Table 1.

Changes in muscle ultrastructure with thermal habitat and thermal acclimation in fish

Mitochondria
Habitat or acclimation temperatureSpeciesFibre typeVolume density (%)% sub-sarcolemmalMyofibril volume density (%)Lipid droplet volume density (%)Mitochondrial cristae density (μm2 μm-3)
Antarctic Trematomus newnesi 1 O31±1.967.8±2.736±1.93±0.735.8±8.2
Gobionotothen gibberifrons 2 C15.9±0.7NA40.1±0.9NA29.63±1.6
Chionodraco rastrospinosus 2 C20.1±0.7NA24.5±1.26NA21.52±0.7
Chaenocephalus aceratus 2 C36.5±2.1NA25.1±1.6NA20.0±0.8
Sub-Antarctic
Champsocephalus esox 1 O51±2.637.9±5.538±2.6043.9±2.1
Summer Eliginops maclovinus 1 O33±7.360.1±3.345±1.90.3±1.039.2±3.9
Winter Eliginops maclovinus 1 O31±1.469.9±3.145±2.10.4±0.2NA
Summer Paranotothenia magellanica 1 O27±1.565.5±2.346±1.70.4±0.245.1±4.7
Temperate
5 °C Morone saxatilis 3 O44.8±2.4NA42.8±1.77.9±1.451.8±1.8
25 °C Morone saxatilis 3 O28.6±1.8NA65.8±2.10.6±0.346.9±1.4
5 °C Morone saxatilis 3 G4.0±0.4NA85.2±0.5NA49.3±1.6
25 °C Morone saxatilis 3 G2.7±0.3NA88.8±0.2NA52.1±1.5
Winter (1 °C) Oncorhynchus mykiss 4 O26.9±0.94256.3±1.510.0±1.040.2±0.6
Summer (16 °C) Oncorhynchus mykiss 4 O27.0±1.041.560.3±0.77.5±0.636.4±1.2
Summer acclimation
5 °C Carassius carassius 5 O27±2.2NANANA25.8±1.0
25 °C Carassius carassius 5 O11±1NANANA15.5±0.8
Winter acclimation
5 °C Carassius carassius 5 O21±0.8NANANA13.9±1.0
25 °C Carassius carassius 5 O10±0.7NANANA10.7±0.1
Autumn acclimation
2 °C Carassius carassius 6 O24±134.6±2.842±1NANA
28 °C Carassius carassius 6 O12±122.2±1.258±0.8NANA
  • Muscle fibres are oxidative (O), glycolytic (G) or cardiac (C).

    Volume densities are % fibre volume. 1Johnston et al. (1998); 2O'Brien and Sidell, 2000; 3Egginton and Sidell (1989); 4St-Pierre et al. (1998); 5Kilarski et al. (1996); 6Johnston and Maitland (1980).

    Values are means±S.E.M. (N values are given in original papers); NA, not available.