Open Access Original Research Article

Effects of Selected Tuber Crops Starch on Some Extrusion Properties of Fish Feed

A. M. Aderotoye, A. P. Olalusi, C. I. Ayo- Olalusi

Asian Journal of Fisheries and Aquatic Research, Page 1-12
DOI: 10.9734/ajfar/2020/v7i330117

This research evaluates the effect of feed formulation on fish feed properties with the aim of providing information on its water absorption and physical properties of the feed. The main objective of the study is to analysis the effects of the 3 tuber crops (dried cassava, potato and cocoyam flour) on the floatability of fish feed. The fish feed ingredients with varying percentage (40, 70 and 100) of starch from cassava, potato and cocoyam were extruded using a single screw extruder with constant screw speed (285 rpm). The resulting extrudates were subjected to extensive analysis of physical properties, which included moisture content, mass, surface area, volume unit density, bulk density and porosity. The water absorption properties include, the relative absorption rate (%), the water stability (%), the expansion ratio (%) and the floating ability rate (%) were also determined. There was a linear increment between the increase in starch with floatability and water absorption properties of cassava and cocoyam starch; however, a nonlinear decrease relationship existed in percentages (%) of potato starch. The formulation with 40% cocoyam has the highest floatability while the least floatability was observed from 100% potato at first 10 mins of observation. At 40% starches, 76.66% of cassava, 66.66% of potato and 100% of cocoyam afloat for the period of observation (10-120 mins). In conclusion, the formulation with 40% cocoyam was adjudged as the preferable feed composition based on its floatability. From the result, it can be recommended that cocoyam starch support the floatability of fish feed.

Open Access Original Research Article

The Contribution of Fisheries Sector in Regional Development of Batam City of Riau Islands Province, Indonesia

Heldo Parulian Siregar, Achmad Rizal, Herman Hamdani, Iwang Gumilar

Asian Journal of Fisheries and Aquatic Research, Page 13-23
DOI: 10.9734/ajfar/2020/v7i330118

This research aims to analyze the growth of the fisheries sector, analyze the commodity market strength of the fisheries sector and analyze the strength of the fisheries sector's base and non-base sectors in regional development in Batam City. The method used in this study is a quantitative method using secondary data cross-section and time series which are then analyzed using descriptive statistics, and qualitative methods using primary data obtained through interview questionnaires. Analysis of the data used is growth index analysis, Trade Area Capture (TAC) analysis, Pull Factor analysis (PF) and Minimum Requirement Approach (MRA) analysis. The results of the growth index analysis show that the GDP of the fisheries sector in the Batam City has increased by 126 % in the period 2013-2018. The results of the 2013-2018 TAC analysis showed that the TAC value> population indicated that Batam City was able to capture the opportunities of trade in fisheries products in other regions. PF value of the Batam City fisheries sector> 1 which shows that the Batam City region can attract customers from other regions and has a specialization in terms of fishery product markets. MRA analysis results in Batam City in 2017 obtained the largest base multiplier in BatuAji District with a value of 2.4 which means that every 20 workers in the base sector are expected to create 4 workers in the non-base sector.

Open Access Original Research Article

Effectiveness of Potassium Diformate on Feed to Improve Immune Performance of Goldfish (Carassius auratus L.)

Ayi Yustiati, Rima Tri Wahyuni, Achmad Rizal, Ibnu Bangkit Bioshina Suryadi

Asian Journal of Fisheries and Aquatic Research, Page 24-33
DOI: 10.9734/ajfar/2020/v7i330120

