Open Access Short communication

Aquaculture Recovery in Shizugawa Bay, Japan: Post Tsunami Recovery

Peter W. Wilson, Tanya L. Park, Beatrice Harrison-Day, Davis Hinton, Laura Nilssen, Matthew Rose, Stuart Isles

Asian Journal of Fisheries and Aquatic Research, Page 42-47
DOI: 10.9734/ajfar/2021/v12i330237

This report outlines a study undertaken at Minamisanriku, a small coastal village on the East Coast of Honshu, Japan, in late 2018.  The area relies heavily on fisheries and aquaculture for economic stability. While there, scientists, community leaders and individuals involved in the fisheries and aquaculture industry were interviewed to gain a qualitative understanding of the impacts of the 2011 tsunami caused by the Great East Japan Earthquake, particularly on the oyster industry and aquaculture in general in the region.

The tsunami completely disrupted aquaculture operations, with a 93% loss of infrastructure. Consequently, stakeholders were presented with an opportunity to restructure in some way as they rebuilt the industry.  The resulting 66% reduction in some species densities within aquaculture lots has subsequently led to increased sustainability and increased product quality.  Those gains, paired with reduced material cost and efforts, have together resulted in a more socio-ecologically responsible aquaculture operation. This operation now generates at least same amount of revenue as pre-tsunami.

Open Access Minireview Article

A Mini-Review: Effect of Pandanus amaryllifolius Roxb Leaves for Fish Health

. Rosidah

Asian Journal of Fisheries and Aquatic Research, Page 31-41
DOI: 10.9734/ajfar/2021/v12i330236

In fish farming, problems often occur due to disease attacks. Disease attack can result in decreased production and quality of fish. This is very detrimental to cultivators. Disease control is an important factor to be acknowledged. The use of herbs is an alternative for disease control that is relatively safe. Pandanus amaryllifolius Roxb plants are known to contain several secondary metabolite compounds, namely achaloid, flavonoids, tannins and steroids which are antibacterial and antioxidant. The results of the study show that this plant species from the Pandanaceae family can be used for treatment and prevention of disease-infected fish. The purpose of this article is to describe the compounds contained in P. amaryllifolius and their benefits for fish health. P. amaryllifolius gives a positive effect on health of fish, it can be used to treat and prevent disease in fishes.

Open Access Original Research Article

Analysis of the Structure of Economic Growth in the Fisheries Sector Study Case at Bogor District Indonesia

Dinda Aulia Febrisya, Achmad Rizal, Yuli Andriani, Asep Agus Handaka Suryana

Asian Journal of Fisheries and Aquatic Research, Page 1-8
DOI: 10.9734/ajfar/2021/v12i330233

This study aims to analyze the theory of economic growth and analyze the growth rate of the fisheries sector in the Bogor District based on a comparison of the total gross regional domestic production (GRDP) of cities and provinces. The research began in January 2021 until April 2021. The research method was carried out by survey methods collected both through decision surveys which were then analyzed quantitatively and presented descriptively. This research data comes from secondary data. The data was generated from interviews with the Department of Fisheries and Livestock staff in Bogor District, BPS Bogor District, BPS West Java Province, and Bappeda Bogor District. Data analysis included Shift Share Analysis and Location Quotient Analysis. Based on research conducted on the Analysis of the Economic Growth Structure of the Fisheries Sector in the Bogor District, it can be concluded that the Fisheries Sector is aprimary sector in the Bogor District with an LQ value of 1.2712. The results show the growth value of the net shift in the production of the fisheries sector in Bogor District with an average from 2015-2019 of -1.331.821,44. The fisheries sector shows a PB value <0, meaning that the fisheries sector in Bogor District has a slow growth rate.

Open Access Original Research Article

The Maturity of Female Gonads of G2 Transgenic Mutiara Catfish (Clarias sp.)

