Development of the silver eel (Anguilla marmorata) gonad during downstream migration in the Lake Poso system, Central Sulawesi

Gadis Sri Haryani,Foni Agus Setiawan,Angga Dwinovantyo,Mohammad Riyanto,Fauzan Ali,Fachmijany Sulawesty,Eva Nafisyah,Octavianto Samir,Endra Triwisesa,Lukman Lukman ,Li Wang ,Hardianto Wibowo ,Triyanto Triyanto

doi:10.1051/e3sconf/202132201012

Gadis Sri Haryani, Foni Agus Setiawan + Show 11 more

Open Access

https://doi.org/10.1051/e3sconf/202132201012

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Abstract

The Lake Poso system is located in Central Sulawesi and is connected to the Tomini Bay by the Poso River. It is known that five out of nine Indonesian eel species were found at the Poso River. Anguilla marmorata is the most caught species. However, uncontrolled catching during downstream migration and the construction of a hydropower plant threaten the silver eel in the Lake Poso system. Research on silver eel (A. marmorata) in Lake Poso was conducted to determine and compare the condition of gonad development as part of the reproductive process. This represents essential information in eel fisheries management in Lake Poso. The eels were collected through bamboo traps (waya masapi). The present study calculates the GSI and HSI values, and histological analyses characterize the gonad. The GSI of eel ranges from 1.95 to 5.69%, and the HSI value ranges from 0.83 to 1.16%. Histological observation showed that eels from Tentena (Lake Poso outlet) and from the estuary of Poso River have ovaries in the early vitellogenic stage (III) and the vitellogenic stage (IV).

Highlights

Lake Poso is located in Central Sulawesi and is connected to the Tomini Bay by the Poso River
Five of the nine (9) species of Indonesian freshwater eel are found at the mouth of Poso River: Anguilla marmorata, A. celebesensis, A. bicolor pacifica, A. interioris and, A. borneensis, of which A. marmorata is the most-caught species and has been traded for decades [2]
In the other study, we found a fisherman caught an eel in Lake Poso with 22.5 kg of body weight

Summary

Introduction

Lake Poso is located in Central Sulawesi and is connected to the Tomini Bay by the Poso River. Lake Poso is one of Indonesia's 15 priority lakes that must be appropriately managed [1]. One of the essential natural resources of Lake Poso is the freshwater eel. Five of the nine (9) species of Indonesian freshwater eel are found at the mouth of Poso River: Anguilla marmorata, A. celebesensis, A. bicolor pacifica, A. interioris and, A. borneensis, of which A. marmorata is the most-caught species and has been traded for decades [2]. The characteristics of the aquatic habitats of Sulawesi support the presence of A. marmorata [4]

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Conclusion