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Dony Prasetyo
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Kampus III (3rd Campus) Universitas Muhammadiyah Malang, GKB 1 (1st Building), Lantai 5 (5th floor), Aquaculture Department (Room 505)
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Kota malang,
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INDONESIA
Indonesian Journal of Tropical Aquatic
Published by Universitas Muhammadiyah Malang
ISSN : -     EISSN : 26224836     DOI : -
Core Subject : Agriculture,
Agriculture, Biological Sciences & Forestry
Indonesian Journal of Tropical Aquatic (IJOTA) is open access publishes papers two times a year in February and Augst. IJOTA will publish the research results useful for the sustainability of fisheries. IJOTA is a scientific journal that discusses the results of research in science, technology, marine and freshwater fisheries that have not been published. Articles should be created in a language that is easily understood by non-specialist readers in the topic of the article itself, but interested in research. This scientific article includes the results of research on Aquaculture (Fish Nutrition, Fish Health and Diseases, Water Quality, Fish Genetics Improvement and Breeding, Fisheries Engineering and Biotechnology), Aquarium Sciences, Aquatic Ecology (Marine, Brackish, Freshwater), Conservation of Aquatic Resources and also Coastal Management. A journal script should be written in English.
Arjuna Subject : Ilmu Pertanian dan Biologi (Semua) - Ilmu Perairan
Articles 6 Documents
 1 
Search results for , issue "Vol. 2 No. 2 (2019): August" : 6 Documents clear
Effect of periodic fasting on growth and feed efficiency in Giant Freshwater Prawn (Macrobrachium rosenbergii, de Man 1879) Waskito Dwi Utomo; Riza Rahman Hakim; Ganjar Adhywirawan Sutarjo
IJOTA (Indonesian Journal of Tropical Aquatic) Vol. 2 No. 2 (2019): August
Publisher : Universitas Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/ijota.v2i2.6679

Abstract

There are obstacles in the aquaculture business that is still often facedbyfarmers, one of the challengesisthe high price of commercial feed. Feed as an energy source for growth is a reasonably high-cost component in production that reaches 40-89 %. In the control of food for efficiency, it could be done by the fasting method. This research was aimedtoanalyze the effect of periodic fastedofgiant prawn (Macrobrachium rosenbergii de Man, 1879) against growth and feed efficiency. This research was conducted at IBAP Installation, Probolinggo District - East Java Province. The experimental method used completely randomized design with five treatments and three replications, such as; P0: feeding without fasting (as control), P1: a-day fasted, a-day feeding, P2: a-day fasted, two-days feeding, P3: a-day fasted, three-day feeding, P4: a-day fasted, four-days feeding, P5: a-day fasted, five-day feeding. The results showed that periodic fasted of M. rosenbergii no significant effect on the daily growth rate, absolute weight growth, and feed efficiency. However, by looking at the rate of growth, thisfasting methodcouldbe used as an alternative to saving feed. The P5 showed the most effective in increasing daily growth rate, absolute weight growth, and effectiveness of giant prawn feeding. The strategy of periodic fasted to increase the production of giant prawns should consider the other supporting factors such as ideal water quality (pH, temperature, and DO), proper stocking density, and feeding periods on schedule.
Effect of different stocking densities on growth and survival of Seabass Fish (Lates calcarifer) nursery phase in low salinity Mochammad Noval; Hany Handajani; Hariyadi Hariyadi
IJOTA (Indonesian Journal of Tropical Aquatic) Vol. 2 No. 2 (2019): August
Publisher : Universitas Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/ijota.v2i2.9595

Abstract

Increased production of Seabass fish (Lates calcarifer) influences the stocking density used. The purpose of this study was to determine the growth and survival of Seabass (Lates calcarifer) at different densities of low salinity stocking. The study was conductedin May-June 2019 at the Laboratory of Fisheries, University of Muhammadiyah Malang. The material used in the study of Seabass fish (Lates calcarifer) as many as 550 fish with a size of 7 cm and fish feed in the form of B2 Stella. The method used was experimental with a completely randomized design (CRD) with 4 treatments and 3 replications, namely 1 fish/2 L as control (A); 2 fish/2 L (B); 3 fish/2 L (C); 4 fish/2 L (D). Data analysis used anova(P <0.05) and tested further with the Least Significant Difference Test of 5%. The results showed that treatment B (51 ± 2 fish/2 L) produced a specific growth rate of length and weight, survival rate, efficiency of feed utilization, and feed conversion ratio which was better than treatment A (67 ± 1 fish/2L (control)), C (44 ± 3 fish/2 L and D (38 ± 4 fish/2 L).
Analysis of fresh water ornamental fish production (Goldfish, Koi and Betta Fish) in Tulungagung district, East Java, Indonesia Miftachul Andriyan Afnan; Ganjar Adhywirawan Sutarjo; Hariyadi Hariyadi
IJOTA (Indonesian Journal of Tropical Aquatic) Vol. 2 No. 2 (2019): August
Publisher : Universitas Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/ijota.v2i2.10033

