Asian Journal of Fisheries and Aquatic Research
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Dietary Supplementation of Chromium Picolinate does not affect Growth Performance and Feed Conversion Ratio of Rainbow Trout (Oncorhynchus mykiss)
No full textAims: A growth experiment was conducted to explore the impact of dietary chromium on the growth performance and feed conversion ratio of rainbow trout (Oncorhynchus mykiss).
Study Design: Original Research Article
Place and Duration of Study: Fisheries Research Station (FRS), Trishuli Nepal, between November 1 to January 29, 2023.
Methodology: A total of 270 healthy and equal sized- O. mykiss (initial weight: 27g) were fed on a non-supplemented basal diet (Cr-Pic0), or a basal diet supplemented with 0.4g/kg Cr-Pic (Cr-Pic0.4), or a basal diet supplemented with 1.2g/kg Cr-Pic (Cr-Pic1.2) for 90 days. Each diet was randomly assigned to three replicate groups of 30 fish per flowthrough raceway tanks for 90 days and fed to apparent satiation twice daily.
Results: Upon conclusion of the feeding trial, the results showed no significant differences in final weight, weight gain, specific growth rate, or condition factor among treatments (P>0.05). There were also no significant differences in the survival rate and feed conversion ratio of the rainbow trout fed various experimental diets (P>0.05).
Conclusion: The results suggest that growth performance, food conversion, and survival of rainbow trout fingerlings are not affected by 0.4 or 1.2 mg/kg supplementation of Cr-Pic in diet
Determinants of Production and Technical Efficiency of Tilapia Farming in the Philippines
No full textThe Philippines\u27 economy depends heavily on the profitability of the tilapia aquaculture industry. The country\u27s tilapia aquaculture still has a significant amount of untapped biophysical growth potential; therefore, more rapid expansion is needed to keep up with the increasing demand for fish. The study examined the variables affecting the technical efficiency of tilapia production in the Philippines. The face-to-face interview method was used to survey randomly selected tilapia farms. The efficiency of the Philippines\u27 tilapia aquaculture was estimated in this study. Overall, the findings of the technical efficiency analysis indicated that all fish producers within the examined regions were functioning below the production frontier. Therefore, to boost productivity and efficiency, it is necessary to thoroughly study the origins of inefficiencies in socioeconomic variables and farm features. The mean technical efficiency, as determined by the maximum likelihood estimation of the stochastic production frontier, is 0.44. The model\u27s outcome showed that area and stocking rate significantly impact tilapia output in a few selected Philippine locales. It was discovered that factors such as the utilization of aeration, adoption of advanced culture method, and access to government support are significant predictors of technical efficiency in tilapia farming. The policy implication is that there are still more opportunities to raise the current level of technical efficiency of tilapia production in the Philippines
The Impact of Silica Addition on Floc Volume Density in the Biofloc System for Juvenile Red Tilapia (Oreochromis niloticus)
No full textBiofloc technology is a solution to the problem of waste management in aquaculture. Biofloc systems are beneficial because they not only reduce inorganic nitrogen waste from feed residues and fish excrement but also produce flocs. The aim of this research is to determine the effect of silica addition on floc volume density in the biofloc system for juvenile red tilapia. The research was conducted from January to March 2024 at the Center of Excellence in Science and Technology (PUI-PT) for Functional Nano Powder at Padjadjaran University. This study uses a Completely Randomized Design (CRD) experimental method with four treatments and three replications. The treatments used were (A) control, (B) 15 ppm silica, (C) 20 ppm silica, and (D) 25 ppm silica. The study used cylindrical containers with a capacity of 19 liters filled with 15 liters of water, a stocking density of 10 juvenile red tilapia per cylinder, with the juvenile measuring 3-4 cm and weighing 3-4 g. The parameters observed were floc volume density and water quality. The data on floc volume density and water quality were analyzed descriptively. The results showed that the addition of 25 ppm silica in the biofloc system was the best treatment for floc volume density. This was evidenced by the results in treatment D (25 ppm) achieving a floc volume density of 26.5 ml/L, which falls into the dense category. Therefore, the addition of silica concentration in the biofloc system can increase floc volume density
Effect of Solid-State Fermentation on Phytochemical Composition of Rice Bran Meal
