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Table 1 Morphological traits of the African cyprinid Barbus neumayeri collected from and acclimatized to field sites differing in dissolved oxygen content.

From: Oxygen limitation and tissue metabolic potential of the African fish Barbus neumayeri: roles of native habitat and acclimatization

 

Acclimatization Site

 

Inlet Stream West (normoxia)

Rwembaita Swamp (hypoxia)

 

Site of Origin

Parameters

Inlet Stream West

Rwembaita Swamp

Inlet Stream West

Rwembaita Swamp

Initial M T (g) a

2.26 ± 0.23 (21)

2.84 ± 0.16 (21)

2.56 ± 0.25 (21)

2.68 ± 0.12 (27)

Initial L S (mm) a

49.1 ± 1.7 (21)

53.4 ± 1.0 (21)

51.8 ± 1.89 (21)

53.0 ± 0.9 (27)

Initial K

1.79 ± 0.03 (21)

1.82 ± 0.03 (21)

1.71 ± 0.02 (21)

1.77 ± 0.03 (27)

Final M T (g)

2.17 ± 0.21 (21)

2.56 ± 0.17 (20)

2.45 ± 0.25 (21)

2.50 ± 0.11 (25)

Final L S (mm)

48.4 ± 1.7 (21)

52.1 ± 1.0 (21)

50.2 ± 1.99 (20)

51.4 ± 1.0 (24)

Final K

1.79 ± 0.03 (21)

1.78 ± 0.05 (20)

1.79 ± 0.05 (20)

1.84 ± 0.04 (24)

G S (% d -1 ) b,c

-0.10 ± 0.02 (20)

-0.12 ± 0.01 (19)

-0.15 ± 0.02 (20)

-0.14 ± 0.01 (24)

  1. Barbus neumayeri were collected from Inlet Stream West (DO = 5.4 mg O2 L-1) and Rwembaita Swamp (DO = 1.1 mg O2 L-1) and held under a reciprocal acclimatization treatment for four weeks. Total mass (M T ), standard length (L S ), condition factor (K) were measured before and after the acclimatization treatment and specific growth rate (G S ) was determined for the four week experiment. Data are shown as mean ± SEM with sample size in parentheses.
  2. aMeans were significantly different for fish from different sites of origin (P < 0.05).
  3. bMeans were significantly different for fish held at different acclimatization sites (P < 0.05).
  4. cMeans were significantly different among cages within acclimatization site (P < 0.05).
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