Deep sea squid in Sulawesi Sea, North Sulawesi Province, Indonesia

Abstract

Abstract. Pratasik SB, Lalamentik LTHX, Manoppo L, Budiman J. 2022. Deep sea squid in Sulawesi Sea, North Sulawesi Province, Indonesia. Biodiversitas 23: 1774-1779. This study aimed to identify one of the deep sea squids caught in artisanal fisheries by traditional fishermen in Sulawesi Sea, North Sulawesi Province, Indonesia. Samples were collected using the vertical hand line of traditional fishermen. The specimen was identified using Cytochrome c oxidase subunit 1 (CO1). For morphometric characteristics, all body parts were measured, and each part was compared with mantle size. Results showed that the specimen was identified as purpleback flying squid Sthenoteuthis oualaniensis and had 99.35% similarity to S. oualaniensis (CO1) from China (NCBI - MN101944) with sufficient genetic diversity. Based on the body size, species recorded in the present study belong to the dwarf form, the smallest form of S. oualaniensis groups. The species has the following morphometric characteristics: Head length is 0.28 of mantle length, tentacle length is 1.158 of mantle length, and fin area is 0.5 of mantle length. The fourth arm is the shortest and the second arm is the longest. S. oualaniensis recorded in the present study belonged to dwarf form living in equatorial waters. This finding may contribute to the list of marine resources of fisheries in Indonesian waters.

Growth and mortality model of Chacunda gizzard shad Anodontostoma chacunda (Bleeker, 1852) in Tarakan waters, North Kalimantan, Indonesia

“…Nevertheless, this region is known for its abundant biological resources (Salim et al 2022). Tarakan's waters are adjacent to the waters of Bunyu (Firdaus et al 2022), and both areas are directly connected to three major waters: the South China Sea (Larvet et al 2023), the Sulawesi Sea (Pratasik et al 2022), and the Pacific Ocean (National Academies of Sciences, Engineering, and Medicine 2022).…”

Behavioral response of purpleback flying squid Sthenoteuthis oualaniensis (Mollusk; Cephalopod) to the flashlight artificial bait colors

“…This species is caught commercially in the eastern and southern East China Sea, from Taiwan to Okinawa by hook and line with light at night (Okutani & Tung, 1978;Tung, 1981;Yoshikawa, 1978). The deep-sea squids caught by traditional fishermen of Manado Bay, North Sulawesi, in the Sulawesi Sea have been identified as a dwarf form of S. oualaniensis (Pratasik et al, 2022). These species are highly migratory and undertake diel vertical migrations of several hundred meters and seasonal migrations between the shelf and open ocean (Gilly et al, 2006;Stewart et al, 2013) so that they can act as important linkages between both neritic and oceanic food webs (Arkhipkin, 2013).…”