This research aims to determine the optimum potassium diformate (KDF) dosage which was added to feed to increase the immune status of goldfish (Carassius auratus L). This study was conducted from September 31 - November 15, 2019 at the Laboratory of Aquaculture and Molecular Biotechnology Laboratory of the Faculty of Fisheries and Marine Sciences, University of Padjadjaran. The research method used is the experimental Complete Random Design (CRD) with 4 treatments and 3 replications. The treatments are A (without KDF/control), B (0.1% KDF), C (0.3% KDF) and D (0.5% KDF). The observed parameters are survival rate, total leukocyte count (white blood cells), total erythrocyte count (red blood cells) and gross clinical sign. Observations were made after 30 days of KDF and post-test challenge by Aeromonas hydrophila for 14 days. Data on the number of total leukocyte count and total erythrocyte count were analyzed using F test and Duncan's advanced test at a 95% confidence level, while the gross clinical sign data were analyzed descriptively. The results showed that the KDF 0.3% was the optimum dose and was very effective in optimizing the performance of the goldfish immune system optimally, seen from the number of white blood cells and red blood cells which experienced the highest increase of 23.48% and 9.30%. After the challenge test, fish that were given KDF 0.3% had the highest survival rate of 46.67%. In addition, the process of recovering the number of white blood cells and red blood cells can be faster than other treatments, with a value of 12.85×104 cells mm3-1 and 0.96×106 cells mm3-1, marked also by the healing of clinical symptoms in the morphology of goldfish.

Open Access Original Research Article

Distribution of Blacktip Reef Sharks (Carcharinus melanopterus) Based on Habitat Characteristics by the Baited Remote Underwater Video (BRUV) Method in Morotai Waters of North Maluku

Wahyu Budi Sentosa, Isni Nurruhwati, Izza M. Apriliani, Alexander M. A. Khan

Asian Journal of Fisheries and Aquatic Research, Page 34-50
DOI: 10.9734/ajfar/2020/v7i330121

Morotai has abundant marine biological resources, sharks being one of them. The blacktip reef shark is one of the dominant types of coral reef sharks in Morotai waters. Worldwide shark are threatened due to the demand for shark fins and over fishing, to protect sharks is important to know their distribution so protected areas can be established. This research aims to examine the distribution of blacktip reef sharks (Carcharhinus melanopterus) based on habitat characteristics in the Morotai Waters. Through surveys and observation of coral cover, using the Line Intercept Transect (PIT) method and the Baited Remote Underwater Video (BRUV) to record the blacktip reef sharks who passed by the coral reef. Water quality parameters measured include temperature, salinity, visibility, acidity, current type, tides, and moon phases. Blacktip reef sharks were found in three of the four research stations. Station 4 was the one with the most blacktip reef shark appearances, amounting to 91 individuals. This station has the lowest sloping contour and has the smallest live coral cover of only 1%. Station 4 is dominated by sand covering 40%. All water quality parameters influence blacktip reef shark occurrence. The highest appearance of the blacktip reef shark happens during the new moon phase, when the tides are loose and the currents are quite strong.

Open Access Original Research Article

The Influence of Indian Ocean Dipole on Production of Tembang Fishing (Sardinella fimbriata) at Sunda Strait Indonesia

Delima Mentari Amara, Yuniar Mulyani, Alexander M. A. Khan, Herman Hamdani

Asian Journal of Fisheries and Aquatic Research, Page 51-58
DOI: 10.9734/ajfar/2020/v7i330122

Tembang is a pelagic fish which is important in Indonesia and the development on the Sunda Strait. The Indian Ocean Dipole could affect oceanography and at the same time will affect the population of fishes. The aim of this study was to determine the effect of IOD and oceanographic factors on the catch of Tembang fish. This research was conducted in the Sunda Strait waters by looking at the Dipole Mode Index (DMI) and oceanographic ocean conditions such as sea surface temperature and chlorophyll as well as the production of fish catches for 11 years from 2008-2018. IOD affects the catch of Tembang fish by 35.8%. Temperature influences the catch of Tembang fish in the Sunda Strait by 9.48%. Klorofil-a influences the catch of Tembang fish in Sunda Strait by 38.6%. DMI, Temperature, and Chlorophyll affect fish catches by 26.9%.