Asian Journal of Fisheries and Aquatic Research

Minapadi is an integration of rice cultivation with fish breeding in one location. This research was conducted in the village of Talagasari, District Garut Kadungora because this area is thought to have nutrient elements in the form of specific micro and macro minerals that are good for agriculture and fisheries. Planktons are microscopic organisms that form an important link in the life of aquatic organisms. This research aimeds to analyze the quality of water, mineral composition and its effects on plankton community structure in minapadi. The research method used was purposive sampling. Plankton relationship with water quality and dissolved minerals were analyzed using a Canonical Correspondence Analysis (CCA). Sampling was done 6 times in the period May 20 - July 25, 2018. Research shows that there are 31 orders of plankton consisting of 26 orders of phytoplankton and 5 order of zooplankton. Phytoplankton diversity index and dominance over their respective research ranged from 0,5149 to 0,8797 and 0,1203 to 0,4851, while for zooplankton from 0 to 0,8 and from 0,2 to 0,1. The water quality parameters measured primarily by temperature, DO, pH, nitrates, phosphates, ammonia qualify recommended PP 82 2001, third class. There is a concentration of dissolved minerals that exceeds the normal condition nitrates, phosphates, ammonia qualify recommended PP 82 2001, third class. There is a concentration of dissolved mineral exceeds the normal condition K, S, Si, Ca, Fe, Mn, Cu, and Cl, which led to the dominance of the phylum Euglenophyta, Bacillariophyta, and arthropods.

Aims: Water quality is one of them being an important role in terms of cultivation. Good water quality can support growth productivity in aquaculture. This is also of great concern when the rest of fish metabolism results that can contaminate fish contained in the maintenance media and if water is changed every day, water carrying toxins can pollute the area around the cultivation. One of the first steps to reduce the toxic content found in the maintenance media and the area around cultivation is to use aquaponic cultivation using biofloc. It is also expected to minimize the toxin content in maintenance media. This research aims to determine the comparison of the polyculture stocking density of sangkuriang catfish and nile tilapia which results in water quality that supports fish productivity.

Study Design:  The research was conducted experimentally.

Place and Duration of Study: This research was carried out for 40 days between March 2019 - April 2019 in the Ciparanje Laboratory of the Faculty of Fisheries and Marine Sciences, Universitas Padjadjaran.

Methodology: The method used in this research is experimental using a completely randomized design (CRD), consisting of 5 treatments with 3 replications. The treatments to be given are dense stocking variations with the following treatments: A(75 catfish:75 tilapia), B(100 catfish:50 tilapia), C(125 catfish:25 tilapia), D(150 catfish), E(150 tilapia).

Results: Water Quality Measured During The Study Namely, DO, Temperature, Ph, Nitrite, Nitrate And Ammonia Are Still In The Threshold For The Growth Of Test Animals During Maintenance.

Conclusion: Based on the results of the research that has been done, it can be concluded that the quality of water in maintenance media using aquaponics biofloc gives good water quality values on maintenance media and is still within the threshold for the growth of catfish and tilapia.

To bridge the demand supply gap in the Nigerian fishing industry, the value chain analyses in artisanal fishing in the coastal area of Ondo States were investigated.

Primary data was used in the study. Purposive sampling technique was used to select four fishing communities in Ilaje local government, where 35 (fishermen, processors and marketers) were each selected randomly from the communities. Data were analyzed using Descriptive Statistics and Gross Margin Analysis.

The socioeconomic characteristic indicated that 68.6% of the fishermen, 77.2% processors and 65.7% marketers were less than 50 years of age. Result revealed that all the fishermen were male, 91.2 % processors and 97.10% marketers were female. 62.9% of the fishermen have household greater than 4, the processors has 54.3% household size above 4 and 60% of the marketers have household size above 4. 94.3% of the fishermen have one form of education or the other, 77.1% of the processors have one form of education or the other and 65.7% of the marketers were also educated. All the marketers are into one association or the other. Budgeting analysis indicated positive margin by the two categories of marketers was ₦300.54 and ₦1,866.00 per basket respectively, a net return of 1.04 and 1.30 respectively. Processors had a positive gross margin of ₦43.871.54 and a net return of 1.12. Most influential actor is the marketer.

Gillnet is a simple fishing gear that is widely used by fishermen in Pangandaran Regency. This study aims to determine the classification calculation of the value of hanging ratio gillnet and the catch of mackerel (Scomberomorus commerson) with different mesh sizes. This research was conducted in January 2019 in Pangandaran Regency, Indonesia. The method used in this research is the survey method. Gillnet used has 2 types of mesh sizes, 3,5 and 4 inch gill nets with each net length of 650 meters (7,312 mesh) and 750 meters (7,384 mesh). Gillnet has 12 meters with a net mesh size of 3,5 inches as many as 135 mesh and a 4 inch mesh size of 118 mesh. Hanging ratio for 3.5 inch gillnet is 0,56 while for mesh size 4 inch is 0,54. Based on these results, it can be concluded that the gill nets are selective. The proportion of catch results shows the number of target fish gill nets with a 3,5 inch mesh size is 20% and bycatch is 80%. The proportion of gillnet catches with a 4 inch mesh size shows main catch of 35,2% while the bycatch proportion is 64.8%.

Clarias gariepinus were infected with Aeromonas hydrophila and Pseudomonas aeruginosa, and blood samples were collected weekly for biochemical analysis to analyse their enzyme activities and pathogenesis for four weeks. The enzymes includes: aspartate aminotransferase (AST), alkaline phosphastase (ALP), acid phosphastase (ACP) and lactate – dehydrogenase (LDH). The fish were distributed in three different groups in triplicates as: control (C₁ C₂ C₃), A. hydrophila (A₁, A₂, A₃) and P. aeruginosa (P₁, P₂, P₃). After two weeks of acclimatization, A₁ – A₃ were injected with 1.5 ml of 10⁶ cfu/ml of A. hydrophila, P₁-P₃ were injected with 1.5 ml of 10⁶ cfu/ml of P. aeruginosa, while C₁-C₃ were pathogen free. At the end of the experiment, it was observed that there was a constant increase, in the enzyme activities of the infected fish, indicating increase in virulence with respect to weeks of exposure but P. aeruginosa had higher pathogenicity compared to A. hydrophila.