Marosatherina ladigesi is one of endemic fishes in South Sulawesi and also as ornamental fish. Anthropogenic activities such as destructive fishing and degradation caused by the dredging of sand carried M. ladigesi to the red list of threatened IUCN category as vulnerable species. Accordingly, conservation efforts are needed to maintenance fish population in its habitat. The biologic information for conservation is reproduction of fishes. This research aimed to described reproduction of Celebes rainbow fish including sex ratio, gonad maturity, gonado-somatic index, fecundity, and distribution of egg diameter in Pattunuang and Batu Puteh Rivers, South Sulawesi. This research was conducted from May 2018 to April 2019. The result showed that the sex ratio in Pattunuang and Batu Puteh rivers were 1,00:1,60 and 1,00:1,08, respectively. This species spawned from the end of dry season to the early rainy season. Fecundity of fish in Pattunuang and Batu Puteh rivers were 22-795 eggs and 69-571 eggs, respectively. Based on distribution of egg diameter, Celebes rainbowfish categorized as total spawner. For the conservation of this species is recommended to catch restrictions in the spawning season and for male fish, and needs to be proposed the conservation in situ to determine both of rivers as reservoir area because these habitats are a source of germplasm.

Penelitian ini bertujuan menganalisis aspek hubungan panjang bobot dan beberapa aspek reproduksi ikan tongkol lisong sehingga dapat menjadi dasar dalam pengambilan kebijakan di perairan Teluk Bone. Pengambilan sampel dilakukan di Kelurahan Lonrae, Kabupaten Bone, pada bulan September hingga November 2021 Tipe pertumbuhan diketahui dengan melakukan analisis hubungan panjang bobot, TKG diketahui dengan cara analisis morfologi, IKG dihitung berdasarkan metode Johnson. Hasil analisis hubungan panjang bobot  diperoleh koefisien regresi masing-masing b = 3.3345 pada bulan September dan b = 2,837 pada bulan Oktober dan b = 3,3690 pada bulan November. Hasil uji t diperoleh t hitung >  t tabel sehingga digolongan ikan tongkol pada bulan September dan November ke dalam pola pertumbuhan allometrik positif dan pada bulan Oktober ke dalam pola pertumbuhan allometrik negatif. Faktor kondisi tongkol lisong di Perairan Teluk Bone diperoleh kisaran 0,95-1,03 dengan rata-rata 0,97, pada jantan 1,23-1,44 dengan rata-rata 1,33 dan pada betina diperoleh kisaran 0,72-0,83 dengan rata-rata 0,77.  Nilai IKG yang berkisar antara 0,053 – 0,242  pada ikan jantan 0,052 – 0,068 pada ikan betina. Ikan tongkol yang ditemukan dikategorikan belum matang gonad.

Batetangnga River is one of the rivers in West Sulawesi and is well known as an ecotourism area. This preliminary study was performed to reveal fish fauna in the Batetangnga River, West Sulawesi. Ichthyofauna research was conducted in April and May 2021 at two stations in Batetangnga River, namely Rawa Bangun and Butute’neng. During the study period, a total of 14 species belonging to 9 families were identified. No endemic species were found in the study area. Native fish species such as Stiphodon semoni, Butis butis, Glossogobius sp., Glossogobius aereus, Stiphodon sp., Giuris sp, Atule sp. Ambassis miops, Ambassis interrupta, Microphis sp. were recorded. Four alien fishes species were documented i.e. Aplocheilus panchax, Poecilia reticulata, Anabas testudineus, and Oreochromis niloticus. Freshwater fish exploration and efforts to control alien fishes species in west Sulawesi are essential things to be done shortly.

Abstract. Tenriware, Nur M, Nasyrah AFA. 2023. Biological reproduction of mackerel scad, Decapterus macarellus (Cuvier, 1833) caught by purse-seine net in Majene Waters, West Sulawesi, Indonesia. Biodiversitas 24: 3012-3018. Mackerel scad, Decapterus macarellus Cuvier, 1833 is an economically important fish resource as an income source for fishermen in Majene waters, West Sulawesi. This study aims to determine some aspects of reproductive biology, including sex ratio, gonadal somatic index (GSI), gonad maturity stage (GMS), and the size at the first maturity. The sampling was carried out at the Fish Landing Sites in the Coastal Waters of Pangali-Ali Village, East Banggae District, Majene District, West Sulawesi Province, Indonesia. Each specimen was measured to the total length with digital calipers and body weight using a digital weighing scale. Initial sex assessment was noticed at the time of dissection, and gonadal maturity was also assessed. A total of 275 specimens consisting of 177 males and 98 females were obtained from April to July 2017. The result indicates that the sex ratio between males and females deviated from an expected 1:1: and was not balanced. This species spawns in April at the size of 173.4 mm and 168.6-178.3 mm for males and 189.1 mm or the range of 182.6-195.8 mm for females.

Ikan cakalang tergolong sebagai jenis ikan pelagis penting yang bernilai ekonomis tinggi. Tujuan penelitian ini yaitu untuk mengetahui pola pertumbuhan dan berbagai aspek reproduksi ikan cakalang sehingga dijadikan landasan dalam strategi pengelolaan ikan cakalang di Teluk Bone. Pengambilan sampel dimulai pada bulan Juli hingga September 2022 pada lokasi yang merupakan fishing-base nelayan yaitu di Kelurahan Lonrae, Kabupaten Bone, Sulawesi Selatan. Prosedur penelitian meliputi pengambilan sampel secara acak kemudian dimasukkan ke tempat ikan dan dilanjutkan dengan  membawa sampel ke Laboratorium untuk dianalis. Parameter yang diteliti dan metode pada penelitian ini antara lain pola pertumbuhan ikan cakalang yang dianalisis  melalui hubungan panjang bobot, nisbah kelamin dengan analisis “Chi-Square”, dan Indeks kematangan gonad dengan metode Johnson. Hasil penelitian ini, menunjukkan diperoleh koefisien regresi b = 3.481 pada gabungan ikan jantan dan ikan betina, koefisien regresi b = 3.597 khusus pada ikan jantan dan b = 3.419 khusus pada ikan betina. Hasil uji t  terhadap nilab b menunjukkan t hitung >  t tabel sehingga ikan cakalang pada penelitian ini tergolong memiliki pola alometrik positif. Faktor kondisi ikan cakalang betina lebih tinggi dibanding ikan jantan, pada gabungan jantan dan betina diperoleh kisaran 1.12-2.10 (rata-rata 1.39), khusus ikan jantan diperoleh 1.12-2.1  (rata-rata 1.32) dan kisaran 1.19-1.80 (rata-rata 1.50) pada ikan cakalang betina.  Indeks kematangan gonad ikan cakalang diperoleh nilai yang berkisar antara 1.176 – 3.448  pada jantan 1.795 – 4.167 pada ikan betina. Terkait dengan tingkat kematangan gonad yang diamati selama penelitian masih dikategorikan belum matang gonad.