock in this region.

Keyword(s)

紅肉丫髻鮫
系群判別
微衛星基因座
年齡成長
脊椎骨
放射性碳同位素
元素分析
時空分佈
Sphyrna lewini
Stock identification
Microsatellite locus
Age and growth
Vertebral centrum
Radiocarbon
Element analysis
Spatio-temporal distribution

DSpace CRIS

Sock Structure, Age and Growth, and Spatio-Temporal Distribution of Iucn Critically Endangered Species -- Scalloped Hammerhead Shark, Sphyrna Lewini, in the Western North Pacific(II)

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