Abstract. Andayani S, Dadiono MS, Elwira WT, Setyawan FH. 2020. Potency of aloe extract as immunostimulant for carp (Cyprinus carpio) against Aeromonas salmonicida. Biodiversitas 21: 860-864. The objective of the study was to be able to know the cellular and humoral non-specific immune response to Aeromonas salmonicida after aloe extract administration. This study employed Complete Randomized Design with 3 treatments and 3 replications, control treatment (K), A =2 ppm of aloe extract application in the media, B = 16 ppm of aloe extract in the media, and C = 30 ppm of aloe extract in the media. The extract was given through one-hour soaking at day 0 and day 7, and then challenge-tested to 107 cells.ml-1 of A. salmonicida into the media for one day. Results showed that administration of aloe extract could raise plasma protein levels from 443.0 to 662.0 mg.Kg-1 antibody from 1.2576 to 3.3974, and phagocytic activity from 30.61% to 45.94%. Similarly, the differential value of leucocyte (lymphocyte from 58.6% to 73.70%, neutrophils from 6.09 to 8%, and monocyte from 5.70% to 7.72%). As conclusion, aloe extract at the dose of 2 ppm could raise the cellular and humoral non-specific immune. Therefore, the use of aloe extract as immunostimulant at the dose of 2 ppm applied through immersion could also apply other methods, such as oral and injection.

Pembenihan kerapu macan (Epinephelus fuscogutattus) skala rumah tangga merupakan salah satu penyumbang peningkatan produksi benih kerapu nasional. dengan adanya pembenihan kerapu skala rumah tangga permintaan akan benih kerapu bisa terpenuhi serta meningkatkan perekonomian masyarakat. Studi ini bertujuan untuk mengetahui pembenihan kerapu macan skala rumah tangga yang meliputi penyediaan pakan, penetasan telur, pengelolaan kualitas air, pemanenan, Hatching Rate (HR) dan Survival Rate (SR). Metode pengambilan data dengan cara wawancara, observasi dan partisipasi aktif. Hasil observasi terkait pembenihan dimulai dengan penyediaan pakan alami hingga proses pemanenan benih berukuran 2,7-3 cm. Hatching Rate (HR) mencapai 80% dan Survival Rate (SR) mencapai 20%. Benih yang dihasilkan sebanyak 120.000 ekor/siklus. Hasil panen benih sebanyak 24.000 ekor/siklus.

Avicennia marina have been known for a long time by the community because of the many benefits they have and are commonly used as medicines, fuelwood or construction of house buildings, and also animal feed. Production of tilapia srikandi is currently being developed to increase fisheries production cultivation, tilapia srikandi (Oreochromis aureus x niloticus) has many advantages including fast to growth, disease resistance and tolerance to the environment. The purpose of this study was to determine the effect of artificial feed with the the addition of formulation from different Avicennia marina leaves to the growth of srikandi tilapia (Oreochromis aureus x niloticus). This study was conducted using a completely randomized design (CRD), with 3 treatments 3 replications and using 10 fish in each replication treatment. Treatment of A: 100% artificial feed, Treatment B: 25% artificial feed + 75% flour of Avicennia marina leaves, Treatment C: 50% artificial feed + 50% flour of Avicennia marina leaves, Treatment D: 75% artificial feed + 25% flour of Avicennia marina leaves. The results of this study indicate that the treatment of the effect of the combination of artificial feed with flour of Avicennia marina leaves on the growth of srikandi tilapia (Oreochromis aureus x niloticus). The variable of daily growth rate and survival variable get the best results in treatment C (50% artificial feed + 50% flour of Avicennia marina  leaves), in the long variable absolute get the best results on treatment D (75% artificial feed + 25% flour of Avicennia marina leaves ), variable of absolute weight and FCR variable get the best results in treatment A (100% artificial feed).

Ikan mas koki merupakan salah satu jenis ikan hiasair tawar. Ikan mas koki ini sangat potensial untukdikembangkan. Hal ini dikarenakan peluang bisnis ikankoki ini sangat terbuka lebar baik bisnis dalam negerimaupun luar negeri. Ikan mas koki memiliki nilaiekonomis tinggi. Budidaya ikan mas koki ini tidakmembutuhkan lahan yang terlalu luas. Siklusreproduksinya cukup singkat namun harga jualnya cukuptinggi. buku ini menjelaskan cara mudah dan cepat dalam memijahkan ikan koki

The existence of freshwater crayfish in Indonesia is not well known among the community, even some people think that this type of lobster can only be obtained from catches. Freshwater lobster cultivators are always faced with the classic problem of low survival, especially during seed stages. The role of the water bottom substrate for freshwater crayfish is to support stabilizing water quality (temperature, pH, dissolved oxygen and ammonia levels). If the substrate condition of the habitat is not suitable, it can inhibit growth and even death. The purpose of this study is; to find out the effect of different basic substrates can increase the survival and growth of freshwater lobsters. The research method used a Completely Randomized Design (CRD) with 4 treatments 3 replications and 1 control. Each container is stocked with 2-inch lobster seeds with a density of 10 heads / container. The substrate application for each treatment is: A = Control, B = Land, C = Sand Malang, and D = Gravel. Based on the results of the research that has been done, it can be concluded that the administration of different substrates only shows significant differences in the survival variable, with the highest number of 96,67% in treatment C (Malang sand) and the lowest with 66,00% in treatment A (Control). While the variables of absolute weight, absolute length, and daily growth rate did not show significant differences in all treatments.