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All Journal Jurnal Tropical Aquatic Sciences
Akhmad Rafi’i
Staf Pengajar Jurusan Manajemen Sumberdaya Perairan, Universitas Mulawarman
Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Chemistry Energy Physics

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IDENTIFIKASI SAMPAH LAUT MAKRO DI PANTAI LE GRANDEUR KOTA BALIKPAPAN KALIMANTAN TIMUR Ardan Ardan; Akhmad Rafi’i; Ghitarina Ghitarina
Jurnal Tropical Aquatic Sciences Vol. 1 No. 2 (2022): Jurnal Tropical Aquatic Sciences
Publisher : Department of Aquatic Resources Management, Faculty of Fisheries and Marine Science, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/tas.v1i2.635

Abstract

There is a lot of waste that is difficult to decompose and accumulates in nature, especially at the coastal and ocean, resulting in environment disturbance. This study was aimed to identify macro-size marine debris collected from Le Grandeur beach, Balikpapan City, East Kalimantan. A 100 x 20 m transect line was set at the beach. Each transect equipped with 5x5 m subtransect where the macro-debris was sampled. All debris in subtransect were collected and were cleaned prior sorted and grouped based on their categories namely plastic, glass, metal, rubber, wood and other types. Samples from each type were counted and measured in weight. Based on the results of the study, samples of macro marine debris collected at the study site were plastic, glass, metal, rubber, wood and others with a total debris of 435 items and total weight of 2,263.772 g/m2. Total density of waste is 86.6 particles/m2 with the percentage of each waste being 45% plastic, 0% glass, 2% metal, 2% rubber, 2% wood and 49% others.
ASPEK BIOLOGI KEONG MACAN (Babylonia spirata, L) YANG TERTANGKAP DI SEKITAR PERAIRAN MUARA SEMBILANG, KECAMATAN SAMBOJA, KABUPATEN KUTAI KARTANEGARA, KALIMANTAN TIMUR Fitria Melani; Mohammad Mustakim; Akhmad Rafi’i
Jurnal Tropical Aquatic Sciences Vol. 1 No. 2 (2022): Jurnal Tropical Aquatic Sciences
Publisher : Department of Aquatic Resources Management, Faculty of Fisheries and Marine Science, Mulawarman University

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.30872/tas.v1i2.646

Abstract

Around Muara Sembilang Waters, the babylon snail population is decreasing. Efforts to manage is an alternative that can be taken in meeting local and export needs by knowing various biological aspects of which includes the relationship length and weight, condition factors, sex ratio, level of gonadal maturity (TKG), gonadal maturity index (GIC), and the ratio of the weight of the meat divided by the total weight by the IKG value. This research was conducted in October – December 2021 using jodang fishing gear. The research method used is purposive sampling. Based on the T test on all samples, the calculated T value (0.71) is smaller than T table (1.969), this indicates that the b value is significantly different from 3 where the growth of the babylon snail is negative allometric which means the length increase is faster than the increase in weight. The sex ratio of babylon snails is not balanced and is dominated by female snails. The TKG and IKG values ​​of the dominant female babylon snails were higher than the male snail. Babylon snails experienced two cycles of gonadal maturity, the first occurred in the 39.11 - 39.51 mm size group with an IKG value of 12.32% and in the 43.31 - 43.71 size group with an IKG value of 11.76%. Allegedly in this size group is the condition of the parent who is ready to experience spawning.
Co-Authors Ardan Ardan Fatimah Tulzuhrah Fitria Melani Ghitarina Ghitarina Mohammad Mustakim Ristiana Eryati