ABSTRAKTujuan penelitian adalah untuk menganalisis parameter fisika-kimia yang meliputi suhu, kecerahan, pH, oksigen terlarut, nitrat, fosfat, amoniak dan BOD pada lokasi budidaya karamba jaring apung dan jaring tancap di Kelurahan Paleloan, Kecamatan Tondano Selatan Kabupaten Minahasa serta menentukan lokasi budidaya yang cocok untuk menunjang pertumbuhan yang optimal. Pengukuran parameter kualitas air dilakukan pada tiga titik pengamatan secara in situ untuk temperatur, kecerahan dan pH dan analisis laboratorium untuk oksigen terlarut, fosfat, amoniak, nitrat dan BOD. Hasil penelitian menunjukkan temperatur pada ke tiga titik pengamatan berkisar 25,5 -28,2 0 C, Kecerahan 2,02 -3, 15 m, pH 6,8 -8,2, oksigen terlarut 7,41 -7,77 mg/L, Nitrat 0,3 -0,5 mg/L, Fosfat 0,00 -0,4 mg/L, Amoniak 0,13 -0,77 mg/L, BOD 0 -0,474 mg/L. Dengan mengacu pada standar baku mutu kualitas air menurut PP No. 82 Tahun 2001 maka dapat disimpulkan bahwa parameter kualitas air pada lokasi budidaya ikan di Kelurahan Paleloan, untuk parameter suhu, kecerahan, pH, oksigen terlarut dan nitrat masih berada dalam kondisi baik sedangkan parameter amoniak pada titik pengamatan I, II dan III, fosfat pada titik pengamatan I pada kedalaman 0,5 m dari permukaan air dan BOD pada titik pengamatan III pada kedalaman 0,5 m dari dasar danau terindikasi melewati batas baku mutu kualitas air. ABSTRACTThe purpose of this research was to analyze the physical and chemical parameters of waters (temperature, turbidity, pH, dissolved oxygen, nitrate, phosphate, ammonia and BOD) around net cage culture area at Peleloan Village, Minahasa Regency and to determine the suitable culture site supporting optimal growth of fish. water quality was measured at three sites. Temperature, turbidity, and pH were measured in situ while dissolved oxygen, nitrate, phosphate, ammonia and BOD were analised in laboratorium. Research results showed water temperature at all observation sites ranged from 25.5-28.2 0 C, turbidity 2.02-3.15 m, pH 6.8 -8.2, DO 7.41-7.77 mg/L, nitrate 0.3-0.5 mg/L, phosphate 0.00-0.4 mg/L, ammonia 0.13-0.77 mg/L. Based on water quality standard criteria stated in PP No. 82, 2001, temperature, turbidity, pH, DO and nitrate at fish culture area were suitable for floating and stick net cage cultures but ammonia at all sites of observation, phosphate at site I at 0.5 m from the bottom and BOD at site III at 0.5 m from the bottom were exceeding the standard criteria.

This study aimed to analyze the chemical composition of the Pinctada margaritifera shells in North Sulawesi. Shells were collected from 3 (three) locations, namely: the coast of Arakan Minahasa Selatan waters, Bahoi Minahasa Utara waters and Talengen waters of Sangihe Islands, North Sulawesi. Three samples of shell powder each containing 100 grams, packed in a plastic bag to be analyzed using the ICP-OAS type Thermo scientific iCAP 6000 Series at the Wln (Water Laboratory Nusantara) Laboratory in Manado. The shell of P. margaritifera had macro mineral composition, namely calcium, phosphorus, magnesium, sodium and micro minerals, namely manganese and iron.Keywords: Shells, Pinctada margaritifera, Mineral

The purpose of this study was to determine the best culture medium for producing maggot (Hermetia illucens) and to determine the production quantity in each different medium.  This research was controlled two times a day at 09:00 a.m. and 16:00 p.m. Cultivation media were prepared from coconut pulp, tofu pulp, rice bran and restaurant wastes. Each medium was weighed as much as one kg and then placed into a culture container. The research used Completely Randomized Design consisting of 4 treatments, each with three replications. The parameters observed consisted of temperature and pH of the media  measured at 07.00 am and 17.00 pm, and maggot production measured on the last day. During the ten days of experiment, the production of maggot in the treatment using restaurant waste media was significantly different as compared to other treatments. This study found that a good medium for the production of maggot was prepared using restaurant waste. Keywords: Hermetia illucens, coconut pulp, restaurant waste

This study aimed to determine the effect of several different types of feed on absolute length growth, relative length growth, and survival rates are gouramy larvae (Osphronemus gouramy). This study used four treatments, with three replications. The treatments tested were four different types of feed on the larvae of gouramy, among others; feed worms Tubifex sp., Artemia sp.,boiled chicken egg yolk and finely pelleted feed FF-999. The experimental design used was completely randomized design.      The results showed that different types of feed provided a significant influence on the absolute length growth, relative length growth and survival of larval gouramy (Osphronemus gouramy). Feed worms Tubifex sp. give the best results with an absolute value growth of 1.34 cm length, relative length of 148.87% growth, and survival of 34%. Feed worms Tubifex sp. is the best feed in promoting growth and improving survival of larval gouramy (Osphronemus gouramy).   Keywords : Larvae,  gourami, Tubifex, Artemia, feed

This study aimed to determine the best combination of feed on the growth and survival of larval fish catfish (Clarias gariepinus). This study  used completely randomized with six treatments including treatment A: Artemia, B: Tubifex C: Pellet, D:  combination of (50%) Artemia + (50%) Tubifex, E:  combination of (50%) Artemia + (50%) Pellet, and      F:  combination of (50%) Tubifex + (50%) Pellet. Each treatment consisted of three replications. The result showed that the combination of  50% artemia + 50% tubifex could promote the growth length of larvae of 4,003 cm, weight of larval of 0.633 g,  and larval survival was 79%.  This combination was the best combination for the growth and survival of catfish larvae.   Keywords: Combination of feed, Clarias gariepinus, larvae, growth, survival