Abstract

Freshwater ornamental fish such as carp, koi, and betta fish is a kind of a very potential happy developed in the Tulungagung district. The total production in the last 3 years is still above the average production of other freshwater ornamental fish. This study aims to know the best influence on the production of freshwater ornamental fish by the influence of capital, cultivation pond, manpower, and technology. The method of research used is by the purposive sampling method of predetermined culture. Furthermore, the data that has been in can be inserted into SPSS 18 which is in multiple linear regression. The results of this research show that on the cultivation of goldfish, the production factor has a significant effect on the production and the technology variable has the highest beta coefficient of 0.364. For the cultivation of Koi fish, the production factor does not have a significant influence on the production, and the technology variable has the highest beta coefficient of 0.462. For betta fish farming, production factors have no significant effect on production variable and capital variables have the highest beta coefficient of 0.353 which means that production variables are heavily influenced by modal variables. Based on the results of the research can be concluded that out of all production factors, technology has the most influential likelihood on the marketing of freshwater ornamental fish.
Analysis of grouper business development in Gerokgak District, Buleleng Regency, Bali Province David Hermawan; Ganjar Adhywirawan Sutarjo; Abdul Aziz
IJOTA (Indonesian Journal of Tropical Aquatic) Vol. 2 No. 2 (2019): August
Publisher : Universitas Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/ijota.v2i2.11131

Abstract

Fisheries development is a human effort in increasing the utilization of all fishery's biological resources which include the fishery capture, aquaculture, and processing sectors. Grouper is a commodity that has high economic value, but the amount of aquaculture production is still low, one of which is in Gerokgak district.This research was conductedfrom February to March 2018, in Gerokgak District, Buleleng Regency,Bali Province. Dataobtainedthrough interviews, observations, documentation, and questionnaires directly with respondents, namely the Department of Maritime Affairs and Fisheries of Buleleng Regency, business owners, managers, and grouper farmers. The analysis used in this study was toobtaina grouper cultivation strategy using a SWOT analysis. From the results of the calculation of the analysis and determination of the SWOT matrix,thewgovernment must increase grouper aquaculture results by increasing the number of hatchery and enlargement businesses. The government is more responsive to the problems faced by farmers.
Effectiveness of extract Songga wood (Strychnos lucida) towards survival and antibody titers on Tilapia (Oreocromis niloticus) that infected Streptococcus agalactiae Anis Zubaidah; Sri Samsundari; Vivi Fitriani
IJOTA (Indonesian Journal of Tropical Aquatic) Vol. 2 No. 2 (2019): August
Publisher : Universitas Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/ijota.v2i2.11136

Abstract

Nile Tilapia or Tilapia Fish (Oreochromis niloticus) is one of commodity with a high number of consumers. But, Streptococcus agalactiae attack caused a decline in production. One way to reduce these diseases by using natural materials of songga wood (Strychnos lucida R.Br) where the songga wood contains many compounds like alkaloid, phenols, flavonoids, triterpenoids, which can inhibit bacterial growth by damaged cell membrane. The results showed that the inhibitory songga wood extract against Streptococcus agalactiae was highly significant, and shows with the highest survival rate of 90% and proved by theincreasingantibodytitersafteraddingsonggawood extract.
The influence of concentration liquid waste of tofu production to Daphnia sp cultivation biomass Tholibah Mujtahidah; Baruna Kusuma
IJOTA (Indonesian Journal of Tropical Aquatic) Vol. 2 No. 2 (2019): August
Publisher : Universitas Muhammadiyah Malang

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22219/ijota.v2i2.11148

Abstract

A natural feed of freshwater fish as long as it depends on worms tubifex is hard to be cultivated. Daphnia sp is one of the kinds of Cladocera zooplankton to be an alternative as a natural feed for seed of fish. The liquid tofu waste generally is a problem that is going on in every regional particularly around the Kedu Residency, Central Java. The liquid waste has the nutritional value that can be used for cultivation Daphnia sp. The right concentration of liquid waste tofu to the cultivation of  Daphnia sp. has not been studied. This research aimed to find out the influence of concentration out over the density of waste biomass and the visibility of morphology Daphnia sp. The experiment used Complete Randomized Design (CRD) with three treatments and three repetitions, 25:75, 50:50, dan 75:100 (TI, T2, and T3, respectively), tofu liquid waste and water.  The results concluded that T3 has repercussions for the density and biomass Daphnia sp. The density of Daphnia sp. was shown by treating 75 % of liquid tofu waste with 31.33 ind L-1 on average and while biomass was 4.6 g L-1 on average. The visibility of Daphnia sp morphology was cultivated with liquid tofu waste compared with Daphnia sp. cultivated using wastewater of catfish cultivation as a control group.Keywords: Biomass, Daphnia sp., Liquid tofu waste, Present of morphology

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