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Effect of temperature on oocyte development of Oreochromis karongae (Trewavas, 1941)

Effect of temperature on oocyte development of Oreochromis karongae (Trewavas, 1941) Summary Oreochromis karongae (Trewavas, 1941) is one of the indigenous Tilapia species exhibiting favourable traits for aquaculture in Malawi. However, commercial fingerling production is still a problem. An experiment was carried out to investigate the effect of raising ambient temperature to 27°C on oocyte development of the fish. Female O. karongae were reared under two temperature regimes: at room (20.3 ± 0.8°C) and at raised (26.5 ± 0.5°C) temperature for 90 days. Changes in gonadosomatic index (GSI) and oocyte developmental stages were determined every 45 days. Fish samples from the pond (22.5 ± 3.4°C) from which experimental fish were collected were used for comparison. Results showed that raising temperature to 26.5 ± 0.5°C significantly enhanced oocyte development. Higher GSIs (P ≤ 0.05) were obtained after 45 and 90 days in fish cultured at elevated temperature (0.82 ± 0.66 and 1.13 ± 0.47%, respectively) than at room temperature (0.06 ± 0.03 and 0.37 ± 0.05 %, respectively). GSI of fish samples from the pond were not different from that of fish from room temperature. After 45 days, relative frequency of mature oocytes was higher (P ≤ 0.05) in fish from raised temperature (60.42 ± 3.63%) than in fish from room (1.76 ± 0.84%) and pond temperature (2.43 ± 1.38%). After 90 days, the frequency of mature oocytes in fish from raised temperature was not different from pond fish (8.68 ± 2.40 and 10.99 ± 3.41%, respectively). Fish from room temperature had a low (P ≤ 0.05) frequency of mature oocytes (3.12 ± 2.03%). The results suggest that O. karongae has the potential to spawn throughout the year when the temperature is manipulated. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Applied Ichthyology Wiley

Effect of temperature on oocyte development of Oreochromis karongae (Trewavas, 1941)

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References (8)

Publisher
Wiley
Copyright
Copyright © 2004 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0175-8659
eISSN
1439-0426
DOI
10.1111/j.1439-0426.2003.00533.x
Publisher site
See Article on Publisher Site

Abstract

Summary Oreochromis karongae (Trewavas, 1941) is one of the indigenous Tilapia species exhibiting favourable traits for aquaculture in Malawi. However, commercial fingerling production is still a problem. An experiment was carried out to investigate the effect of raising ambient temperature to 27°C on oocyte development of the fish. Female O. karongae were reared under two temperature regimes: at room (20.3 ± 0.8°C) and at raised (26.5 ± 0.5°C) temperature for 90 days. Changes in gonadosomatic index (GSI) and oocyte developmental stages were determined every 45 days. Fish samples from the pond (22.5 ± 3.4°C) from which experimental fish were collected were used for comparison. Results showed that raising temperature to 26.5 ± 0.5°C significantly enhanced oocyte development. Higher GSIs (P ≤ 0.05) were obtained after 45 and 90 days in fish cultured at elevated temperature (0.82 ± 0.66 and 1.13 ± 0.47%, respectively) than at room temperature (0.06 ± 0.03 and 0.37 ± 0.05 %, respectively). GSI of fish samples from the pond were not different from that of fish from room temperature. After 45 days, relative frequency of mature oocytes was higher (P ≤ 0.05) in fish from raised temperature (60.42 ± 3.63%) than in fish from room (1.76 ± 0.84%) and pond temperature (2.43 ± 1.38%). After 90 days, the frequency of mature oocytes in fish from raised temperature was not different from pond fish (8.68 ± 2.40 and 10.99 ± 3.41%, respectively). Fish from room temperature had a low (P ≤ 0.05) frequency of mature oocytes (3.12 ± 2.03%). The results suggest that O. karongae has the potential to spawn throughout the year when the temperature is manipulated.

Journal

Journal of Applied IchthyologyWiley

Published: Apr 1, 2004

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