PENGARUH ARTEMIA BIOENKAPSULASI DENGAN BUBUK SPIRULINA TERHADAP KINERJA PERTUMBUHAN BENIH IKAN DEPIK (Rasbora tawarensis)

The Siamese catfish (Pangasius hypophthalmus) can be cultivated with high stocking density and minimal water usage. The factor influencing fish growth is primarily water quality. The research aims to analyze the Variation of Stocking Density and Water Flow Rate for the Growth and Survival of Siamese catfish Fry (Pangasius hypophthalmus). The study was conducted in Sungai Malang Village, Amuntai Tengah District, North Hulu Sungai Regency, South Kalimantan. The experiment with two different factors can be applied to all experimental units: Factor A (Stocking Density) A1 = Stocking density 1,000 (fish/m3), A2 = Stocking density 3,000 fish/m3, Factor B (Water Flow Rate) B1 = Water flow rate 0 L/second (Control), B2 = Water flow rate 0.1 L/second, B3 = Water flow rate 0.2 L/second. Research Parameters: Absolute weight growth, Absolute length growth, Survival rate, and Condition factor. The influence of stocking density and water flow rate variations on the growth and survival of Siamese catfish fry (Pangasius hypophthalmus), focusing on stocking density (1,000 fish/m³ and 3,000 fish/m³) and water flow rate (control, 0.1 L/second, and 0.2 L/second). The research results show that the combination of stocking density of 3,000 fish/m³ and water flow rate of 0.2 L/second yields the best results in terms of absolute weight and length growth, as well as a higher survival rate. Stocking density variation significantly affects survival rates, while water flow rate does not show the same influence. Condition factors, including survival and growth, are also influenced by stocking density and water flow rate. Keywords: Siamese catfish, stocking density, water flow rate, factorial

Ulva lactuca is an algae that is a source of protein for fish and can increase resistance to disease. The purpose of this study was to determine the effect of ethanolic extracts Ulva lactuca on growth and survival rate of milkfish (Chanos chanos). This research was conducted at Brackish Water Aquaculture Development Center, Ujung Batee, Aceh, Indonesia on April-March 2019. Data were analyzed using a completely randomized design with 6 treatments and 4 replication, namely A (0 ppm), B (100 ppm), C (200 ppm), D (300 ppm), E (400 ppm), F (500 ppm). The parameters measured were absolute weight growth, absolute length growth, specific growth rate, survival rate and water quality. The ANOVA test results showed that the Ulva lactuca extract had a significant effect (P<0.05) on absolute weight growth, absolute length growth and specific growth rate but had no effect (P>0.05) on the survival rate of milkfish (Chanos chanos). The concentration of 500 ppm extract Ulva lactuca (treatment F) produced the highest on absolute weight growth (1.52 g), absolute length growth (1.96 mm), specific growth rate (0.30 %/day), and survival rate (96%).

Ornamental fish is a potential commodity because it has its own charm. One of the ornamental fish that currently has a lot of interest is Cupang fish (Betta sp.). Cupang fish at the seed stage really need good and quality feed to support success during cultivation. The purpose of this study was to analyze the effect of different natural feeds on the growth and survival of Cupang fish fry (Betta sp.) and to determine the best type of natural food for Cupang fish survival and growth. This study used a completely randomized design (RAL) with 3 treatments and 3 replications. Parameters observed were absolute weight growth, absolute length growth, specific growth rate, and survival rate. The results showed that different natural feeds had a significant effect on absolute weight growth, absolute length growth, and specific growth rates, while different natural feeds had no significant effect on Cupang seed survival. Furthermore, giving silkworms (Tubifex sp.) is the best natural food compared to water fleas (Moina sp.) and mosquito larvae (Culex sp.,) for the growth of Cupang fish seeds during maintenance.

This study aims to determine the effect of giving GDM probiotics on maintenance media on water quality and growth of pomfret fish. The method used was a completely randomized design (RAL) with 4 treatments and 3 replications, namely P0 (without the addition of probiotics). P1 (addition of probiotics 1.5 ml/L). P2 (addition of probiotic 2.0 ml/L) and P3 (addition of probiotic 2.5 ml/L). Each treatment used seeds measuring 4-5 cm. Parameters observed during the study were water quality, absolute weight growth (PBM), absolute length growth (PPM), survival rate (SR), and specific growth rate (SGR). Based on the analysis of variance, it was found that the treatment given had a significant effect (P&lt;0.05) on absolute weight growth, absolute length growth, SR survival rate, and specific growth rate. Also, based on Duncan's test, treatment P1 (1.5 ml/L) was the best treatment.

