THE UTILIZATION OF Halymenia durvillaei TO SUPPORT THE MANAGEMENT OF Eucheuma spinosum SEAWEED FARMING IN GEGER COASTAL AREA, BALI

Seaweed farming activity is now facing some problems caused by pest fish herbivore and ice-ice disease. To solve those and improve our seaweed quality, seaweed production management requires some ecological technique improvements. The purpose of this study was to determine the functions of seaweed H. durvillaei for improving the production of the seaweed E. spinosum in the coastal area of Geger Beach, Peminge Village, South Kuta subdistrict, Badung regency, Bali. The measured data includes parameter of weight, length and water quality. Data was measured every 10 days for up to 40 days. The best growth result was shown by the model of E. spinosum that were fenced by H. durvillaei of 456 g for E. spinosum. H. durvillaei showed good impact on increasing the production of E. spinosum up to 68.7% compared to the control. Water quality conditions on seaweed culture was good with temperature ranged from 27.7 to 30.1°C, salinity from 30 to 32.3 ppt, DO from 3.9 to 5.5 ppm, pH from 7.9 to 8.4, current 0.1 to 0.2 m/s, and clearness of 100%.

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KARAKTERISTIK DAN KESESUAIAN PERAIRAN UNTUK BUDIDAYA RUMPUT LAUT DI KABUPATEN KEPULAUAN SANGIHE, SULAWESI UTARA

Jurnal Riset Akuakultur ◽

10.15578/jra.12.2.2017.187-196 ◽

2017 ◽

Vol 12 (2) ◽

pp. 187

Author(s):

Andi Akhmad Mustafa ◽

Tarunamulia Tarunamulia ◽

Hasnawi Hasnawi ◽

I Nyoman Radiarta

Keyword(s):

Water Quality ◽

Carrying Capacity ◽

Kappaphycus Alvarezii ◽

Coastal Areas ◽

Quality Data ◽

Water Quality Data ◽

Seaweed Farming ◽

Long Line ◽

Surrounding Areas ◽

Seaweed Culture

Kabupaten Kepulauan Sangihe dengantiga pulau terdepannya memiliki potensi untuk pengembangan budidaya rumput laut (Kappaphycus alvarezii), namun belum tersedia data kondisi perairannya. Kajian bertujuan untuk mengetahui karakteristik, kesesuaian, dan daya dukung perairan untuk budidaya rumput laut di kawasan pesisir Kabupaten Kepulauan Sangihe. Data kondisi perairan yang dikumpulkan berupa lingkungan fisik dan kualitas air. Analisis dengan weighted linear combinationdalam SIG dilakukan untuk penentuan kesesuaian perairan danbesarnya kapasitas perairan digunakan untuk penentuan daya dukung perairan. Hasil kajian menunjukkan bahwa, karakteristik perairan Kabupaten Kepulauan Sangihe dapat mendukung usaha budidaya rumput laut, namun kedalaman perairan yang relatif dangkal dan adanya alur pelayaran yang menjadi faktor pembatas dalam kesesuaian lahan untuk budidaya rumput laut. Dari 4.839,36 ha kawasan pesisir yang dikaji di Teluk Talengen (Kecamatan Tabukan Tengah), Teluk Manalu (Kecamatan Tabukan Selatan), dan Teluk Dagho dan sekitarnya (Kecamatan Tamako dan Manganitu Selatan) dijumpai kawasan pesisir seluas 181,80 ha yang tergolong sangat sesuai; 852,82 ha yang tergolong cukup sesuai; 3.633,75 ha yang tergolong kurang sesuai; dan 179,99 ha yang tergolong tidak sesuai untuk budidaya rumput laut metoda tali panjang. Budidaya rumput laut metoda tali panjang di Kabupaten Kepulauan Sangihe dapat dilakukan di Teluk Talengen, Teluk Manalu, dan Teluk Dagho dan sekitarnya dengan pengembangan kawasan maksimal masing-masing seluas 324; 559; dan 1.171 ha yang dapat digunakan untuk masing-masing 1.296, 2.236, dan 4.684 unit rakit budidaya rumput laut berukuran 50 x 50 m. Sangihe Archipelago Regency with its three outlying islands has the potential for seaweed farming development (Kappaphycus alvarezii), regrettably reliable water quality data are scarcely available in this region. The study was aimed to determine the characteristics, suitability, and carrying capacity of waters for seaweed farming in the coastal areas of Sangihe Archipelago Regency. The observed environmental quality of coastal waters included physical environment and water quality. A weighted linear combination in a GIS environment method was applied to determine the suitability of waters and the capacity of coastal water to accommodate the maximum surface area of the farm was used to determine the carrying capacity of waters. The results of the study indicated that the characteristics of waters in Sangihe Archipelago Regency provide suitable environment for seaweed culture, however the relatively shallow waters and the existence of the shipping lanes in the study region can become major limiting factors for seaweed culture and development. Of 4,839.36 hectares of the coastal areas studied in Talengen Bay (Tabukan Tengah Subdistrict), Manalu Bay (South Tabukan Subdistrict), and Dagho Bay and surrounding areas (Tamako and Manganitu Selatan Subdistricts), a total of 181.80 ha were classified as very suitable; 852.82 ha were moderately suitable; 3,633.75 ha were less suitable; and 179.99 ha were not suitable for seaweed long-line culture method. Further analysis showed that seaweed culture of long-line method can be effectively practiced in Talengen Bay, Manalu Bay, and Dagho Bay and surrounding areas with the maximum development areas of 324, 559, and 1,171 ha respectively of which can be used for allocating 1,296, 2,236, and 4,684 culture raft units respectively, with the size of 50 x 50 m per unit.

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Impact of Water Quality Detorioration in Mangrove Forest in Semarang Coastal Area

Indonesian Journal of Limnology ◽

10.51264/inajl.v2i2.20 ◽

2021 ◽

Vol 2 (2) ◽

pp. 37-48

Author(s):

Kenanga Sari ◽

Tri Retnaningsih Soeprobowati

Keyword(s):

Water Quality ◽

Coastal Area ◽

Environmental Changes ◽

Principal Component ◽

Quality Standard ◽

Quality Data ◽

Physical Parameters ◽

Water Quality Data ◽

Total N ◽

The North

The fast-growing development and industrialization have caused various impacts on nature including heavy metal pollution, especially in the coastal area. Tambakredjo, located in the North Semarang city, is home to a large number of mangrove and animal species. Therefore, water quality is important. This study was conducted to analyze water quality in the coastal area of Tambakredjo based on physical and chemical measurements. Water quality data were collected from different sites. Physical parameters (temperature, pH, DO, EC, TDS, ORP and salinity) and chemical parameters (Total N, Total P, Pb, Cr, Cd) were observed. Multivariate statistical techniques, including Principal Component Analysis (PCA), was applied to evaluate water quality. The results showed first principal component is 76.27%, where the highest conductivity, total dissolved solids and salinity are associated with site 1. Content of Lead 1.289 ppm, Cadmium 0.021 ppm, and Chromium 0.352 ppm exceeds the water quality standard PP. No. 82/2001. It indicated that Site 1 was characterized as the most heavily polluted site because the location received pollutants from rivers and oceans. This study also examined the short-term changes of the mangrove-covered area at the side of Banjir Kanal Timur using historical map satellite images. The results show that mangrove coverage in Tambakredjo near the aquaculture area had decreased from 1,875m2 to 1,401m2. Meanwhile, on the other site, the mangrove planting effort as a restoration program is carried out, especially in the estuary of Banjir Kanal Timur to anticipate more environmental changes.

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