Diversity Of Freshwater Fishes In Aceh Province With Emphasis On Several Biological Aspects Of The Depik (Rasbora tawarensis) An Endemic Species In Lake Laut Tawar
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Date
2010-12
Authors
Zainal Abidin, Muchlisin
Journal Title
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Publisher
Universiti Sains Malaysia
Abstract
Intensive survey of fish biodiversity was conducted for six months in 17 locations covering the five regions of Aceh Province to build a comprehensive database in this area. A total of 711 fishes belonging to 114 species,o 69 genera, 41 families and 12 orders were recorded in this study. Cyprinidae was the predominant freshwater fish group in the Aceh Province. The Lembang River had the highest species richness and diversity index in the Province. Regionally, the diversity index was highest in the northern region. However, the highest species richness was found in the western region. Six species i.e. Puntius brevis, Channa striata, Anguilla bicolor, Anabas testudineus, Clarias teijsmani, and Hampala macrolepidota were the most widely distributed. The evaluation of conservation status showed that 10 species were threatened and of these, two species (Poropuntius tawarensis and Rasbora tawarensis) were endemic while 9 species were introduced. Based on priority evaluation, this study was focused in Lake Laut Tawar and R. tawarensis as a target species in particular and genus Rasbora in general.
Based on examination of the morphometric approaches (traditional morphometric, truss network morphometric and meristic data) and supported by genetic (based on the barcoding COI gene) data, it is concluded that there were only two valid species of Rasbora were present in the lake, where Eas and Depik
were shown to be the same species, Rasbora tawarensis and the other, Relo was probably a cryptic species (Rasbora sp.). The COI gene also generally validated the taxonomic status of the 14 species in the lake in agreement with morphological classification. A total of 31 haplotypes sequences were produced where Puntius brevis and Poropuntius tawarensis were found to be very closely related.
A length-weight relationships and condition factors study on 1,159 R. tawarensis and 626 P. tawarensis revealed that in general, the size (length and weight) of P. tawarensis was significantly higher than R. tawarensis. However, both species showed an allometric negative growth pattern. The condition factor values of both species were moderate.
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Keywords
Diversity of freshwater fishes in Aceh province with emphasis , on several biological aspects of the depik