Garuda - Garba Rujukan Digital

Gadis Sri Haryani

Unknown Affiliation

Author-ID : 3192960

Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Engineering Environmental Science

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ANCAMAN JENIS IKAN ASING LOUHAN TERHADAP IKAN ENDEMIK DI DANAU MATANO, SULAWESI SELATAN Syahroma Husni Nasution; Gadis Sri Haryani; Rahmi Dina; Octavianto Samir
BERITA BIOLOGI Vol 18, No 2 (2019)
Publisher : Research Center for Biology-Indonesian Institute of Sciences

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/beritabiologi.v18i2.2993

Lake Matano is one of the ancient lakes in Sulawesi where some endemic fish species of Telmatherina, Mugilogobius, Oryziasand Glossogobius matanensis lived. The presence of alien species can be on threat for the loss of biodiversity in fresh waters, including endemic fish in Lake Matano. The research aim to review the threat of louhan fish as alien species to endemic fish in Lake Matano. The study was conducted in Lake Matano at five stations in April and August 2015 namely Lawa, Nuha, Petea, Pantai Impian, and Pantai Kupu-kupu. Sam-ples were collected using experimental gillnet with mesh size of ¾; 1; 1¼; 1⅟2; 2; 2,5; and 3 inches. Fouteen species were found consist of 10 endemic species and red list.These were three of genus Glossogobius, seven species of Telmatherina, and four alien species of the carp (Cyprinus carpio), louhan, gourami (Trichopodus trichopterus), and tilapia (Oreochromis niloticus). The most common species of endemic fish is T. antoniae. Louhan is the result of a hybrid species Amphilopus citrinellus x Cichlasoma trimaculatum. The abundance of louhan is 64 in April and 40 fishes in August, respectively at a time caught. The percentage ratio of louhan to endemic fish was of 8.6% and 18.3%. This indicated that the louhan fish tend to be invasive and certainly threatened endemic fish survival in this lake. The maturity of gonads of louhan is in the level of I - IV that enables the fish to reproduce quickly.

Flood Pulse and Aquatic Habitat Dynamics of The Sentarum Floodplain Lakes Area Hidayat Hidayat; Siti Aisyah; Riky Kurniawan; Iwan Ridwansyah; Octavianto Samir; Gadis Sri Haryani
Indonesian Journal of Limnology Vol. 1 No. 1 (2020): Indonesian Journal of Limnology
Publisher : Indonesian Society of Limnology

The Lake Sentarum is a complex of floodplain lakes in the middle part of the Kapuas River system in West Kalimantan, Indonesia. The area has a great ecological and economic importance, however, the Sentarum lakes complex and its catchment area are generally threatened by deforestation, fire, monoculture agroindustry, and pollution.The objective of this research is to establish the hydrological characteristics of the Sentarum lakes area and to reveal the dynamics of aquatic habitat resulted from changing water levels. Data were collected during our field campaigns of 2013-2017 representing the seasons. The water level was measured using a pressure sensor placed at the Lake Sentarum National Park resort, while rainfall data were obtained from the data portal of the Tropical Rainfall Measuring Mission. Inundation monitoring was carried out using a time-lapse camera. A hydrological model is used to simulate water levels beyond measurement period. Water quality and fish sampling were carried out at the lake area. Vegetation observation was carried out at the selected riparian zone of the lake area using the line transect method. Water level records show that the Sentarum floodplain lakes have two peaks of inundation period following the bimodal pattern of rainfall in the equatorial Kapuas catchment. This water level dynamics induced changes in water quality, nutrient availability, vegetation cover, and fish diversity found in the Sentarum lakes area. Despite its seasonal changes, water quality of Sentarum lakes is generally good and suitable for aquatic biota. Fish diversity of the Sentarum lakes is relatively higher during high water periods.

Kinerja Reproduksi Induk Ikan Bada Rasbora argyrotaenia (Bleeker, 1849) Melalui Pemberian Kombinasi Estradiol dan Spirulina dalam Pakan Ira Akhdiana; Muhammad Zairin Jr; Gadis Sri Haryani; Muhammad Agus Suprayudi
LIMNOTEK Perairan Darat Tropis di Indonesia Vol. 28 No. 2 (2021)
Publisher : BRIN Publishing

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55981/limnotek.2021.13386

Reproductive Performance of Bada Fish Rasbora argyrotaenia (Bleeker, 1849) Through Combination of Estradiol and Spirulina in Feed. Bada fish (Rasbora argyrotaenia) is a type of fish from Lake Maninjau, West Sumatra, which has high economic value. Efforts to increase the reproductive ability of Bada broodstock were carried out by improving the quality of the feed through the addition of nutrients and hormonal stimulation to fish feed. This study aimed to improve the reproductive performance of female Bada broodstock by providing a combination of the estradiol-17 hormone and spirulina in the feed. The treatments tested in this study included control feed without the addition of the estradiol-17 hormone and spirulina (P0), the addition of the estradiol-17 hormone at 7 g/kg of feed (P1), the addition of spirulina at 30 g/kg of feed (P2), and the addition of a combination of estradiol17 hormone and spirulina at 7 g/kg feed and 30 g/kg feed, respectively (P3). This experimental study used a completely randomized design method with four treatments and four replications. The relative fecundity value was calculated by comparing the number of eggs and the weight of the brood fish. Fecundity value was obtained by the gravimetric method. The results showed that the relative fecundity was 730–1,126 eggs/kg brood weight, the degree of fertilization was 80.91–92.90%, and the hatching rate was 59.7–84.0%. The value of the gonadal development index increased along with the rate of gonadal development due to the process of oocyte development which caused the size of the ovaries to increase in the female fish. The relative fecundity values in the experiments P2 and P3 were higher than those in P0 and P1. This is because the increase in vitellogenin synthesis was followed by an increase in the number of oocytes that will absorb the vitellogenin. This study proves that the addition of the estradiol17 hormone and spirulina into the feed can improve the reproductive ability and egg quality of Bada fish.

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