Journal of Aquaculture Science

Back Matter

2024-10-30T09:57:43+07:00

Conservation Challenges for Macrognathus acuelatus: A Case Study of Threatened Fish in Bengawan Solo and Brantas Rivers, East Java

2024-07-05T02:40:20+07:00

Macrognathus aculeatus is a local fish from the Bengawan Solo and Brantas Rivers threatened with extinction. Due to the lack of literacy on the biology of this fish. Biological parameters can be used to determine the condition of this fish in nature. Field observations at five stations from the two rivers were conducted to obtain samples. Biological and reproductive parameters such as weight and length, gonad maturity level (GML), Gonadosomatic Index (GSI), Hepatosomatic Index (HSI), and Condition Factor (CF) were the parameters observed in this study. All data obtained were presented as mean and standard deviation. Furthermore, analysis of variance was conducted using ANOVA (p < 0.05) to determine differences in samples from each observation station. The results showed that some biological factors had significant results (p < 0.05) on Gonadosomatic Index and Hepatosomatic Index). However, there was no significant difference (p > 0.05) in the condition factor. On the other hand, there were significant differences (p < 0.05) in body weight, total length, ovary weight, and fecundity parameters across all sampling sites.

Management Challenges of Marine Ornamental Fish and Their Utilization as The Sustainable Potential Marine Resources

2024-06-26T15:58:02+07:00

Coral ornamental fish become potential fishery commodities, providing opportunities and challenges in managing fishery resources in Indonesia. This activity has long been done and has become one cause of damage to coral reefs in Indonesia. Changes in paradigm and technology currently applied in Indonesia are expected to provide a gradual regulatory and coral reef ecosystem improvement. The commercial trade of ornamental fish requires attention and rigorous regulation. The marine ornamental fish trade activity is expected to improve and drive the coastal communities' economy. The significant increase in exploitation is expected to be controlled with the right regulations. This regulation must refer to the concept of sustainable development established through the Sustainable Development Goals (SDGs), especially SDGs number 14 concerning life underwater. The existence of reef fish is enough to provide economic movement, which continues to heat up, especially after the pandemic and the reopening of flights and export activities abroad. However, multi-stakeholders should ratify the concept of sustainability and environment-friendliness. Support from the government, academia, industry, and community groups must be aligned and in tune to achieve sustainable development goals. Providing accurate information related to the biological characteristics of reef fish is an essential contribution for researchers that can be used directly by the community. Thus, the exploitation of reef fish can align with efforts to conserve coral reef ecosystems closely related to global warming and climate change.

Potential Reduction of Stress Levels and Improving Vaname (Litopenaeus vannamei) Growth Performance with Probiotic Application

2024-07-05T07:54:24+07:00

The aim of this research was to find the most effective type of probiotic for the growth, survival, and stress resistance of L. vanamei. L. vanamei shrimp measuring PL 13 with a density of 2 fish/L of water were used as subjects for this research, which was conducted at the Poniang Beach Fish Seed Center from July 27 to September 24, 2023. This study was conducted using a completely randomized design (CRD) and consisted of four treatments and three repetitions, namely the operational standard, Bacillus sp., Lactobacillus sp., and a combination of Bacillus sp. and Lactobacillus sp. with a dose of 20 ml/kg mixed into feed containing 30% protein. The results of the study showed that the use of probiotics had no significant impact (p > 0.05) on the growth and survival of L. vanamei.

Effect of the Booming Tilapia Cage Culture on The Water Quality in Selected Bays of The Bukavu Basin, Lake Kivu, Democratic Republic of The Congo