Environmental problems due to aquaculture occur along with the increase in aquaculture production. IMTA is one system used as a solution in dealing with environmental problems. The objective of this study was to analyze the growth performance, survival rate, and production of the main commodity (tilapia) and the supporting commodities (Peres, Lemeduk, and Depik) which are applied through the application of integrated multi-trophic aquaculture (IMTA) using floating net cages. This research was conducted at the Lukup Badak Fish Seed Center, Central Aceh from July to August 2020. The experimental design used was a completely randomized design (CRD) with 4 treatments and 3 replications, namely: A (tilapia), B (tilapia and peres), C (tilapia and lemeduk), and D (tilapia and depik). ANOVA test results showed that the IMTA system had a significant effect on absolute length growth, absolute weight growth, specific growth rate (SGR), survival rate, and biomass production of tilapia (P0.05). The results showed that maintenance for 42 days produced the highest value in treatment B with the increase in absolute length growth (4.26cm±0.24); absolute weight growth (5.47g±0.45), specific daily growth rate (2.28%/day±0.13) and the highest tilapia biomass production (480g/0.5m2±19.25). The highest survival rate was found in treatment C (82.42%±2.28). It was concluded that the treatment using the IMTA system was better than without the IMTA system.Keywords:IMTAWater qualityGrowth performanceTrophic interactionBiomass production

Integrated cultivation is a cultivation activity that combines several commodities that have different trophic levels, pearl oysters can be a commodity to absorb organic matter because they are filter feeders. With this system, the condition of the bay's waters is ex-fertile. So that the location can be a location for pearl oyster cultivation because it has abundant food availability for pearl oysters and this greatly affects its growth and survival. The availability of this food is influenced by the depth factor. The purpose of this study was to determine the optimal depth to produce maximum granules, both in terms of quality and quantity in Ekas Bay waters. This study used 4 treatments (1, 5, 10, and 15 m) with 4 replications, for 45 days. The parameters measured were absolute length growth, specific length growth rate, absolute weight growth, specific weight growth rate, and survival of pearl oyster spat (Pinctada maxima). The results showed that the ANOVA test results of absolute length growth, specific length growth rate, absolute weight growth, specific weight growth rate, and survival of pearl oyster spat (Pinctada maxima) showed significantly different results (P&lt;0.05). The optimal depth for growth and survival of pearl oyster spat (Pinctada maxima) in Ekas Bay waters is at a depth of 5 m (P2) with an absolute length growth of 9.05 mm, a specific length growth rate of 1.43%/day, an absolute weight growth of 0.32 g, specific weight growth rate of 6.26%, and survival rate of 76%. So it can be concluded that different depths (1, 5, 10, 15 m) have a significant effect on the growth and survival of pearl oysters (Pinctada maxima) in Ekas Bay waters.

Saline tilapia (Oreochromis niloticus) is a fish that is relatively easy to maintain in fresh or brackish water conditions. Adding cassava leaf meal and multivitamin vitaliquid to the feed can increase the high appetite of fish and accelerate the growth of saline tilapia. This research was implemented to find the effectiveness of multivitamin vitaliquid on the growth and survival rate of saline tilapia (Oreochromis niloticus). The rule used is an experiment with a Completely Randomized Design (CRD), four treatments and six replications. Data showed that the largest absolute weight growth was achieved by P4 of 4.98 ± 3.14 grams, while the smallest result was at P1 which was 2.78 ± 0.21 grams. The greatest absolute length growth was achieved at P3 resulting in a length of 2.3 ± 0.86 cm, while the smallest result was at P1 which was 1.3 ± 0.41. The highest specific growth rate was achieved at P3 11.35 ± 0.57%, while the lowest was at P2 of 9.53 ± 1.58%. The highest survival rate of saline tilapia was found in P1 at 95%, while the lowest was found in P3 and P4 which had no different results, 81.7%. The effectiveness of multivitamin vitaliquid in commercial feed given cassava leaf flour in terms of absolute weight growth, absolute length growth, specific growth rate and survival of saline tilapia fry is very effective compared to just being given pellet feed.

The larvae of the cantang grouper have low survival and slow growth. Efforts to provide good larvae are by providing sufficient nutrition in feed, one of which is by enriching rotifers (Brachionus plicatilis). Rotifera is a zooplankton that contains 40% protein and 13–16% fat. The continuous supply of phytoplankton is difficult for mass production, so the fermentation of lemuru fish can be used as a solution because it contains quite high fat and protein. The purpose of this study is to determine the effect of rotifer enrichment with fermented lemuru fish on the growth and survival of cantang grouper larvae. This study used an experimental method with Completely Randomized Design with five treatments and four replications. The research parameters measured were GR (Growth Rate), SGR (Specific Growth Rate), absolute weight growth, absolute length growth, population growth, rotifer nutrient content test and water quality. The data was analyzed using ANOVA and further tests were carried out Duncan multiple range test. The application of Rotifera enriched by fermentation of lemuru fish had a significantly different effect (p&lt;0.05) on the survival rate and larval growth of cantang grouper, as well as the increase in population and nutrient content of rotifers. The survival rate of cantang grouper larvae was 24%, the GR, SGR, absolute weight growth, and absolute length growth from this study were respectively 1.28 mg/day, 14%/day, 19.22 mg, and 1.93 mm. The growth rate of the Rotifera population increased by 31.2 ind/ml, the nutritional content of protein was 53.12%, and fat was 21.33%.The best dose concentration of enriched Rotifera with fermented lemuru fish is 800 ppm.

