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This study aimed to determine the effects of fermented feed using probiotics and laser-firing to accelerate the mature broodstocks and seed productions of African catfish (Clarias gariepinus). Fish has used male and female broodstocks of catfish. The method was used a completely randomized design with three treatments: unfermented feed as control, probiotic-fermented feed (PFF), and probioticfermented feed+laser firing (PFF+Li). In the first study, a laser-firing dose of 1.125 Joule was performed on fish broodstocks every 15 days. The gonadal maturity time of male and female broodstocks was observed. The second study, treated female broodstocks, was mated with mature male broodstocks without any prior treatments (control). Fertilization rate, hatching rate, and seed production performances such as survival rate and total length were measured. The results showed that treatment of PFF+Li has a significant effect (P<0.05) on the gonadal maturity time of males and females. This treatment reaches the fastest time to mature of the female gonad (31-41 days) and the male gonad (32-37 days) than other treatments (P<0.05). This treatment also produced the highest fertilization, hatching, and survival rates of more than 90%, respectively, and the highest seed yield of 2.1-3.0 cm size compared to other treatments (P<0.05) in African catfish.

Produk mikroalga mengalami peningkatan dari waktu ke waktu karena berpotensi menghasilkan beragam bahan kimia dan senyawa aktif biologis seperti vitamin, pigmen karotenoid, protein, lipid dan polisakarida. Selain itu produk mikroalga ini diminati karena memberikan nilai manfaat ekonomi terkait dengan eksploitasi kultur mikroalga secara massal. Namun didalam pelaksanaanya masih banyak ditemukan kendala untuk memproduksi mikroalga ini karena ada beberapa cara budidaya untuk menghasilkan produk mikroalaga yang optimal. Untuk memecahkan masalah ini diperlukan pelatihan dan pendampingan. Tujuan kegiatan pelatihan untuk memberikan informasi dan pengetahuan tentang cara kultivasi spirulina dengan harapan merangsang peserta pelatihan untuk menekuni usaha berbasis spirulina sehingga dapat menggerakkan ekonomi berbasis spirulina. Hasil pelatihan kultivasi spirulina ini bagi peserta didik diperoleh informasi baru mengenai potensi dan manfaat ekonomi dari budidaya spirulina sebagai sumber pakan, sumber pangan dan energi alternatif yang terjangkau dengan teknologi sederhana yang dapat digunakan untuk mewujudkan kemandirian.

Zooplankton and phytoplankton have an ecological function as primary producers in the food chain, so they are often used as a scale for measuring water fertility. The aim of the study was to determine the community structure of zooplankton and phytoplankton in terms of the level of diversity, level of uniformity, and level of dominance in the gastric contents of the Komo Tuna (Euthynnus affinis) caught by fishermen in Lamongan Waters. Sampling of the Komo Tuna fish was carried out from the catches of fishermen in Lamongan Waters. The experimental method was through direct observation of the types of zooplankton and phytoplankton in the gastric contents of the Komo Tuna fish. Analysis of zooplankton and phytoplankton community structure data in the stomach contents of the Tuna Tuna using the diversity index, uniformity index, and dominance index approaches. The results showed that the community structure of zooplankton and phytoplankton that had been identified in the gastric contents of the Tuna Tuna was in accordance with life in Lamongan waters indicated by the diversity index value belonging to the medium and low categories, the uniformity index value belonging to the high category, and the dominance index value belonging to the unstable and stable category.