2024-07-18T03:51:05+07:00

This study aimed to assess the impact of the Nile Tilapia (Oreochromis niloticus) cage fish farming on the water quality in two selected bays of the Bukavu basin, Lake Kivu. Physicochemical parameters (pH, temperature, electrical conductivity, total dissolved solids, salinity, dissolved oxygen, transparency) were measured in situ using a COMBO HI 98129 multi-parameter probe, PCE-PHD1 probe, and a Black and White Secchi disk. Water samples at different depths were collected using a Van-Dorn Sampler and phosphate, ammonia, nitrite, silicate, and chlorophyll-a were analyzed using a UV-VIS spectrophotometer. The results revealed that the pH, temperature, total dissolved solids, salinity, and transparency were significantly different (p ≤ 0.05) between the bays with cages and at the control bay, which may be due to the low movement of water, and the density of fish inside the cages. The water nutrients such as phosphate, ammonia, nitrite, silicate, and primary productivity were significantly different (p ≤ 0.05) within the bays with cages than at the control bay without cages. Overall, the results demonstrate that Tilapia cage culture contributes to the deterioration of water quality parameters accelerating the eutrophication process in Bukavu basin, Lake Kivu. Therefore, the study recommends relocating the cages to the bays not impacted by the anthropogenic activities from the catchment and regulating fish feeding according to the bioavailability of nutrients in the bays.

Combination of Chitosan Nanoparticles and Modified Tapioca-Whey Protein in The Preparation of Edible Coating on Antibacterial Activity and Organoleptic of Tenggiri Fish Products

2024-10-02T11:05:13+07:00

Product otak-otak ikan tenggiri is a promising fishery diversification product but is prone to spoilage. Edible coatings can help slow down spoilage. The purpose of this study was to determine the effect of different edible coating formulations on the characteristics of edible coating and to determine the protective potential of edible coatings against bacterial growth and organoleptic product otak-otak ikan tenggiri during storage. This research is an experimental study that is divided into two stages, the first stage is the characteristics of edible coatings using a completely randomized design (CRD) with testing including antimicrobial activity, water absorption, and viscosity with 5 treatments and 4 replicates, and the second stage is coating applications on the length of storage of product otak-otak ikan tenggiri testing including TPC and organoleptic using two-factor CRD 3×6 treatments and 3 replicates. Results indicated a significant impact (P < 0.05) of coating formulations on these characteristics. The best formulation, modified tapioca-WPI with CSNP (P4), showed antibacterial activity with a 9.16 mm inhibition zone, 3.46% water absorption, and 15.33 cP viscosity. This formulation maintained microbial stability and organoleptic quality for up to 3 days at room temperature and 12 days under cold temperature.

Combination of Chitosan Nanoparticles and Cellulose Derivatives in the Preparation of Edible Coatings: Effects on Bacterial Activity and Organoleptic Properties of Tenggiri Fish Pempek

2024-10-02T11:00:15+07:00

Pempek is a very popular traditional Indonesian food because it has a delicious taste. However, the shelf life of pempek is only about 16 hours at room temperature. This study aims to develop and evaluate edible coatings based on cellulose and chitosan nanoparticles (CSNPs) to extend the shelf life of pempek from Tenggiri fish (Scomberomorus commerson). This study is experimental research divided into two stages. The first stage involves characterizing the edible coating using a Completely Randomized Design (CRD), with tests including antimicrobial activity, water absorption, and viscosity, conducted with 5 treatments and 4 repetitions. The second stage involves applying the coating to pempek and evaluating its shelf life, focusing on TPC and organoleptic qualities using a two-factor CRD with 3×6 treatments and 3 repetitions. The results showed a significant effect (P<0.05) of various formulations on the characteristics of edible coatings. The results showed that the variation of cellulose derivatives and CSNP in the preparation of edible coating significantly affected the coating characteristics (P<0.05). The combined formulation of CMC and CSNP (P5) was selected as the pempek coating, with antibacterial activity of 9.31 mm, water absorption of 1.23%, and solution viscosity of 33.50 cPa.s. In the second stage, the treatment of pempek coating with CMC and CSNP (C2) effectively maintained the quality of pempek until day 3 at room temperature and day 12 at refrigerator temperature.