Milkfish culture in silvofishery pond generally depend on environment services which is naturally provided by mangrove stands within. But, optimization of silvofishery structure for the growth of Milkfish is not well improved. This research aimed to know the growth rate of Milkfish in silvofishery pond occupying different stand population and species composition of mangrove and to analyze the difference of growth rate of Milkfish based on the applied treatments. Research was conducted for 4 months including treatments of L1V1 (5 stands of Avicennia marina); L1V2 (5 stands of Rhizophora mucronata); L1V3 (5 stands ofmixed species); L2V1 (10 stands ofA. marina); L2V2 (10 stands ofR. mucronata); L2V3 (10 stands of mixed species); L3V1 (15 stands ofA. marina); L3V2 (15 stands ofR. mucronata); dan L3V3 (15 stands of mixed species). Measurements on the growth of Milkfish were conducted through field sampling involving 30 samples of Milkfish for each treatment. Observed growth parameters including absolute daily length growth, absolute daily weight growth and specific growth rate (SGR). Data collections were conducted for 3 repetitions. Data analysis were conducted with t-test and ANOVA. The research resulted there were variation on the growth rate of Milkfish including absolute daily length growth, absolute daily weight growth and SGR based on growth period nor treatments. Analysis showed there were significant difference of absolute daily length growth and SGR between growth period, but not on the absolute daily weight growth. Growth period and stand population of mangrove simultaneously effect the absolute daily length growth and SGR of Milkfish. While species composition of mangrove species did not have significant effect to the growth of Milkfish. Keywords: Milkfish, stands population, species composition, growth, silvofishery

Background: Fish feed is a key factor in the success of tilapia cultivation. Making fish feed requires various ingredients, one of which is plant-based protein. This research utilizes Lemna minor flour as the raw material for fish feed. Materials and Methods: This study employs an experimental approach to ascertain the impact of ingredients on the nutritional content of fish meal formulated in pellet feed. This study design used a Completely Randomized Design with 3 treatments and 1 control (K), namely commercial feed and 3 replications. The treatments tested were treatment K (commercial feed); treatment A 18% Lemna minor, 78% commercial feed, and 4% tapioca flour; treatment B 20% Lemna minor, 76% commercial feed, and 4% tapioca flour; and treatment C 22% Lemna minor, 74% commercial feed, and 4% tapioca flour. The feed was applied to tilapia fry. The parameters tested consisted of absolute weight growth, absolute length growth, specific growth, FCR, and water quality parameters. Data were analyzed using ANOVA. Results: The results of the study showed that the treatment had no effect on absolute weight growth, absolute length growth, specific growth, and survival rate. Meanwhile, the FCR showed that the treatment that had an effect was treatment A. Furthermore, water quality analysis showed that all water quality parameters analyzed were still in accordance with the life of tilapia. Conclusions: Using Lemna minor as a plant-based protein source can improve the growth and survival of tilapia fry. It also improves feed efficiency, particularly in terms of FCR. Feed made with Lemna minor also does not harm water quality for tilapia cultivation.

This study aimed to determine the effect of adding local microorganisms as probiotics in commercial feed to accelerate the growth of Osphronemus goramy. This research was conducted in December 2018 to February 2019 at the Marine Biology Laboratory, Faculty of Marine and Fisheries, Universitas Syiah Kuala, Banda Aceh. The method used in this study was an experimental method with Completely Randomized Design (CRD) consisting of 6 levels of treatment and 3 replications. The concentration treatment tested ware the addition of LM 0 ml 100g−1 of feed (A), 2 mL 100g−1 of feed (B), 4 mL 100g−1 of feed (C), 6 mL 100g−1 of feed (D), 8 mL 100g−1 of feed (E) and 10 mL 100g−1 of feed (F). The ANOVA test results showed that administration of LM in commercial feed at a dose of 4 mL 100g−1 had an effect on absolute length growth, absolute weight growth, specific growth rate, feed conversion ratio and survival (p<0.05), but did not affect the value feed efficiency (p>0.05). The best treatment was obtained in treatment C (addition of 4 mL 100g−1 LM of feed) namely absolute length growth (3.08 cm), absolute weight growth (0.31g), specific growth rate (2.42%), feed conversion ratio (3.22) and survival rate (74.35%). Water quality parameters in this study were within the normal tolerance range for the life of carp.

