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All Journal Advances in Tropical Biodiversity and Environmental Sciences
Rievo Handry Djarang
Universitas Negeri Manado
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Earth & Planetary Sciences Environmental Science Immunology & microbiology Medicine & Pharmacology Veterinary Other

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Relationship Between Length and Weight and Habitat Conditions of Several Fish Species in Tondano Lake, Minahasa, North Sulawesi Rosenta Sipayung; Helen Joan Lawalata; Iriani Setyawati; Livana Dethris Rawung; Rievo Handry Djarang
Advances in Tropical Biodiversity and Environmental Sciences Vol. 7 No. 3 (2023): October 2023: Pages 87-124
Publisher : Institute for Research and Community Services Udayana University (LP2M Universitas Udayana)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2023.v07.i03.p01

Abstract

The snake-head gudgeon or payangka fish (Ophieleotris aporos), tilapia fish or mujair (Oreochromis mossambicus), and marble goby or betutu fish (Oxyeleotris marmorata) are economically important fish in Lake Tondano. However, numerous community activities can disrupt aquatic biodiversity, declining Lake Tondano environmental conditions, and other factors. This study aimed to determine the relationship between length and weight and the habitat conditions of Ophieleotris aporos, Oreochromis mossambicus, and Oxyeleotris marmorata. The method used in this study was purposive sampling with research stations located at Remboken (station 1), Kakas (station 2), and Tondano Estuary (station 3). Sampling was carried out 5 times in every 10 days. The weight and length of the fishes caught in Lake Tondano were 2-60 g and 1-8 cm (Ophieleotris aporos); 9-180 g and 6-25.5 cm (Oreochromis mossambicus); and 16-30 g and 2.6-26.5 cm (Oxyeletotris marmorata), all of them have an allometric growth pattern. Oreochromis mossambicus is the most commonly caught fish in all research stations. The research station with the best level of water fertility is Remboken Station. The habitat characteristic of Lake Tondano was 25-290C of water temperature; brightness of 1.34-2.66 m; depth of 4.23-11.8 m; pH of 6.7-7.8; and dissolved oxygen of 2.27-6.31 mg/L, which still supports the well-being of the fish.
Mangrove Biodiversity In Tatengesan Village, Pusomaen District, Southeast Minahasa Nofia Poluan; Helen Joan Lawalata; Wiesye Maya Selfia Nangoy; Meity Neltje Tanor; Rievo Handry Djarang
Advances in Tropical Biodiversity and Environmental Sciences Vol. 8 No. 1 (2024): February 2024: Pages 1-57
Publisher : Institute for Research and Community Services Udayana University (LP2M Universitas Udayana)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2024.v08.i01.p10

Abstract

Mangrove forest is a type of forest that grows in coastal areas and river estuaries and has three functions, namely ecological, social, and economic functions. The purpose of this study was to determine the level of diversity of mangrove species in Tatengesan Village, Pusomaen District, Southeast Minahasa Regency. Observations were made on a transect with a size of 50 x 25 m consisting of 4 plots. Mangrove sampling was carried out using a plot with a size of 10 x 7 m, using a purposive sampling method. Ecological index analysis includes species diversity, uniformity, and dominance. There are 7 mangrove species namely Bruguiera gymnnorhiza, Rhizophora mangle, Kandelia obovata, Avicennia marina, Rhizophora mucronata, Languncularia racemose, and Ceriops tagal. The species diversity index at the biological level is low.
Identification of Mangrove Zonation in Sondaken Village, Bunaken National Park Area Michellia Pamela Sanggor; Mercy Maggy Franky Rampengan; Helen Joan Lawalata; Anita Costanci Christine Tengker; Rievo Handry Djarang
Advances in Tropical Biodiversity and Environmental Sciences Vol. 8 No. 1 (2024): February 2024: Pages 1-57
Publisher : Institute for Research and Community Services Udayana University (LP2M Universitas Udayana)

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.24843/ATBES.2024.v08.i01.p02

Abstract

Sondaken Village has three mangrove zones, each with its own type of plant. The first zone, facing directly towards the sea, is dominated by Avicennia sp. The second zone, in the middle, is characterized by Rizophora sp. The third zone, closer to the land, is predominantly Bruguiera sp. Mangroves have different levels of growth, including seedling level, stake level, pole level, and tree level. The purpose of this study was to determine the types and growth levels of mangroves within its zonation in Sondaken Village, which is part of Bunaken National Park Area. This was done using exploratory and descriptive survey methods, by creating 3 plots in each zone from the edge to the center, with sizes of 10x10 m2, 5x5 m2, and 2x2 m2. The research found that mangrove in Sondaken Village consist of Avicennia sp, Rizophora sp, and Bruguiera sp, with the number of individuals per species being 124, 133, and 113 individuals respectively. Each type of mangrove has different growth levels and numbers.
Co-Authors Anita Costanci Christine Tengker Helen Joan Lawalata Iriani Setyawati Livana Dethris Rawung Meity Neltje Tanor Mercy Maggy Franky Rampengan Michellia Pamela Sanggor Nofia Poluan Rosenta Sipayung Wiesye Maya Selfia Nangoy