Serangan Island is a small island located approximately 5 km in south of Denpasar City and has a maximum length of 2.9 km and a width of 1 km which is administratively as part of the Denpasar City, Bali Province. Serangan Island is widely used for aquaculture and fisheries activities, moreover Serangan is also used as tourism activities, transportation routes, the harbour of ships and residences which may have impact on the aquatic ecosystem balance. The purpose of this research is to know how the structure of macrozoobenthos community and the water quality condition in Serangan Island. The research was conducted on February to March 2017 by using descriptive quantitative method in 3 research stasions. The result showed that there are 23 species of macrozoobenthos that consists of 7 classes, namely Gastropods, Bivalve, Crustacea, Echinoidea, Asteroidea, Ophiuroidea, and Holothuroidea. The highest total of abundance was at station 1 about 46,8 ind/m 2 . The diversity index ranged from 0,66-2,14 and the equibility index ranged from 0,60-0,81, while the dominance index ranged from 0,17-0,63. Based on the criteria of the Shanon-Wiener diversity index (H'), the diversity index at station 1 and 2 indicates moderate diversity which has moderate species distribution and moderately polluted waters, whereas the value of the diversity index at station 3 indicates that the diversity in this stasion is low, showed by low abundance of species, low stability of the community and severe polluted condition. AbstrakPulau Serangan merupakan pulau kecil yang terletak 5 km di sebelah selatan Kota Denpasar dan memiliki panjang maksimum 2,9 km serta lebar 1 km yang secara administratif pulau ini masih termasuk wilayah Kota Denpasar, Provinsi Bali. Pulau Serangan banyak dimanfaatkan untuk kegiatan perikanan budidaya dan perikanan tangkap, selain itu perairan Serangan juga dimanfaatkan sebagai kegiatan pariwisata, jalur transportasi kapal, pendaratan kapal serta pemukiman berpotensi menyebabkan terganggunya keseimbangan ekosistem perairan. Tujuan dari penelitian ini adalah untuk mengetahui struktur komunitas makrozoobenthos dan status kondisi kualitas air Pulau Serangan. Penelitian ini dilaksanakan pada bulan Pebruari-Maret 2017. Penelitian menggunakan metode deskriptif kuantitatif. Berdasarkan hasil penelitian yang dilaksanakan pada 3 stasiun didapatkan makrozoobenthos sebanyak 23 spesies yang terdiri 7 kelas, yaitu kelas Gastropoda, Pelecypoda, Crustacea, Echinoidea, Asteroidea, Ophiuroidea, Holothuroidea. Total kelimpahan tertinggi terdapat pada stasiun 1 yaitu 46,8 ind/m 2 . Indeks keanekaragaman berkisar 0,66-2,14 dan indeks keseragaman berkisar 0,60-0,81, sedangkan indeks dominansi berkisar 0,17-0,63. Berdasarakan kriteria indeks keanekaragaman Shanon-Wiener (H'), indeks keanekaragaman pada stasiun 1 dan 2 mengindikasikan keanekaragaman sedang yaitu penyebaran jumlah individu sedang dan keadaan perairan tercemar sedang, sedangkan nilai indeks keanekaragaman pada stasiun 3 mengindikasikan keanekaragaman rendah yaitu jumlah individu ...
Estuary ecosystem has an important role in supporting the life of shrimp. High productivity and the availability of natural food in the estuary ecosystem, will indirectly affect the growth of shrimp. Penaeus monodon and Penaeus merguiensis were two species of shrimp that had economic value with high demand. The purpose of this study was to determine the biological aspects of Penaeus monodon and Penaeus merguiensis shrimp at estuary of Tukad Aya, Bali. Data collection was carried out in February-March 2019 using quantitative descriptive research methods. The determination of the research station was done by purposive sampling. The results showed the total number of shrimps were caught 1,756 individuals, which consist of Penaeus monodon 151 individuals, Penaeus merguiensis 224 individuals and 1,325 individuals of other shrimp. The composition of Penaeus monodon (8.6%) was less than Penaeus merguiensis (12.76%). Shrimp length measurements were divided into 9 groups with a range of values of 55.15-189.95 mm in Penaeus monodon and 31.3-140.1 mm in Penaeus merguiensis. The results of the length and the weight regression in both species of shrimp obtained the value of b <3 so that the growth pattern of shrimp was categorized as negative allometric where length growth was faster than weight gain.
Lovina Beach is one of the beaches visited by many foreign and domestic tourists. Lovina Beach has a tourism spot and a vast area of marine biota cultivation. Life of biota in the waters of Lovina Beach is affected by conditions of beach waters. The research purpose was to know the correlation between waters quality and plankton in Lovina Beach by using observation method. The research was done on February until March 2017. Species of fitoplankton species from all three stations was dominated by Lyngbya sp. with abundance of 78 ind/l. The average value of the phytoplankton diversity index found was 1.7706. The average value of phytoplankton uniformity index is 0.9882 while the value of phytoplankton dominance index is 0.1737. The average value of the zooplankton diversity index found is 1.7311. The average value of the zooplankton uniformity index is 0.8896 while the zooplankton dominance index value is 0.2125. The result of the measurement of water quality is temperature parameter in Lovina Beach ranged from 27.6 - 28.9 0C, brightness ranged between 4.7 - 6 m, salinity of 25.3 - 27 ppt, DO (Dissolved Oxygen) ranged between 4 - 4 , 7 Mg / L, the pH ranged from 8.5 to 8.6, the nitrate ranged from 0.0081-00087 Mg/L and the phosphate ranged from 0.016 to 0.027 Mg / L. So, it can be concluded that the waters of Lovina Beach has the highest abundance of plankton that is the type of zooplankton, the level of plankton community structure in Lovina Beach waters is moderate.ppt, DO (Dissolved Oxygen) 4 – 4,3 Mg/l, pH 8,5 – 8,6, nitrate 0,0081 – 0,0087 Mg/l and phosphate 0,016 – 0,027 Mg/L. The structure of plankton community in Lovina coastal according of phytoplankton abundance categorized in oligotropic, while according of zooplankton abundance categorized in moderate (mesotropic).
The Syngnathidae reef fish belongs to the vulnerable category of CITES due to the decrease in its original habitat. This is due to the high activity of predatory and utilization as raw material of traditional medicine. This study aims to study the ecological conditions including the distribution and abundance of reef fish Syngnathidae in the waters of the Blue Lagoon Karangasem waters and study the physical condition of its aquatic chemistry. This research was conducted from August to October 2017. The determination of research station was done based on Purposive sampling methods. For data retrieval of the Syngnathidae reef fish using square squares method with size 10x10 m in each sampling location. The result of this research is the emergence of species of reef fish Syngnathidae ranged from 1-4 individual at each location of observation. The results show that the ecological condition of the Syngnathidae reef fish in the Blue Lagoon coastal waters is of concern, this refers to the distribution and abundance of the limited reef fish Syngnathidae in its distribution. On the other hand, analysis of physical chemistry data shows that the condition of Blue Lagoon coastal waters tends to be stable. Measurement of water physics-chemical parameters obtained result of temperature measurement range 28-29oC, salinity 27-29 ppt, pH 7.08-7,89 and DO 7-7,75 mg/l. The result of physicochemical parameter measurement is related to the quality standard of Kep.Men.LH No.51 about the quality of the waters for marine biota was good for the existence of Syngnathidae reef fish. In general, the aquatic chemical physics conditions have a significant influence on the emergence of reef fish Syngnathidae found in stations 1 and III but not found in station II located in the middle of the waters between stations I and III.
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