Database Penelitian P2L

Properti Nilai
Judul Paper presented at the International Workshop on the Anguilla eels
Penulis Haryani, G.S
Jenis Terbitan JURNAL
Nama Terbitan From Bioecology and Biodiversity Towards Biotechnology
Volume/No/Halaman   0/0/0
Kota Penerbit
Abstrak The Lake Poso system is located in Central Sulawesi, with a connection to the Tomini Bay by the Poso River. It has been known that five out of nine species of Indonesian tropical eel species were found at the mouth of Poso River, i.e.Anguilla marmorata, A. celebesensis, A. bicolor pacifica, A. interioris and A. borneensis, of which Anguilla marmorata is the most catched species and traded for decades. The physico-chemical condition of the 384 m deep Poso Lake as well as the invariably sloping of the Poso River indicate the slight eutrophic condition of the inland waters. Uncontrolled catch during downstream migration threatens most the population of the Anguillid silver eel in Lake Poso system, making the remarkable decrease of the production, from 41.5 tons in 1990 down to a mere 6.49 tons in 2009. Further decrease went on during 2010 – 2011 by 51.52 % of the production in the preceding years. The construction of hydropower plant in downstream of Poso River will likely add the potential hazard to the ever decreasing population of the Angullid. Spatial and temporal distribution of GSI (Gonado Somatic index) and HSI (Hepato Somatic Index) values are presented, featuring the gonads maturity and their stage of migratory path to the deep sea. The gonads condition of 38 eels (Anguilla marmorata) collected during different seasons from the Lake Poso, the midstream of Poso River and the estuary of Poso River were identified. Histological analyses of the sampled gonad of the Poso inland waters showed their early vitellogenic stage, typified by the GSI value range between 0.060 – 4.40%.. The high GSI values demonstrate the more temporally matured eel gonad development. However, a single low GSI value was found from a sample of the Poso estuary, indicating the likely yellow or anadromic en route eel catched in its lakeward migration. Four development stages of female gonads were found, i.e. chromatin nucleolar, perinucleolar, cortical alveoli and early vitellogenic. While the male gonads showed only pre-spermatogenic stage which contains only spermatogonia. The eel liver collected during April to September show a similar temporal gonads development pattern, as it shown by the HSI ranging from 0.63 – 1.97%.Both maturing male and female gonads were more than 70 cm long. Next stages to maturation will be reached during the downstream migration to the spawning area in deep sea. The prolific natural habitat of Poso inland waters no longer provides the ideal place for future availability of the eel stock. Some ways to conserve and mitigate the potential endangerment of this peculiar and highly valuable migratory fish for future sustainable production must be sought

 

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