Pemanfaatan sumberdaya alam pesisir yang optimal seharusnya dilakukan pada lokasi-lokasi yang sesuai. Perairan Kecamatan Monano sebagai salah satu wilayah yang memiliki sumberdaya pesisir dan laut yang cukup melimpah sangat potensial untuk pengembangan budidaya laut khususnya untuk budidaya ikan Kerapu (Epinephelus sp.) pada Keramba Jaring Apung (KJA). Informasi berupa data mengenai kelayakan lokasi yang menjadi salah satu faktor penentu berhasil tidaknya suatu usaha budidaya belum tersedia. Oleh karena itu perlu adanya kajian ilmiah yang bertujuan untuk menganalisis kesesuaian lahan budidaya Ikan Kerapu sistem Keramba Jaring Apung (KJA) di Kecamatan Monano. Pengambilan data dilakukan pada delapan stasiun yang ditentukan secara purposive sampling dari pengamatan secara langsung di lapangan dan pengamatan kualitatif melalui interpretasi image satellite google Kecamatan Monano Kabupaten Gorontalo Utara, sehingga diperoleh gambaran umum lokasi dan kondisi biofisik perairan. Pengukuran parameter lingkungan dan kualitas air dilakukan secara insitu dan analisis laboratorium. Pengambilan sampel air dilakukan sesuai petunjuk Effendi (2003). Analisis data menggunakan modifikasi matriks kesesuaian, indeks kesesuaian dan kelas kesesuaian kemudian dianalisis secara spasial dengan pendekatan Sistem Informasi Geografis (SIG) menggunakan program Arc GIS 10.3.1. Berdasarkan peta kesesuaian lahan, diperoleh luas lahan yang sangat sesuai untuk budidaya ikan kerapu sistem keramba jaring apung adalah 417 ha. Sedangkan yang cukup sesuai adalah 2496 ha. Kata kunci: kesesuaian lahan; keramba jaring apung; ikan kerapu.
Environmental DNA (eDNA) methods are increasingly viewed as alternate or complementary approaches to conventional capture-based surveys for marine conservation and fisheries management purposes, especially at large spatial scales in mega-biodiversity regions such as Indonesia. Decapod crustacean distribution and diversity across Indonesia are still poorly known, even for economically important fisheries commodities. This study assessed coral reef associated decapod diversity and distribution by sampling 40 sites in three regions (West, Central, East), representing 17 provinces and 10 Fisheries Management Areas (FMAs) across Indonesia, with a special focus on the blue swimming crab Portunus pelagicus. DNA sequencing (Illumina iSeq100) data were analysed in mBRAVE (Multiplex Barcode Research And Visualization Environment) yielded 406 OTUs belonging to 32 families, with 47 genera and 51 species identified. The number of families identified was highest in the Central region (25), while the most genera (31) and species (36) were identified in the West region. Alpha diversity did not differ significantly between regions or provinces, while Beta diversity differed significantly between provinces but not between regions. Our results also showed 31 species are possibility native based on the distribution meanwhile 12 species do not appear to have been recorded based of SeaLifeBase or WorMS. While providing a reference for further exploration of Indonesian coastal and small island decapod biodiversity, the high proportion of unidentified taxa calls for concerted efforts to develop and maintain reference specimen and sequence repositories and expand species conservation status assessments. The economically important decapod crustaceans identified in this study included three crabs (Charybdis anisodon, Charybdis japonica, Portunus pelagicus), a freshwater prawn (Macrobrachium nipponense), a lobster (Panulirus stimpsoni) and two penaeid shrimps (Mierspenaeopsis hardwickii and Trachysalambria aspera). For most decapod taxa, observed patterns indicate management under existing provincial and/or FMA level management structures is appropriate. Furthermore, the data can inform science-based fisheries management strategies, in particular for P. pelagicus.
The model of the skipjack tuna resource management that can provide maximum rent can be done with a clear ownership regime (sole owner) or in the condition of MEY balance. However, the management and utilization of skipjack tuna resources must also consider the factors that can result in overfishing of both biological and economics overfishing. This study aims to assess the management and utilization of skipjack tuna fisheries resources in North Gorontalo Regency using a bioeconomic approach. Data processing is done by approaching the bioeconomic model using skipjack tuna fisheries biological and economic parameters. The results showed that the maximum rent obtained in skipjack fisheries in North Gorontalo Regency was at the MEY regime compared to the MSY and OA regime. However, based on the actual data obtained, it is known that the average production of skipjack tuna in North Gorontalo Regency has not reached the optimum catch value in the equilibrium condition of MSY (hMSY ), but in some period the actual catch value has passed the optimal catch value (hMSY ), this means that skipjack tuna has overfished (biological overfishing). While the actual production value of skipjack tuna catches in North Gorontalo Regency has passed the production of optimum MEY (hMEY ). This condition indicates that actually skipjack tuna resources have experienced an economic overfishing.
Indian mackerel (Rastellinger kanagurta) is one of the fish that can be caught by fishermen in North Gorontalo waters. Excessive fishing without regard to the condition of the fish will cause a decrease in the quality and quantity of fish resources. Estimation of size at first maturity is one way to determine population development in water. This study aims to determine the relationship between the level of gonad maturity and the fecundity of Indian mackerel in North Gorontalo waters. This research was conducted in October-December 2021 at the Kwandang Archipelago Fishing Port. The level of maturity of the gonads was observed morphologically and the determination of fecundity was observed using volumetric and gravimetric methods. The maturity level of Indian Mackerel fish in North Gorontalo waters is dominated at level 1. The highest fecundity is 14,800 eggs and the lowest is 5,000 eggs. The relationship between the level of gonad maturity and fecundity is directly proportional, if the gonadal maturity value is high, the fecundity value will also be higher. The spawning season for Indian mackerel in North Gorontalo waters does not take place in October-December, this is characterized by low fecundity. Based on the gonadal maturity values every month, the peak spawning of Indian mackerel (Rastellinger kanagurta) allegedly occurred shortly after the highest GSI values.
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