Some Aspects Of The Biology And Population Dynamics Of The Dominant Fish Species In Kedungombo Reservoir, Central Java, Indonesia
The study was aimed to investigate some aspects of the biology and population dynamics of dominant fish species, namely Oreochromis mossambicus (Peter) , Puntius gonionotus (Bleeker) , Puntius bramoides (Cuvier & Valenciennes) , Mysracoleucus marginatus (Cuvier & Valenciennes) , and Chan...
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| Format: | Thesis |
| Language: | English English |
| Published: |
1993
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/11788/1/FPSS_1993_4_A.pdf |
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| Summary: | The study was aimed to investigate some aspects of the biology and
population dynamics of dominant fish species, namely Oreochromis
mossambicus (Peter) , Puntius gonionotus (Bleeker) , Puntius bramoides (Cuvier
& Valenciennes) , Mysracoleucus marginatus (Cuvier & Valenciennes) , and
Channa striatus Bloch in the Kedungombo Reservoir, Central Java, Indonesia.
Gillnet sampling in six sub-fishing areas of the reservoir once a month
for a 12 month period and catch assessment survey (CAS) at three fish landing
sites were carried out. Length-based methods for fish population study were
adopted. Results of the study showed that the dominant species were distributed
all over the reservoir, except C. striatus which were distributed in a restricted
area. The riverine species were concentrated in the upper portion of the
reservoir. The species richness and diversity of the fish community were high
in the upper portion of the reservoir. Based on the values of the index of
preponderance, O. mossambicus and M. marginatus were classified as
planktivores; P. gonionotus and P. bramoides as herbivores; and C. striatus
as a carnivore. Food competition occurred between O. mossambicus and M.
marginatus, and between P. gonionotus and P. bramoides. However, the food
competition among other species was considered low. O. mossambicus reproduced at intervals of about three months and their
reproduction occurred extensively during high water level . Reproduction of
P. gonionotus, P. bramoides and M. marginatus started from December until
March when the water level of the reservoir began to rise. In C. striatus
reproduction occurred during high water level . Fecundity of O. mossambicus,
P. gonionotus, P. bramoides, M. marginatus and C. striatus were between
178- 1,574; 25 ,980-86,916; 42 ,454-99 , 659; 4 , 702- 15 , 681 ; and 2 , 585- 12 , 880,
respectively . The fecundity was highly correlated with total length , body
weight, and gonad weight and it increased with the increase in total length ,
body weight and gonad weight. |
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