The Company of Biologists

Table 1.

Morphometric parameters of the gills, and ionoregulatory status of plasma ion concentrations of the scaleless carp in normoxic and hypoxic water

		Hypoxia							Recovery after hypoxia
	Normoxia	4 h	8 h	12 h	24 h	6 h	12 h
Gill morphology (μm)
Protruding lamellar height	78.9±1.7	80.2±1.8	89.1±1.4^*	100.6±2.2^*	107.2±1.6^*	102.3±2.0^*	92.4±2.3^*
Protruding lamellar basal length	350.8±6.7	356.5±9.0	368.8±9.3^*	389.0±10.5^*	412.3±11.6^*	388.4±7.1^*	364.7±8.5^*
Lamellar thickness	11.8±0.5	11.8±0.9	10.6±0.6^*	9.1±0.3^*	8.4±0.4^*	10.6±0.8^*	11.2±0.4^*
Number of nuclei in interlamellar cell mass	17.5±0.6	–	–	12.7±0.5^*	10.4±0.2^*	10.9±0.4^*	12.2±0.3^*
Plasma ion levels (mmol l^–1)
Ca²⁺	3.8±0.1	4.0±0.2	3.7±0.2	3.9±0.2	3.6±0.2	3.8±0.2	3.1±0.1^*
Mg²⁺	0.8±0.0	1.2±0.1^*	1.0±0.0^*	1.0±0.0	0.9±0.0	0.7±0.0	0.8±0.0
K⁺	2.1±0.2	2.9±0.2	3.0±0.4	3.9±0.3^*	3.4±0.6^*	3.4±0.4^*	3.2±0.2

		Hypoxia							Recovery after hypoxia
	Normoxia	4 h	8 h	12 h	24 h	6 h	12 h
Gill morphology (μm)
Protruding lamellar height	78.9±1.7	80.2±1.8	89.1±1.4^*	100.6±2.2^*	107.2±1.6^*	102.3±2.0^*	92.4±2.3^*
Protruding lamellar basal length	350.8±6.7	356.5±9.0	368.8±9.3^*	389.0±10.5^*	412.3±11.6^*	388.4±7.1^*	364.7±8.5^*
Lamellar thickness	11.8±0.5	11.8±0.9	10.6±0.6^*	9.1±0.3^*	8.4±0.4^*	10.6±0.8^*	11.2±0.4^*
Number of nuclei in interlamellar cell mass	17.5±0.6	–	–	12.7±0.5^*	10.4±0.2^*	10.9±0.4^*	12.2±0.3^*
Plasma ion levels (mmol l^–1)
Ca²⁺	3.8±0.1	4.0±0.2	3.7±0.2	3.9±0.2	3.6±0.2	3.8±0.2	3.1±0.1^*
Mg²⁺	0.8±0.0	1.2±0.1^*	1.0±0.0^*	1.0±0.0	0.9±0.0	0.7±0.0	0.8±0.0
K⁺	2.1±0.2	2.9±0.2	3.0±0.4	3.9±0.3^*	3.4±0.6^*	3.4±0.4^*	3.2±0.2

Values are means ± s.e.m. ^*Significantly different(P<0.05) from respective normoxic value