No full textIn aquaculture, the available feed ingredients are expensive and limited in quantity making it essential to explore fish feed ingredients that are low-cost and locally available. Agro by-products seems to be one of the available source. This study evaluate the effect of solid state fermentation on phytochemical compositions of rice bran meal. Rice bran was collected in three different containers, ground into powder, then sieved and fermented using solid state fermentation procedure. Each sample was solidly fermented (wet at 10% moisture and keep in fermenter at ambient temperature) for 24 hours (1 day), 96 hours (4 days), and 168 hours (7 days). Afterward, the fermented samples were oven dried for one hour at 100oC as described. The fermented samples were taken to the laboratory for phytochemical analysis. The results obtained from this study revealed that fermenting rice bran for seven days (168hrs) using solid state fermentation method reduced the Alkaloid contain from 12.61±1.04 mg/kg to 10.24±1.52 mg/kg, 9.18±0.11 mg/kg and 8.13±0.16 mg/kg. Phytate from 6.73±1.32mg/kg to 4.39±0.82mg/kg, 4.05±0.56mg/kg and 2.15±0.73mg/kg. Tannins from 4.60±0.13 mgTA/kg to 4.11±0.65 mgTA/kg, 3.26±0.47 mgTA/kg and 1.52±0.24 mgTA/kg. Saponins from 2.98±0.54 g/kg to 2.50±0.17 g/kg, 1.88±1.54 g/kg and 1.43±1.17 g/kg. Oxalate from 2.78±1.25 mg∞/100g to 2.47±1.42 mg∞/100g, 2.91±0.31 mg∞/100g and 1.82±0.13 mg∞/100g. However, it increases Flavonoids from 6.94±1.82 mgRutin/kg to 7.90±1.35 mgRutin/kg, 9.03±0.43 mgRutin/kg and 11.18±1.35 mgRutin/kg. Phenols from 1.71±0.32 gGAE/kg to 2.14±0.12 gGAE/kg, 2.91±1.53 gGAE/kg and 3.58±1.65 gGAE/kg. This study establishes the fact that, fermented rice bran meal can be incorporated as an essential part of the feed production in order to reduced cost of production thereby increasing the profit and enhances waste management
Rh-Chamber: A Novel Chamber Design for Gas Sampling in the Coastal Sediment and Water Surface
No full textThis research aims to develop and test Rh-Chamber, an innovative gas sampling tool designed for coastal environments. The coastal environment is a dynamic ecosystem that plays an important role in the global biogeochemical cycle, especially in the production and release of greenhouse gases such as carbon dioxide (CO2), methane (CH4), and nitrous oxide (N2O). Until now, existing gas sampling methods have limitations, especially in maintaining representative field conditions and capturing temporal dynamics of gas release. The Rh-Chamber comes as a highly flexible solution, allowing sampling both on coastal sediments and on the water surface. The design consists of a gas incubator, a float and a ballast, which allows the appliance to function optimally in various current and sediment conditions. Gas sampling is done manually using syiringe, with varying time intervals. The results show that Rh-Chamber provides better accuracy in measuring gas flux in coastal ecosystems than conventional methods. These innovations also have the potential to be used in climate change research, especially to evaluate the contribution of coastal ecosystems to greenhouse gas emissions. Although there are some limitations, such as the need for additional manpower in its operation in deeper waters, the Rh-Chamber makes a significant contribution to coastal environmental research
Impact of Different Small Fish Feeds on the Growth and Survival of Mangrove Crabs (Scylla serrata)
No full textMangrove crab (Scylla serrata) is a type of crustacean that lives in mangrove forests and estuaries, a member of the portunidae tribe. Mangrove crabs have considerable economic potential at home or abroad and the demand is also quite high. Its availability can only be obtained by continuous capture in the wild, so people are worried about its population. One way to overcome this is by maintaining mangrove crab fattening apartment system. Determination of feed dosage is one of the cultivation processes that needs to be understood because it affects the growth rate, survival and production levels of mud crabs. Therefore, it is necessary to conduct research on the effect of feeding different doses of raw fish on the fattening and survival of mud crabs (Scylla serrata). The purpose of this study was to analyze the optimal feed weight and frequency of feeding on fattening and survival of mud crabs in the crab box. The method used in this research is experimental method with complete randomized design. This treatment was carried out with 4 treatments and 3 replications, namely P1: 4%, P2: 8%, P3: 12% and P4: 16%. The four treatments were repeated 3 times so that 12 experimental units were obtained. the value of water quality parameters obtained during the study is still considered optimal. The results of the research conducted can be concluded that the provision of different doses of raw fish feed in fattening mud crabs is significantly different from the results of absolute weight and Specific Growth Rate (SGR) but not significantly different from the results of Survival Rate (SR) and Feed Conversion Ratio (FCR). The best treatment is p3 with a dose of 16%. The conclusion of this study can be concluded that the provision of different doses of feed affects the absolute weight and specific weight growth rate (SGR) of mangrove crabs (Scylla serrata). The water quality obtained is still optimal for mangrove crab cultivation
Evaluation of the Digestibility of Diets Containing Soy Okara in Clarias gariepinus (Burchell, 1822) Fries Raised in a Controlled Environment in Benin
No full textAims: To evaluate the digestibility of diets containing soy okara in Clarias gariepinus fries.
Study Design: Random complete block design.
Place and Duration of Study: Laboratory of Hydrology and Wetland Research, Faculty of Sciences and technics, University of Abomey-calavi, between June 2019 and July 2019.
