Table 1

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

Acclimatization Site


Inlet Stream West (normoxia)

Rwembaita Swamp (hypoxia)


Site of Origin


Parameters

Inlet Stream West

Rwembaita Swamp

Inlet Stream West

Rwembaita Swamp


Initial MT (g)a

2.26 ± 0.23 (21)

2.84 ± 0.16 (21)

2.56 ± 0.25 (21)

2.68 ± 0.12 (27)

Initial LS (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 MT (g)

2.17 ± 0.21 (21)

2.56 ± 0.17 (20)

2.45 ± 0.25 (21)

2.50 ± 0.11 (25)

Final LS (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)

GS (% d-1)b,c

-0.10 ± 0.02 (20)

-0.12 ± 0.01 (19)

-0.15 ± 0.02 (20)

-0.14 ± 0.01 (24)


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 (MT), standard length (LS), condition factor (K) were measured before and after the acclimatization treatment and specific growth rate (GS) was determined for the four week experiment. Data are shown as mean ± SEM with sample size in parentheses.

a Means were significantly different for fish from different sites of origin (P < 0.05).

b Means were significantly different for fish held at different acclimatization sites (P < 0.05).

c Means were significantly different among cages within acclimatization site (P < 0.05).

Martínez et al. BMC Ecology 2011 11:2   doi:10.1186/1472-6785-11-2

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