Biological aspects of juvenile great hammerhead sharks Sphyrna mokarran from the Arabian Gulf
Hua Hsun Hsu A C , Zahid Muhammed Nazeer A , Yu Jia Lin A , Premlal Panickan A , Khaled Al-Abdulkader B , Ronald Loughland B and Mohammad Ali Qurban A
+ Author Affiliations
- Author Affiliations
A Marine Studies Section, Center for Environment and Water, Research Institute, King Fahd University of Petroleum and Minerals, PB No. 2094, Dhahran 31261, Saudi Arabia.
B Environmental Protection Department, Saudi Aramco, P.O. Box 18597 Al Midra, Dhahran 31311, Saudi Arabia.
C Corresponding author. Email: hsuhuahsun@yahoo.com.tw
Marine and Freshwater Research 72(1) 110-117 https://doi.org/10.1071/MF19368
Submitted: 26 November 2019 Accepted: 24 March 2020 Published: 18 April 2020
Abstract
The life history of the critically endangered great hammerhead Sphyrna mokarran was examined using samples collected from commercial fisheries operating in Saudi Arabian waters of the Arabian Gulf. In all, 105 specimens (47 males, 58 females), with a total length (TL) ranging from 67.0 to 236.0 cm, were examined between April 2016 and November 2019. All individuals were immature. A neonate measuring 67.0 cm TL caught in early June suggested the parturition period of this species was during May and June. Vertebrae under the first dorsal fin from 69 individuals (30 males, 39 females) were processed. Three age groups, from 0+ to 2+ years old, were identified by vertebrae analysis. Based on the relationship between vertebral central diameter and TL, the Fraser–Lee approach was used to back-calculate the growth history of TL. A two-parameter von Bertalanffy growth function provided the best fit to describe early growth of great hammerheads during 0–2.9 years of age based on observed and back-calculated length-at-age data. The asymptotic lengths and k values were estimated to be 256.8 cm TL and 0.449 year–1 respectively. This study provides the first life history information of great hammerhead sharks in the north-western Indian Ocean.
Additional keywords: band pair, fishery, life history, vertebra.
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