This research aim to determine the optimal dose of additional probiotic in feed toward the growth performance and survival rate of tambaqui ( Colossoma macropomum ) by using biofloc system. This research was conducted on March 30-May 9, 2018 at Technical Service Unit (UPT) of Hatchery, Marine and Fisheries Faculty, University of Riau. This research was using experimental method by completely random design (RAL) one factor with three replications. The treatments were: A: 0 g/kg of feed (control), B: 0,5 g/kg of feed, C: 1 g/kg of feed, and D: 2 g/kg of feed. The probiotic ( Bacillus sp) The results showed that a different doses of additional probiotic affecting the growth performance and the survival rate of tambaqui using biofloc system. In addition, it also affected the absolute weight growth, absolute length growth, feed efficiency and feed conversion ratio.The optimal dose was at 2 g/kg of feed as it showed significantly different results compared to control and was not differ significantly at higher doses. So that while being applied in terms of economy, 2 g/kg was the most efficient dose, by giving the absolute weight growth was 37,62 g, absolute length was 6,91 cm, specific growth rate was 7,00%, feed efficiency was 104,16%, feed conversion ratio was 0,96 and survival rate was 100%.

The target output of white snapper (Lates calcarifer) in 2019–2024 is 10,000–14,000 tons, making it a fish type with bright prospects and economic worth for human consumption. Having access to high-quality feed is a primary aspect in promoting fish growth. Fish will grow more when intake they are give them something they can eat well enough. This will allow the fish to use the energy they get from the feed, which calls for the use of probiotics as a supplement. Probiotics are additional food (supplements) derived from living microorganisms that balance the intestinal microbial flora in the digestive tract to provide benefits to the fish that consume them. The type of probiotic commonly used is EM4 (effective microorganism 4). This study aimed to examine the effects of commercial feed supplemented with EM4 probiotics on the growth, feed efficiency, feed conversion ratio, and survival of white snapper (Lates calcarifer). The fish used in the study were white snapper with a size of 8-11 cm and a seed weight of 5±3 g which were maintained for 60 days. Feeding was done by ad satiation. Five treatments and three replications were included in the fully randomized design of this investigation. The statistics that were noted included survival, absolute weight growth, absolute length growth, feed conversion ratio (FCR), feed efficiency (EPP), and amount of feed consumed. The effects of the EM4 probiotic dose on absolute weight and length growth were demonstrated by the results. feed efficiency, and FCR in white snapper (Lates calcarifer) gave a significantly different effect, while the amount of feed consumption and survival gave an effect that was not significantly different.

One of the obstacles faced in the cultivation of freshwater crayfish , especially in enlargement is the right feeding rate that can improve growth performance. This study aims to evaluate the growth performance of freshwater crayfish with different feeding rates. This research was conducted in Cicareuh Village, Cikidang District, Sukabumi Regency. with 3 treatments, namely feeding rate 1%, 2.5%, and 4% for 40 days. Parameters observed in this study were specific growth rate, absolute weight growth rate, absolute length growth, absolute weight growth, feed efficiency, survival and water quality. This study was analyzed by ANOVA and Tukey's further test. In general, different feeding rates have a significant effect on growth performance and FR 4% is the best feeding rate in this study.

Polyculture is a sustainable aquaculture system because it can reduce environmental pollution and increase feeding efficiency. The purpose of this study was to analyze the performance of growth, biomass and food competition for tilapia as the main commodity and lemeduk fish as a secondary commodity with a polyculture system in floating net cages. The research method used a Completely Randomized Design (CRD) consisting of 5 treatments and 3 replications, namely: treatment A (60 tilapia fish), Treatment B (40 tilapia fish + 20 lemeduk fish), Treatment C (30 tilapia fish + 30 lemeduk fish), Treatment D (20 tilapia fish + 40 lemeduk fish), and Treatment E (60 lemeduk fish). The research container uses floating net cages with a size of 0.5 × 0.5 × 1m. Parameters observed were absolute length growth, absolute weight growth, specific growth rate, biomass production, competition index, and water quality. The results showed that the polyculture system of tilapia and lemeduk at different stocking densities had a significant effect on absolute length growth, specific growth rate, biomass production, and had low competition between tilapia and lemeduk. The best treatment was found in treatment B (N 40+ L 20) and treatment C (N 30+ L 30) with absolute length growth value 3.20 cm±0.17, specific growth rate 3.83%±0.36, biomass of tilapia 94.36 g/0.5m2±16.45 and total biomass 100.69 g/0.5m2±5.49. Hence, the polyculture system is better than the monoculture system and the absence of competition between tilapia and lemeduk in using food.