Author(s): Yoppy Jutan, ASW Retraubun, AS Khouw, VPH Nikijuluw and JA Pattikawa

Abstract: Halmahera walking shark (Hemiscyllium Halmahera) is an endemic species that only found in Halmahera Islands, Indonesia at shallow waters on coral reef. The research to study population of Halmahera walking shark was conducted in Kao bay, North Maluku on March 2017 to February 2018. Samples collected during night dive were measured and analysed by using FiSAT program. Totally, 604 individuals of Halmahera walking shark were collected during the study with the total length ranging from 16.9-79.0 cm. The von Bertalanffy growth function for this species is L_t = 81.25 [1–e^{-0.51(t+0.24)}]. Recruitment occurred all year round with the major peak between July and September. Mortality rates of Halmahera walking shark were 1.89, 0.90 and 0.99 for total, natural and fishing mortalities, respectively with exploitation rate was 0.52. The values of E max, E 0.50 and E 0.10 estimated by yield per recruit method were 0.375, 0.245 and 0.307, respectively. As current exploitation ratio, E=0.52 > EMSY=0.245, it seems that population of walking shark in this area is over-exploited

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