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Full Length Research Paper
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The effects of water type
on growth, survival and condition of Poecilia velifera
Semra Küçük
Department of Fisheries, Faculty of Agriculture, Adnan
Menderes University, 09100, Aydin, Turkey. E-mail:
skucuk@adu.edu.tr. Tel: 90-256-7727022.
Fax:
90-256-7727233.
Abbreviations: W1, Water type 1; W2,
water type 2; T, temperature; DG, daily
growth; FCR, feed conversion ratio; FI, food
intake; Wi, initial mean body weights;
Wf, final mean body weights; WG,
weight gain.
Accepted
19 January, 2010 |
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Abstract |
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Seven
growth periods were completed on juvenile velifera (Poecilia
velifera) for a period of 2 weeks to determine the
optimal water type for best daily growth, food intake, feed
conversion ratio, weight gain, survival and condition
factor. Four water types (T1 = 25°C W1, T2 =
30°C W1, T3 = 25°C W2, T4 = 30°C W2)
were used to grow up P. velifera for 105 days. In
each aquarium, fifteen individuals were stocked and fed to
satiation twice a day. Bulk weight of each group was
measured 2 weeks interval. Growth rate did not increase
with water temperature. Water quality made difference. Fish
with W1 grew better than with W2. Fish
in T1 had the best growth (daily growth 10.37 mg/day). Food
intake was the highest in T1. Feed conversion ratio did not
differ significantly among groups. Survival was low among 4
groups (T1, T2, T3, and T4 were 55.6, 53.3, 53.3, and 33.3%,
respectively), but not significant. Condition factor was the
best in T1 (1.61).
Key
words:
Water type, Poecilia velifera, growth, temperature,
survival. |
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