British Antarctic Survey, Natural Environment Research Council, Madingley Road, High Cross, Cambridge, CB3 OET, England.
Fish Physiol Biochem. 1987 Jan;3(1):1-6. doi: 10.1007/BF02183988.
Antarctic fish of the family Channichthyidae (Icefishes) lack the respiratory pigments haemoglobin and myoglobin. The morphometrics and ultrastructure of the ventricular myocardium of a benthic icefish,Chaenocephalus aceratus has been compared with that of a red-blooded Notothenioid fish,Notothenia neglecta, of similar habit.The mass of ventricular muscle as a percentage of bodyweight is 3 times greater in adultC. aceratus (0.32%) thanN. neglecta (0.11%). Myoglobin concentration in the ventricle ofN. neglecta, 20 nmoles/g, is comparable to that of temperate teleosts with similar activity patterns. The volume and surface densities of mitochondria are 41.5% and 0.32 μm(-1) for Icefish and 25% and 0.15 μm(-1) forN. neglecta, Cytochrome oxidase activities are similar in the two tissues whilst the volume density of myofibrils is higher forN. neglecta (47%) thanC. aceratus (29.9%).The proliferation of mitochondria in the myocardium of Icefish will reduce the diffusion path-length for oxygen between ventricular lumen and the outer mitochondrial membrane and may compensate for the absence of myoglobin.
南极鱼科（冰鱼）的鱼类缺乏呼吸色素血红蛋白和肌红蛋白。底栖冰鱼 Chanocephalus aceratus 的心室心肌的形态计量学和超微结构已与类似习性的红血 Notothenioid 鱼类 Notothenia neglecta 进行了比较。成年 C. aceratus（0.32%）的心室肌肉质量占体重的比例是 N. neglecta（0.11%）的 3 倍。N. neglecta 心室中的肌红蛋白浓度为 20nmoles/g，与具有相似活动模式的温带硬骨鱼相当。线粒体的体积和表面密度分别为冰鱼的 41.5%和 0.32μm(-1)和 N. neglecta 的 25%和 0.15μm(-1)。两种组织中的细胞色素氧化酶活性相似，而 N. neglecta（47%）的肌原纤维体积密度高于 C. aceratus（29.9%）。冰鱼心肌中线粒体的增殖将减少氧气在心室腔和外线粒体膜之间的扩散路径长度，并可能弥补肌红蛋白的缺失。
