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Diversity of Brackish Water Fish in Several Rivers in Babulu Laut Village, Sub-district Babulu, District Penajam Paser Utara (PPU), East Kalimantan

Lariman, Andy Triawan Muhtazam, Dan Sus Trimurti
Department of Biology, Faculty of Mathematics and Natural Sciences, Mulawarman University, Samarinda, East Kalimantan, Indonesia
Received: 03 February 2023; Accepted: 16 February 2023; Published: 15 March 2023

Abstract: – Babulu Laut Village is an area where there is a brackish water river that is used by local residents as a source of water for pond cultivation. Until now, there is no information about the types of brackish water fish found in the river. This research aims to find out the diversity of brackish water fish in several rivers in Babulu Laut village, sub-district Babulu, district Penajam Paser Utara (PPU), East Kalimantan. This research conducted on October-December 2021. Sampling used purposive sampling and random sampling methods at three research stations. Fish sampling conducted by installing gill nets for 2 hours with checking every 30 minutes and using fishing rods for 1-2 hours. The results of the research was found 17 species of fish which represented 12 families among others Otek fish (Ariidae), Barokang fish (Ariidae), Keting fish (Ariidae), Terkulu fish (Carangidae), Bandeng fish (Chanidae), Bulu Ayam fish (Engraulidae), Teri fish (Engraulidae), Bungo fish (Gobiidae), Gerot fish (Haemulidae), Arut fish (Haemulidae), Kakap Merah fish (Lutjanidae), Bulan-Bulan fish (Megalopidae), Belanak fish (Mugilidae), Kiper fish (Scatophagidae), Gelama fish (Scianidae), Tetet fish (Scianidae), and Sumpit fish (Toxotidae). The results of the diversity index of fish species in the Babulu Laut Village River were classified as moderate with a diversity index (H’) value of 2.26, an evenness index of 0.80 and a dominance index of 0.16.

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Keywords: Diversity of types, fish, river.

I. Introduction

Indonesia has around 8.500 species of fish (Supriatna, 2008) including 800 species of fish in fresh and brackish waters. In Kalimantan alone there are around 394 species of fish with 149 endemic fish species (Ajai, 2020). However, this number may change as a result of the large number of exploitations carried out, damage, decreased quality of fish habitat and the conversion of water bodies to other uses are the main factors causing fish populations to continue to decline (Haryono, 2017).

Babulu Laut Village geographically is one of the villages in Sub-district Babulu, District Penajam Paser Utara, East Kalimantan with a total area of 129.990 Ha (Kurniawan, 2008). This village is a strategic place in fisheries production activities such as pond cultivation with a pond area up to 5.000 hectares (Rahmani, 2018). In this village there is a brackish water river which is influenced by the tidal cycle of sea water which is used by local residents as a source of water for pond cultivation activities.

There is no complete information about the types of brackish water fish found in the river, so this research aims to determine the diversity of brackish water fish species in the river in Babulu Laut Village

II. Research Methods

This research was conducted using purposive sampling and random sampling methods at 3 sampling stations. Station I is the estuary of the Babulu Laut River, geographically located at 1˚31’22″S and 116˚31’57″E. Station II is the estuary of the Sarang Elang Kecil River, geographically located at 1˚32’07″S and 116˚32’12″E. Station III is the estuary of the Sarang Elang Besar River, geographically located at 1˚32’37″S and 116˚32’25″E.