Penelitian ini bertujuan untuk mengetahui faktor oseanografi dan tingkat kesesuaian lokasi perairan Pulau Sembilan dalam mendukung budidaya rumput laut Kappaphycus alvarezii.  Penelitian ini dilaksanakan pada Bulan Juni – Oktober 2019.   Penentuan lokasi budidaya  rumput laut,  dipilih berdasarkan kriteria sengaja ( purposive sampling ).  Hasil penelitian memperlihatkan kisaran nilai: a) Parameter fisika terdiri atas: (1) arus  5 – 30 cm/dtk, (2) suhu     28,7 - 32 °C (3) kedalaman sebesar 2 m - 10 m, (4) kecerahan 1 m - 3,5 m, (5) substrat dasar perairan karang, berpasir (b) Parameter Kimia terdiri dari: (1) salinitas perairan 30 ppt - 32,8 ppt, (2) pH  7,37 - 9,31 (3) oksigen terlarut 4,16 - 11,08 mg/l  (4) carbon dioksida 2 - 6 mg/l (5) fosfat 0,044 mg/l – 1,185 mg/l, (6) nitrat 0,046- mg/l- 1,104 mg/l. c) Parameter biologi terdiri atas: organisme pengganggu berupa ikan dan lumut. Hasil skoring menunjukkan untuk ketiga stasiun dapat dilakukan kegiatan budidaya Kappaphycus alvarezii yaitu pada Pulau Kambuno, Batanglampe dan Kodingare.   This study aims to determine oceanographic factors and the suitability of the waters of the nine islands in supporting seaweed cultivation Kapphaphycus alvarezii.  The research was conducted in June-october 2019.  Determination of a proposed seaweed cultivation area, was conducted bu using conformity criterias based on the results matrix scoring and weighting. The results showed a range of values: a) physical parameters consist of (1) the flow velocity of  5 cm/s to 30  c m/s (2) water temperature      28,7 ºC to 32 ºC, (3) the depth of 2 m to 10 m, (4) brightness of 1 m to 3,5 m, (5) water bottom material types include: sand and coral, b) Chemical parameters consist of:  (1) salinity waters 30 ppt to 32.8 ppt,   (2) pH 7,37 to 9.31, (3) dissolved oxygen 4,16 to 11,08 ppm (4) carbondioksida 2 to 6 ppm ,(5) phosphate 0.044 mg/l to 1.104 mg/l, (4) nitrate 0,046  mg/l to 1.104 mg/l. c) Biological parameters consist of disturbing organism such as fish and mosses.  Scoring results show for the three station can be used for farming Kappaphycus alvarezii activities in the islands Kambuno, Kodingare and Batanglampe.

Short mackerel are caught with high intensity by the fisherman and using various fishing gear.  It is feared that this activity could change the reproduction habits of short mackerel in ther habitat. This study aims to analyze the bio-dynamics reproduction of short mackerel, including sex ratio, maturity stage, length at first maturity, length at first spawning, and fecundity. The survey method obtained the sample collection from the fish landing sites. Samples were collected in 1320 samples consisting of 651 females (13.0-16.5 cm) and 669 males (13.3-17.4 cm). The results showed that the sex ratio was balanced (1.00:1.02), the stage of gonad maturity showed from immature gonad to spawning (I to V), and the highest gonad maturity index for males and females were found in July (1.609 and 1.794). The length at first maturity of males and females had occurred when they were 16.51 cm and 16.63 cm, and the length at first spawning for males and females was 17.12 cm and 17.03 cm in size. The fecundity of female mackerel ranges from 30.106 to 58.439 in the northern waters of Makassar Strait. Capturing fish is suggested with a length above the spawned fish (>17 cm), considering that the fish only spawn at least once from their life cycle. The fecundity of short mackerel is relatively high as an indicator of high reproductive potential.