In Vitro Evaluation of Brown Algae Extract from Sargassum aquifolium in Inhibiting Aeromonas hydrophila, the Causative Agent of Motile Aeromonas Septicemia (MAS)

2024-10-14T10:48:28+07:00

The widespread use of antibiotics in aquaculture has been associated with the development of multidrug resistance in the environment and in humans. This is also exacerbated by the application of high stocking densities in fish farming systems, including catfish (Clarias sp). This study aims to see the potential of Sargassum aquifolium extract, which is a brown macroalgae, as an antibacterial agent for fish disease, Aeromonas hydrophila. Previous studies have revealed the phytochemical profile of S. aquifolium extract, but its effectiveness as an antibacterial agent has not been studied. The ethanol extract concentrations used were 20%, 40%, 60%, 80%, and 100% with two repetitions. The MIC test method was carried out to determine the lowest concentration of S. aquifolium ethanol extract that could inhibit the growth of Aeromonas hydrophila bacteria, while the MBC test was carried out to determine the bactericidal properties against A. hydrophila bacteria. SEM analysis was carried out to determine the morphological damage to A. hydrophila bacterial cells that had been treated with S. aquifolium ethanol extract. Based on the results, it was revealed that S. aquifolium extract could inhibit the growth of A. hydrophila highest with a very strong category at a concentration of 100%. The MIC value of S. auifolium extract was shown at a concentration of 100% but did not cause bacterial cell death based on the MBC value and SEM observations. These findings indicate that S. aquifolium extract has the potential to inhibit the growth of A. hydrophila. Increasing in vivo parameters such as the immune system, production performance, and survival in catfish is still needed to strengthen these results.

The Effectiveness of β-Glucan Saccharomyces cerevisiae and Endophytic Bacteria Sonneratia alba Leaves on the Immune Response of Litopenaeus vannamei Infected with Vibrio harveyi

2024-09-02T08:08:03+07:00

Vibrio harveyi can cause mass death in vaname shrimp. The β-Glucan content in Saccharomyces cerevisiae can stimulate the immune system non- specifically. Meanwhile, the endophytic bacteria Sonneratia alba has antibacterial activity. This study aims to determine the effectiveness of the probiotic fee formulation of β Glucan S. cerevisiae using a combination of antibacterial S. alba leaves as an effort to inhibit the growth of V. harveyi in vaname shrimp (L. vannamei). The research method used is an experimental probiotic formulation from a combination of β Glucan S. cerevisiae and endophytic bacteria S. alba through shrimp feed with 6 treatments and 4 replications, The parameters used are Total Haemocyte Count, Differential Haemocyte Count and Survival Rate. This study was conducted in vivo tests for 10 days of probiotic feed maintenance and 7 days of infection with a total research period of four months at the Faculty of Health, Medicine, and Natural Sciences, Airlangga. The results of the research show that the combination of ingredients can inhibit the growth of V. harveyi through the immune response and survival of vannamei shrimp. The best treatment was P3 with a Total Haemocyte Count (THC) of 7,54x106 cells/ml and Differential Haemocyte Cout (DHC) (60,56% granular, 16,68% semi-granular, 22,76% hyaline) with 85% survival. The provision of probiotics had a real effect and became the optimum formulation to inhibit the growth of V. harveyi.

The Characterization of Gold Nanoparticle (NP-AU) Biosynthesis with Bioreductor Chaetoceros calcitrans as a Disease Inhibitory Power of AHPND in Vannamei Shrimp (Litopenaeus vannamei)

2024-10-09T12:35:20+07:00

Indonesia is the third largest global shrimp exporter after Ecuador and India. Shrimp production increased by 21% from 1.21 million tons to 1.48 million tons in 2021-2022, but decreased to 1.097 million tons in 2023. This is thought to be due to AHPND (Acute Hepatopancreatic Necrosis Disease). Our research aims to determine the biofabrication, characterization and effectiveness of gold nanoparticle biofabrication mediated by Chaetoceros calcitrans as an antibacterial against AHPND in white shrimp. The method used is experimental. The findings were the antibacterial potential of gold nanoparticle biofabrication mediated by C. calcitrans as an AHPND drug in vaname shrimp. Based on the research results, biofabrication was successfully formed with UV-vis characterization at a wavelength of 533 nm, in the FTIR test the AU3+ group was successfully reduced by the bioactive compound C. calcitrans. The results of the SEM and TEM tests showed that nanoparticles were dominated by a spherical shape, the particle size according to the PSA test was 8.25 nm and the XRD test answered that Np-Au crystallization had formed with the appearance of a high intensity peak.

Front Matter

2024-10-30T09:56:39+07:00