Feed is an important factor in the culture of vannamei shrimp. The optimum feed have clone to prevent underfeeding or overfeeding, whereas the amount of feed must have adjust with shrimp biomass. The aim this research is to know the percentage of optimum feed from vannamei shrimp. The method is experimental research with Complete Random Design, and the result showed that difference of percentage of feed is not significantly for daily growth of vannamei shrimp. The amount of feed as mush as 40 % of biomass weight/day showed the best daily growth (9.86 %).

Tujuan penelitian ini adalah mengetahui pengaruh substitusi tepung rumput laut dalam pakan ikan terhadap laju pertumbuhan pada ikan nila merah (Oreochromis sp.) Substitusi tepung rumput laut yang digunakan yaitu jenis (Gracilaria sp.) yang di dapat dari pembudidaya rumput laut jenis (Gracilaria sp.), ikan uji yang digunakan yaitu ikan nila merah (Oreochromis sp.) ukuran 7-10 cm, yang di analisia laju pertumbuhan spesifik dan dan laju pertumbuhan mutlak. Metode yang digunakan adalah metode eksperimental. dengan rancangan acak lengkap (RAL), dengan 4 perlakuan dan 4 ulangan, perlakuan dalam penelitian ini menggunakan komposisi yang berbeda yaitu : yaitu A (Pakan Komersial), B (Pakan Komersial 90% + Tepung Rumput Laut 10%), C (Pakan Komersial 80% + Tepung Rumput Laut 20%), D (Pakan Komersial 70% +Tepung Rumput Laut 30%). Data laju pertumbuhan spesifik, dan laju pertumbuhan mutlak dianalisis menggunakan analisa sidik ragam dengan taraf kepercayaan 95%. Hasil penelitian menunjukkan bahwa perlakuan substitusi pakan komersial dengan tepung rumput laut memberikan hasil perlakuan substitusi pakan komersial dengan tepung rumput laut (Gracilaria sp.) terhadap laju pertumbuhan spesifik dan laju pertumbuhan mutlak ikan nila merah tidak memberikan pengaruh nyata karena pengaruh tekstur pakan yang berbeda membuat laju pertumbuhan ikan nila merah tidak berbeda nyata.

ABSTRAKPenelitian ini bertujuan untuk mengetahui pengaruh fermentasi tepung limbah rumput laut (Gracilaria sp) dengan menggunakan konsorsium bakteri dari saluran pencernaan ikan bandeng (Chanos chanos) sebagai pakan ikan dan pengaruhnya terhadap FCR, SR, SGR dan GR pada ikan uji. Metode yang digunakan dalam penelitian ini adalah penelitian eksperimen laboratoris, dengan teknik pengambilan data melalui observasi langsung dengan menggunakan Rancangan Acak Lengkap (RAL) karena selain unit perlakuan maka semua faktor dibuat homogen atau dihomogenkan. Penelitian ini menggunakan 6 perlakuan, 4 ulangan sehingga terdapat 24 satuan percobaan. Perbandingan untuk pakan 1000 gr adalah dengan menggunakan konsorsium bakteri sebanyak 10 : 70 gram dimana 10 gram merupakan konsorsium bakteri dan 70 gram tepung limbah rumput laut. Tidak ada pengaruh pemberian pakan tepung limbah rumput laut terfermentasi konsorsium bakteri dari saluran pencernaan ikan bandeng (Chanos chanos) pada SGR (spesifik grow rate) ikan bandeng. Hasil dari pemeliharaan selama 30 hari tidak menunjukkan pengaruh yang berbeda nyata terhadap pertumbuhan mutlak pada ikan bandeng. Pada pakan yang ditambah tepung limbah rumput laut yang terfermantasi dengan konsorsium bakteri saluran pencernaan pada ikan bandeng terdapat bakteri yang belum spesifik. Bakteri yang ada di saluran pencernaan ikan bandeng diduga menghambat metabolisme pada ikan dan ada yang membantu proses metabolisme pada ikan. Kata kunci: Fermentasi limbah, Gracillaria Sp, Bakteri Chanos chano, RAL. AbstrackThis study aimed at determining the effect of seaweed flour fermentation (Gracilaria sp) by using a consortium of bacteria from the digestive system of milkfish (Chanos chanos) as its feeds and its effect on FCR, SR, SGR and GR in tested fish. The method used in this study was a laboratory experimental research, with data collection technique was through direct observation using a Completely Randomized Design (CRD) because in addition to the treatment units, all factors were made homogeneous or being homogenized. This study used 6 treatments, 4 replications so that there were 24 experimental units. The ratio for 1000 gr of feed used a bacterial consortium of 10:70 grams in which 10 grams were a bacterial consortium and 70 grams were seaweed waste flour. There was no effect of giving feeds made of seaweed waste fermented by a bacterial consortium from the digestive system of milkfish (Chanos chanos) on the SGR (specific growth rate) of milkfish. The results of 30 days of rearing did not show a significantly different effect on absolute growth in milkfish. In the feed added with seaweed waste flour fermented with a consortium of digestive system bacteria in milkfish, there were bacteria that are not yet specific. The bacteria in the digestive tract of milkfish were assumed to inhibit the fish metabolism and some helpedin fish metabolism processes.Keywords: Waste fermentation, Gracillaria Sp, Chanos chanos bacteria, CRD

Highlight ResearchThe mortality of lobster seeds by predators in the first year is 96.0-99.4%It takes technology to catch seeds before being eaten by predatorsApplication of sound wave-based attractor technology to lobstersDo lobsters have the ability to hear sound waves?The lobster's sense of hearing begins to function from the puerulus stage AbstractIndonesia is a country that produces abundant lobster seeds (puerulus), however, there is a paradox, where natural mortality in the first year since entering the settlement phase can reach 96.0-99.4%. The use of lobster resources, especially in the puerulus stage, for cultivation, is very strategic. Therefore, it is necessary to improve puerulus fishing technology. In the capture fisheries sector, the use of the sense of hearing in fish resources has been carried out to increase catch productivity, by utilizing sound wave-based attractors’ technology. For lobster resources, to what extent is this technology applicable? Underwater sound waves are a phenomenon of compression and expansion of a medium as sound energy passes through it. This aspect of the study is still new and very prospective. The purpose of this review article is to answer some basic questions: Can lobsters be able to hear sounds that come from their surroundings, since when do lobsters sense of hearing begin to function, and anatomically what kind of auditory organs are in lobsters. The results of the review conclude as follows: lobsters have senses that are able to perceive or listen to sound waves (sound) from their surrounding environment, this ability has been possessed by lobsters since they were in the postlarva or puerulus stage. Anatomically, the organs that act as the sense of hearing in lobsters are: receptors on the body surface, chordotonal organs and statocyst organs.