Inshore migration of tropical glass eels (Anguilla spp.) in Lambeso River, Aceh Jaya District, Aceh Province, Indonesia

Zainal A Muchlisin,Dedi F Putra,Abdullah A Muhammadar,Maulidin Maulidin

doi:10.13170/ajas.1.2.5304

Abstract

The objective of the present study was to evaluate the migration time of glass eels (Anguilla spp.) in the estuary of Lambeuso River, Aceh Jaya District, Indonesia. The survey was done in March and June 2015. The sampling location was determined based on an initial survey during February 2015 by considering the river condition. Based on initial survey there are no glass eels were recorded during noon time, and therefore the sampling was focused at night. The sampling was done four times a month (weekly basis) for three months (12 times in total) using trap nets based on Hijri Calendar. The trap was settled up to opposite direction of tide (seaward) from 18.00 PM to 06.00 AM and the catches glass eels were monitoring one-hour interval. A total of 131 glass eels were sampled during the study, where the samples were only caught on first (new month) and fourth week (old month) base on Hijri Calender during spring tide and no glass eels were sampled during second and third weeks. It was concluded that the migration time of the glass eels (Anguilla spp.) in Lambeso Rivers is during the dark moon at the new and old month of Hijri Calendar

Highlights

Tropical freshwater eels (Anguilla spp.) or locally known ileah is one of the high economic value fish, this species occurs in some areas of Aceh Province
According to Sugeha and Genisa (2015), the differences in environmental conditions and duration of glass eel migration differ between one species to another led to the difference in size when they arrived in the estuary area
The objective of the initial sampling was to determine the migration time in general, whether they migrate during the day or night, for this purposes sampling was done for 24 hours and the trap was monitored at one-hour interval

Summary

Introduction

Tropical freshwater eels (Anguilla spp.) or locally known ileah is one of the high economic value fish, this species occurs in some areas of Aceh Province. According to Muchlisin (2013) eels have potency as a fish target for the aquaculture industry. The market demand for eels is increasing over the years, for example, in 1995 the production of eels was 20,5000 tons or equivalent to 3.1 billion USD, this is mostly from culture (Rovara et al, 2007), but the fish larvae (glass eels) were collected from wild. According to Aoyama et al (2015) that the less supply of the glass eels for aquaculture have significantly impacted the eel industries in East Asia and have triggered in increasing economic interest in eels species. According to Sugeha and Genisa (2015), the differences in environmental conditions and duration of glass eel migration differ between one species to another led to the difference in size when they arrived in the estuary area

Objectives

Methods

Results