Preliminary study on impact of land use on fish fauna at Kenyana river and its tributaries, Mukah, Sarawak
The assessment of blackwater fish fauna available at Kenyana River and its tributaries was conducted from 19th March until 21 5t March 2013. The study area is a natural habitat for variety types of blackwater fish including the Asian Arowana. In order to protect this valuable fish and its habitat...
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| Format: | Thesis |
| Language: | English |
| Published: |
2013
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/10142/1/Hasanaliza.pdf |
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| Summary: | The assessment of blackwater fish fauna available at Kenyana River and its tributaries was
conducted from 19th March until 21 5t March 2013. The study area is a natural habitat for
variety types of blackwater fish including the Asian Arowana. In order to protect this
valuable fish and its habitat, the area has been focus to be protected by local authority and
it has been marked as sensitive area. Besides that, the area will become one of the ecotourism
destinations in Mukah area. The fish sampling were conducted in three days and
four sampling stations were chosen which located at Kenyana Lake Information Centre,
Kenyana River mouth, Kenyana River and Liwak River) Monofilament gill nets were used
(mesh size 5.1 cm, 7.6 cm and 10.1 cm) for fish sampl'fng. Each individual of fish caught
were measured for total length, standard length, fork length and body weight. A total of 41
individual of fish were caught with overall 7 blackwater fish species identified which
dominated by Pangasiidae (Pangasius macronemus) followed by Cyrprinidae
(Anemalichlhys apogon), Notopteridae (Noloplerus chUala), Bagridae (Hemibagrus
baramensis), Helostomatidae (Helosloma lemminckii), Osteoglossidae (Scleropages
jormosus) and Siluridae (Wallago leerii). Station I (Liwak River) shows the most
individual fish caught and the highest species diversity compared to other stations.
However, the Shannon-Wiener diversity index H' in Liwak River was low with H' value
0.65 and this illustrate that the fish in Kenyana River and its tributaries were in agitated
which might cause by the habitat disturbance in that area. As for species richness '0' in
Station 1 was greater with value 1.41 as compared to the other station. Though the
diversity index in Station I was high but the opposite result was shown for river water
quality. Based on Water Quality Index (WQI), Station I was categorized as Class IV
(polluted) and followed by Station 2 (Class III - polluted) and Station 3 (Class III - slightly
polluted). The high value of nutrient input at Station 1 and 2 might be due to surface runoff
that contained excessive fertilizer drained into the river during raining. Though the fish
population was high in Station I with low water quality, this condition might due to the
biasness in sampling time frame and method used. Nevertheless, the growing agricultural
land use area especially oil palm plantation which located at the middle and upper part of
the Kenyana Riv~r and its tributaries might influenced the river condition lead to habitat
disturbance. |
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