Availability of quality and effective tiger barb seeds is highly limited and leads to unfulfilled market demand. This study was conducted from April - May 2018 in the Laboratory of Aquaculture, Faculty of Agriculture, University of Asahan. Result of analysis of variance (ANOVA) shows that Fstatistic≫Ftable (636,097≫0,17), thus H0 is rejected and H1 is accepted, hence treatment of different substrates significantly affected egg number of tiger barb. Similarly, the value of fecundity, hatching rate, and survival rate obtained in this study resulted in Fstatistic≫Ftable (353.676≫0,17) or H0 is rejected and H1 is accepted, hence significant effect on hatching rate was obtained due to substrate treatment and Fstatistic≫Ftable (38,741≫0,17) H0 is rejected and H1 is accepted which reflected significant influence on tiger barb survival by reason of different substrate treatment. Hatching Rate is obtained by calculating the number of eggs hatched by tiger barbs (Puntiustetrazona). The highest hatching rate of tiger barb in this study was observed in treatment of Hydrillasp (88,14%) followed by palm fiber (72,89%) and water hyacinth (72,75%), while the lowest percentage was obtained by treatment of twigs and raffia rope.

Kecerahan warna tubuh ikan mas koki akan meningkatkan nilai jualnya namun kualitas warna tubuh dapat menurun apabila kandungan pigmen warna berkurang seiring lamanya masa pemeliharaan. Rekayasa nutrisi dengan menambahkan sumber karatenoid yang berasal dari tumbuhan dapat mempertahankan kualitas warna ikan hias. Penelitian bertujuan untuk mengevaluasi efektivitas pemberian tepung ubi jalar ungu yang ditambahkan kedalam pakan buatan terhadap kecerahan warna, pertumbuhan dan kelulushidupan ikan mas koki. Ikan uji adalah ikan mas koki orlada berat 2-3 gram dengan padat tebar 10 ekor per wadah. Perlakuan berupa perbedaan persentase tepung ubi jalar kedalam pakan buatan yaitu P0 (Kontrol); P1 (2,5 % tepung ubi jalar ungu); P2 (5 %); P3 (7,5 %) dan P4 (10 %). Penambahan 10% tepung ubi jalar memperlihatkan peningkatan warna terbaik dari semua perlakukan dengan nilai/skor rata-rata 4. Namun tidak berpengaruh terhadap pertumbuhan panjang dan berat mutlak serta kelangsungan hidup ikan mas koki.

The purpose of this study was to determine the type and level of prevalence and intensity of ectoparasites that infect mud crabs (Scylla serrata) in Asahan district. The method of data collection was carried out by field observation methods carried out in the sea silos, Pematang Baru, and Sei Kepayang areas. The crab samples observed were live crabs, the number of mud crabs taken for the sample was 10% of each population. Furthermore, in the carapace, the type of parasite that attacks is Trichodina sp with a prevalence rate of 38%. This parasite infected 5 of the 13 samples. Then the types of parasites Carchesium sp and Poecilasmatidae each with a prevalence rate of 31% these two types of parasites infect 4 samples of crabs found at the foot of theroad, this type of parasite infects 4 out of 13 samples. Then the types of parasites Carchesium sp and Poecilasmatidae each with a prevalence rate of 31% these two types of parasites infect 4 samples of crabs found at the foot of theroad, this type of parasite infects 4 out of 13 samples. Then the types of parasites Carchesium sp and Poecilasmatidae sp each with a prevalence rate of 31% these two types of parasites infect 4 samples of crabs found at the foot of theroad, this type of parasite infects 4 out of 13 samples. The crabs that attack the sea silos are Octolasmis sp, Ichtyopthyrius multifilis, Trichodina sp, Zoothamnium sp. The parasites that attack the new ponds are Octolasmis sp, Carchesium sp, Zoothamnium sp, and the parasites that attack Sei Kepayang are Octolasmis sp, Carchesium sp, Poecilasmatidae sp, Trichodina sp. The intensity of the parasites found was classified as moderate but for the parasite Octolasmis sp.

The problem with UPR Dian Farm is that water fleas are not available independently, causing a low survival rate of gouramy seeds (30–40%). Cow dung contains nutrients N and P, which can promote the growth of phytoplankton and bacteria, both of which serve as food sources for water fleas. Cow dung waste around the target partner location has not been optimally utilized as a medium for growing water fleas. The purpose of the service activity is to ensure that the target partners are able to produce water fleas independently, increasing the growth and survival of the carp seeds that are kept. The service method is in the form of lectures and discussions, as well as training. The results of service activities are able to increase the knowledge and skills of the target partners. The results of the test on cow dung that was fermented for 7 days showed the elemental content of C-organic = 13.31%, total N = 0.46%, P = 0.77%, and K = 0.30%. The results of the proximate analysis of water fleas obtained a protein content of 4.90%, fat of 42.10%, fiber of 4.85%, water of 96.64%, and ash of 2.22%. Water fleas given to gouramy seeds increased the absolute length of the seeds by 3.6 cm, with a relative growth rate of 0.12%/day. The absolute weight growth of gouramy seeds was 1.38 grams, with a relative weight growth rate of 0.046 %/day. The survival rate of gouramy seeds increased by up to 77%.

Penelitian ini bertujuan untuk mengetahui aspek ekologi, biologi dan peluang akuakultur pada udang galah dan mengetahui laju pertumbuhan harian udang galah, pertumbuhan mutlak dan relatif dari pakan alami maupun buatan yang diberikan serta kelangsungan hidup udang galah. Metode penelitian adalah Rancangan Acak Lengkap (RAL) dengan perlakuan pakan (Po : cacing tubifex, P1 : keong, P2 : pellet) dan media (M1 : terang dan M2 : gelap). Parameter yang diukur yaitu laju pertumbuhan harian, pertumbuhan mutlak dan relatif, kelangsungan hidup udang galah serta kualitas air pada wadah pemeliharaan. Udang galah yang diberi pakan Tubifex memperlihatkan laju pertumbuhan harian (9,03%); pertumbuhan berat mutlak (5,69 gram) dan relatif (0,46); pertumbuhan panjang mutlak (1,56 cm) dan relatif (0,14) serta kelangsungan hidup (83,9) tertinggi dibandingkan dengan udang galah yang diberi pakan Keong dan Pellet. Hasil pengukuran kualitas air memperlihatkan bahwa suhu air antara 27 – 28 0 C, pH 7,7 – 8 dan kandungan oksigen terlarut (DO) 2,9 sampai 5,3 masih mendukung pertumbuhan dan perkembangan udang galah