HighlightThe best salinity for the thallus growth of K. alvarezii is 32 mg/LThe salinity indicates the osmotic balance of K. alvarezii seaweedThis osmoregulation process affects the nutrient absorption of K. alvarezii seaweedThis study aims to develop the availibility of superior seeds of K. alvareziiAbstract Kappaphycus alvarezii is one of the leading commodities in Indonesian waters. Demand for this commodity is quite high, as reflected in the increasing volume of exports each year. Fulfillment of these demands is obtained from the production of cultivation. Generally farmers get natural seaweed seedlings, namely cuttings from existing seaweed. The continuous use of seeds from nature can cause deterioration in the quality and quantity. Handling the problem of quality deterioration from seaweed seeds originating from nature, can be overcome by multiplying the seeds through tissue culture methods in vitro. In term of tissue culture techniques method, the most important thing to note is environmental parameters. An environment parameter that changes suddenly such as salinity can inhibit the growth of seaweed. Thus, this work is attampting the different salinity treatment on seaweed explants K. alvarezii. This study aims at determining (weight) the explants of K. alvarezii with a comparison of the different salinity levels in the in vitro tissue culture method. The method used in this study was a completely randomized design (CRD) with the different salinity treatments namely 30, 31, 32, 33, and 34 ppt. The results showed that the different salinities influenced the growth rate of K. alvarezii seaweed explants with the best explant growth at the salinity of 31 ppt, while the lowest growth value was obtained at 34 ppt
Buah dari beberapa jenis mangrove dapat digunakan sebagai bahan baku olahan pangan yang saat ini mulai berkembang dengan pesat. Sebagai upaya pemenuhan tersebut maka upaya pengelolaan mangrove dan lingkungan perlu segera dilakukan sehingga ke depan olahan bahan pangan tersebut semakin berkembang dan berfungsi sebagai sumber bahan pangan. Buah lindur dapat diolah menjadi aneka produk makanan seperti kue, cake, dicampur dengan nasi atau dimakan langsung dengan bumbu kelapa. PKM ini dilakukan dengan tujuan memberikan pengetahuan kepada masyarakat tentang teknik pengolahan buah mangrove Bruguiera gymnorrhiza berbasis IPTEK dan teknologi tepat guna. Luaran PKM adalah produk hasil olahan buah mangrove yang memiliki nilai jual yang tinggi yaitu kue kering good time, dan selai dau. Pelaksanaan pengabdian di Desa Maitara Utara Kecamatan Tidore Utara pada bulan September 2021. Metode pelaksanaan kegiatan Pengabdian Kemitraan Masyarakat meliputi : metode survey, metode sosialisasi, metode ceramah, metode praktek, metode pengujiam organoleptic dan metode pendampingan. Kegiatan PKM berdampak positif terhadap masyarakat karena menambah pengetahuan masyarakat tentang pengolahan buah mangrove Bruguiera gymnorrhiza sebagai bahan makanan. Kegiatan platihan ini dianggap berhasil karena semua peserta pelatihan begitu bersemangat dan antusiasme dalam menekuni pelatihan olahan buah mangrove sebagai produk kue good time dan selai dau, hasil uji organoleptik semua produk disukai oleh responden dan produk Good Time merupakan produk yang memiliki nilai skoring lebih tinggi. Terbentuknya kelompok wirausaha “Mari Rasa Kreatif” dalam rangka keberlanjutan kegiatan pelatihan.
Skipjack tuna is a migratory species that migrate globally throughout the ocean. The North Maluku Sea has a big potency on skipjack, this resource has been exploited intensively and gave the negative impact on skipjack population. The genetic data is one of the important information to strategy a better sustainable fisheries management. Hence, the aims of the study were to analyze the genetic diversity data in North Maluku Sea. The samples were collected from three locations, namely Morotai Island, South Halamera and Bacan. A total of 10 samples were collected from every location. The samples were extracted with Chelex 10%, and processing for PCR and sequencing. The results showed that molecular characteristics in skipjack are 546 (bp). The genetic diversity was ranged from 0.800-1.000 with the total of 28 haplotypes of 30 samples. The genetic diversity is included in high/undisturbed criteria and showed the population still in stable condition.Ikan Cakalang merupakan migratori spesies yang bermigrasi secara global di seluruh samudera. Potensi ikan cakalang sangat tinggi di perairan laut Maluku Utara. Pemanfaatan sumberdaya ikan cakalang sudah dilakukan lama dan terus menurus sehingga berdampak pada penurunan, oleh karena itu perlu segera dilakukan pengelolaan secara berkelanjutan. Data genetik merupakan salah satu informasi penting untuk menyusun rencana pengelolaannya di perairan laut Maluku Utara. Oleh karena itu penelitian ini bertujuan untuk melakukan analisis keragamana genetik ikan cakalang di perairan Maluku Utara. Sampel ikan diperoleh dari tiga lokasi, yaitu Pulau Moratai, Halamera Selatan dan Bacan, masing-masing lokasi dengan 10 sampel. Hasil penelitian diperoleh karakteristik molekuler pada ikan cakalang 546 (bp). Keragaman genetik ditemukan berkisar 0.800-1.000 dengan jumlah 28 jaringan haplotipe dari 30 sampel. Nilai keragaman genetik masuk dalam kriteria tinggi/baik, sehingga bisa dikatakan bahwa populasi ikan masih dalam kondisi stabil.
Kappaphycus alvarezii seaweed is one of the important economically valuable commodities. Kappaphycus alvarezii is one of the macro algae species that has many benefits. Kappaphycus alvarezii seaweed cultivation is the dominant mariculture activity on Panggang Island, DKI Jakarta. The condition of the quality of the aquatic environment greatly affects the production of Kappaphycus alvarezii seaweed. This study aims to analyze the suitability level of Kappaphycus alvarezii seaweed cultivation in the dry season and rainy season. This research was carried out in Panggang Island, DKI Jakarta during the dry and rainy seasons. The observed environmental quality parameters include the physical physics parameters, namely temperature, current speed, brightness, and depth observed in situ. Aquatic chemical parameters namely salinity, pH, dissolved oxygen observed in situ and nitrates and phosphate observed in ex-situ. In order to get a classification of the suitability level, the suitability of the marine matrix is made through scoring and weighting on the parameters limiting seaweed farming activities. Based on the results of the study it can be concluded that the suitability of the waters on Panggang Island, DKI Jakarta is very suitable (Sl) for Kappaphycus alvarezii cultivation both during the planting period in the dry season or the rainy season.
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