Methodology: Four diets containing different levels of soy okara (0%, 10%, 20% and 30%) respectively noted T0, T1, T2 and T3 were tested. Twelve 40L tanks were randomly distributed into 04 batches with 03 repetitions for each of the 04 diets. The fries with an initial average weight of 10.47 +/- 2g were fed ad libitum three times a day (8 A.M., 12 P.M., 4 P.M.) for 30 days. Survival rate, cannibalism rate, average daily gain, specific growth rate, weight-length relationship, condition factor, consumption index, ingested protein, protein efficiency coefficient and digestive utilization coefficients were measured.
Results: The specific growth rates (SGR) ranged between 2.25 +/- 0.165 and 2.58 +/- 0.115 with the best rate for the treatment containing 0% soy okara. The consumption index varied from 1.18 +/- 0.009 to 1.41 +/- 0.132 with the best index for the T3 treatment. Furthermore, the mortality rates were 0% for treatments containing 20% and 30% soy okara. The results indicate that it is possible to incorporate up to 30% soybean okara into the diet of Clarias gariepinus fry without hindering their zootechnical performance. The digestive protein utilization coefficients of the diets were calculated and are 95.12; 88.47; 92.21 and 90.37 for diets containing 0%, 10%, 20% and 30% soy okara respectively.
Conclusion: The results demonstrate that among the different diets tested, treatment T2, containing 20% soy okara, proved to be the most favorable in terms of zootechnical performance. These results suggest that T2 treatment can be considered as a promising option for feeding Clarias gariepinus fries
Otolith Shape Indices of Japanese Threadfin Bream (Nemipterus japonicus, Bloch 1791) from the Makassar Strait, Indonesia
No full textJapanese threadfin bream (Nemipterus japonicus) is a demersal fish that plays a very important role in maintaining ecosystem stability related to webs and food chains. This fish often becomes prey for predatory fish. In efforts to reveal the relationship between predators and prey in food webs and food chains, there is still limited information due to the difficulty of identifying digested food. In connection with this, this study aims to identify the morphology shape index value otolith of Japanese threadfin bream. Sampling was carried out at the Labuang Maros Fish Landing Site with 150 samples and morphometric data were collected from 150 pairs of otoliths in April and May 2023. The calculation of the shape index uses six descriptors, which include form factor (FF), roundness (RO), circularity or compactness (C), rectangularity (Rt), ellipticity (E), and aspect ratio (AR). The results showed that there was no significant difference in the otolith morphometry of the right and left otoliths (P>0.05). Based on the shape index value obtained, it explains that the morphometric shape of the otolith of Japanese threadfin bream tends to be oval, elongated, and has an irregular surface
Analysis of Plankton Abundance, Diversity and Dominance along the Siddo Coast in Barru Regency, Indonesia
No full textThis research aims to determine the level of abundance, diversity, uniformity, and dominance of plankton in the waters of Siddo Beach, Barru Regency. The research was carried out at three research locations, namely location 1, namely the hatchery location and Siddo Beach Bay; location 2, namely the location around the pier and mangroves; and location 3, namely the location around the community settlement in Toe hamlet, Barru Regency. Plankton in this location needs to be researched because there are many environmental forces that can disrupt the existence of plankton. Analisis plankton dilaksanakan di Laboratorium Kimia dan Air Politeknik Pertanian Negeri Pangkep. Data selanjutnya dianalisis dengan analisis deskriptif. The results showed that the abundance of plankton at location 1 was highest for plankton of the Navicula sp type; at location 2, the highest was for plankton of the Oscilatoria sp type; and the abundance of plankton at location 3 was highest for plankton of the type Acartia sp. The average diversity of plankton at the research location is in the range of 0.1526795-0.20716, the uniformity of plankton at the research location is in the range 0.06144279-0.10646145, and the dominance of plankton at location 1 is highest in Cosconidiscus sp type plankton, location 2 is dominated by Oscilatoria sp type plankton, and location 3 is dominated by plankton of the Acartis sp type. Thus, there is no type of plankton that has the highest abundance and dominance for all research locations
Effectiveness of Various Plant Crude Extract on Controlling Parasitic Ciliates (Colpoda sp.) Affecting Fishes
No full textAquaculture plays a crucial role in the national economy of many countries. Ciliate protozoans are recognized as economically significant parasites in fish aquaculture. Colpodean ciliates are particularly abundant and are commonly found in terrestrial settings such as soils, leaf litter, and mosses. Diseases are recognized as significant impediments to sustainable animal production, leading to substantial economic losses, particularly in the aquaculture sector. Traditional medicinal plants offer a promising alternative for controlling various diseases in aquaculture. This study examined the efficacy of several plant extracts, including tobacco, neem paste, rue seeds, thyme seeds, and pepper seeds, in managing ciliates. Among the tested plant extracts, Colpoda cultures treated with rue seeds demonstrated the highest effectiveness