Salah satu daerah penghasil kepiting bakau terbesar di Kabupaten Bone adalah Kecamatan Cenrana. Peningkatan jumlah produksi kepiting bakau pada tahun 2016 adalah sumbangsi terbesar dari Kecamatan Cenrana. Akan tetapi, seiring permintaan kepiting bakau di Kabupaten Bone terus meningkat, jumlah produksinya belum mampu memenuhi permintaan pasar kepiting bakau meskipun produksinya pernah mengalami peningkatan. Penelitian ini bertujuan untuk menganalisis pengaruh input produksi (lahan tambak, benih, pakan dan tenaga kerja) terhadap produksi kepiting bakau. Penelitian ini dilaksanakan di Kecamatan Cenrana, Kabupaten Bone, Penentuan lokasi dilakukan secara sengaja (purvosive). Penelitian ini dilaksanakan pada Bulan Februari sampai dengan Maret 2018. Responden dalam penelitian ini adalah petani kepiting bakau yang dipilih menggunakan metode sampling sebanyak 92 orang. Adapun analisis data yang digunakan yaitu analisis regresi berganda dengan metode Ordinary Least Square (OLS), model yang digunakan adalah persamaan fungsi produksi Cobb-Douglas. Hasil penelitian menunjukkan bahwa peningkatan produksi kepiting bakau dipengaruhi oleh faktor lahan tambak (0,231), benih (0,459), pakan (0,155) dan tenaga kerja (0,238) dan berpengaruh positif dan signifikan terhadap produksi kepiting bakau. Produksi kepiting bakau akan semakin meningkat karena ada potensi peningkatan produksi kepiting bakau dengan adanya kepastian ketersediaan benih melalui perbaikan habitat mangrove yang lebih baik, peraturan penangkapan induk kepiting bakau yang bertelur dan perbaikan lingkungan akibat pencemaran disekitar hulu Sungai Cenrana Kabupaten Bone.
The objective of the study was to analyze the relationship between coral reef cover and abundance of reef fish in Marine Tourism Park of the Kapoposang Islands, South Sulawesi. This research was conducted on April 2019. Collecting coral cover data using the Underwater Photo Transect (UPT) method and coral fish data collection using Underwater Visual Census (UVC) with belt transects. The research results of coral fish found in the study site were 15 families and 54 species. The highest abundance of reef fish was foun d at site I, which was 6280 ind/ha with a percentage of live coral cover of 34% (Moderate), while the lowest abundance w as found at site III of 2100 ind/ha with a percentage of live coral cover of 5% (Poor). The relationship between the abundance of reef fish and the percentage of live coral cover can be seen in the results of the regression analysis of the value of r 2 = 0.942, this value indicates that there is a close relationship between abundance of reef fish with the percentage of live coral cover, that is if the coral cover percentage is getting better then the number of fish more abundant coral.
Ikan Siganus merupakan ikan herbivora yang hidup di padang lamun sebagai tempat asuhan, pembesaran, dan tempat mencari makan. Namun, Informasi tentang ikan Siganus di padang lamun Teluk Maccini Baji, Pulau Tanakeke, Kabupaten Takalar masih terbatas. Tujuan penelitian ini yaitu untuk menentukan struktur jenis dan ukuran ikan Siganus di Teluk Maccini Baji, Pulau Tanakeke, Kabupaten Takalar, dan mengetahui kondisi lamun yang meliputi kerapatan, persen tutupan dan dominansi jenis lamun. Penelitian ini dilakukan mulai bulan Juni sampai dengan Desember 2019. Stasiun sampling dipilih berdasarkan tipe ekosistem padang lamun dari arah luar teluk ke arah dalam teluk yaitu stasiun Lamun-Karang, Lamun-Lamun, dan Lamun-Mangrove. Pada masing-masing stasiun, ditentukan luasan 50x100 m untuk pengambilan sampel ikan sebanyak delapan kali ulangan (hauling), dengan menggunakan gill net (panjang 50 meter; lebar 50 cm; ukuran mata jaring 1,5 inci) yang ditarik dengan perahu motor. Pengambilan data lamun juga dilakukan di dalam setiap stasiun. Tiga transek garis diletakkan dalam masing-masing stasiun dengan interval 50 meter. Sepanjang transek garis, dilakukan pengamatan lamun di dalam kuadran 50x50cm, sebanyak 6 kuadran dengan interval 10 meter. Jumlah keseluruhan ikan Siganus yang ditemukan sebanyak 51 ekor yang umumnya tergolong remaja. Komposisi jenis ikan Siganus yang ditemukan pada lokasi penelitian yaitu S. canaliculatus, S. guttatus, S. punctatus, S. spinus, dan S. virgatus. Kerapatan lamun total berkisar antara 668 ind/m2. hingga 1595 ind/m2, dengan penutupan lamun berkisar 36,4% hingga 56,9%. Komposisi jenis lamun yang ditemukan pada lokasi penelitian ini yaitu Cymodocea rotundata, Enhalus acoroides, Halophila ovalis, Syringodium isoetifolium, dan Thalassia hemprichii
Understanding the mechanisms that determine the critical habitat of commercial species is one of the significant challenges in marine science, particularly for species that inhabit the vast ocean worldwide. Previous investigations primarily focused on determining skipjack habitats without considering the feasible size for sustainable fisheries. To define habitat hotspots and movement patterns for decently sized skipjack tuna (≥50 cm) in Indonesia Fisheries Management Area (IFMA) 713, Indonesia, we examined the remote sensing of synoptic sea surface temperature (SST) and chlorophyll-a concentration (Chl-a) measurements with catch data from 2007 to 2016. A new skipjack tuna habitat model was developed based on the link between the key satellite-based environmental data and the best tuna fishery performance using a combination of generalized additive models (GAMs) and kernel density estimates. The findings reveal that feasible skipjack catch sizes were found in approximately 27% of total fishing grounds and were significantly captured in areas with a Chl-a of 0.15–0.28 mg m−3 and an SST of 29.5–31.0 °C, corresponding with an elevated skipjack habitat index (SHI). The habitat hotspots for the commercial skipjack were particularly produced by favorable Chl-a and SST, in association with Chl-a front and anticyclonic and cyclonic eddies, especially in October, which coincided with the highest skipjack catch per unit effort (CPUE). Skipjack distributions were mostly found within 10 km of favorable feeding habitats. They used the hotspot area as an indicator of their dynamics and movement pattern in the environment. The observed CPUEs cross-validated the predicted SHI values, suggesting that the model provided a reliable proxy for defining the potential habitats and the spatial movement of mature skipjack schools. Our findings have global significance for locating ecological hotspots, monitoring sustainable skipjack fisheries, and tracking skipjack migration, especially within the western tropical Pacific.
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