Ayuniar Puteri, Ibnu Dwi Buwono, Roffi Grandiosa Herman, . Iskandar

Asian Journal of Fisheries and Aquatic Research, Page 9-19
DOI: 10.9734/ajfar/2021/v12i330234

The G2 trangsenic Mutiara catfish (Clarias sp.) (MTG) is a Mutiara catfish that is inserted with the CgGH gene (Clarias gariepinus Growth Hormone) through the transgenesis. The effect of transgenesis stimulates gonad growth of G2 transgenic Mutiara catfish (Clarias sp.) faster than non-transgenic fish. Study aimed to analyze the maturity of the gonads and the spawning ability of female G2 transgenic Mutiara catfish (Clarias sp.) to obtain superior broodstock candidates. Experimental method with completely randomized design (pair of parents used as treatment and repeated four times) for spawning was used for this study. Three pairs of parent G2 were crossed semi-artificially as treatment A (female 1 MTG G2 crossed with male 1 MTG G2), B (female 2 MTG G2 crossed with male 2 MTG G2) and C (female 3 MTG G2 crossed with male 3 MTG G2). The results showed that the performance of female G2 transgenic Mutiara catfish (Clarias sp.) (treatment A, B and C) was higher given non-transgenic with an average relative fecundity of 82,438 eggs / kg of broodstock, an average egg diameter of 1.76 mm and an average egg weight 1.75 mg. These indications suggest that GH transgenesis increases gonadal maturity. The gonad maturity profile reached the stage of complete maturity (full ripe) compared to Sangkuriang catfish (Clarias gariepinus) (immature gonads). Therefore it is necessary to compare the reproductive performance of G2 transgenic Mutiara catfish (Clarias sp.) with non-transgenic fish (Sangkuriang) as candidates for superior broodstock of catfish.

Open Access Original Research Article

Ichthyofauna of Endemic Fish in Towuti Lake, Luwu Timur Regency, South Sulawesi, Indonesia

. Jayadi, Muhammad Natsir Nessa, Andi Tamsil, . Harlina, . Ernaningsih, . Nursyahran, Abdul Muqtadir

Asian Journal of Fisheries and Aquatic Research, Page 20-30
DOI: 10.9734/ajfar/2021/v12i330235

Aims: The aims of this study to determine the biodiversity of endemic fish in Lake Towuti, Luwu Timur Regency South Sulawesi, Indonesia.

Study Design: The research was conducted by survey

Place and Duration of Study: The research was carried out in February until March 2021 in Tanjung Timbala; Tanjung Lengkobutanga; Tanjung Bakara; Tanjung Saone and. Tanjung Tominanga at Lake Towuti, Luwu Timur Regency South Sulawesi, Indonesia.

Methodology: Fish samples were carried out every week using a trap net for 8 weeks. Fish samples obtained from each station were separated according to species. Fish samples were preserved with 4% formalin and then immersed in 70% alcohol before species identification was conducted. Data analysis in this research used descriptive statistics.

Results: The endemic fish species was found is telamtherina bonti Telmatherina bonti, Telmatherina celebensis, Paratherina striata, Tominanga sanguicauda, Tominanga aurea Oryzias profundicola, Oryzias matanensis, Oryzias marmoratus, Mugilogobius hitam, Glossogobius flavipinnis, Glossogobius matanensis and Dermogenys megarhamphus. The percentage of endemic fish caught at each station on Lake Towuti was different. The water quality parameters obtained are as follows Temperature: 26.40⁰C-30.30⁰C, pH: 6.35-9.03, dissolved oxygen (DO):6.25-8.95 mg/L and NO3-N: 0.023-0.066 mg/L.This water quality were suitable for the survival and growth of endemic fish.

Conclusion: Endemic fish families were obtained such as Telmatheridae, Adrianichthyidae, Gobiidae and Hemiramphidae and a total of twelve endemic fish species were found in this study. The number of endemic fish was found to be different at the station. Water quality parameters play an important role in the distribution and existence of endemic fish in Lake Towuti.