Latitudinal Variation in the Abundance and Oxidative Capacities of Muscle Mitochondria in Perciform Fishes

• DOI: 10.1242/jeb.201.1.1
• Publication Date: 2021-04-25T04:23:07Z
• Authors: Ian A. Johnston; Jorge Calvo; Helga Guderley; Daniel Fernandez; Lisa Palmer
• Keywords: 0301 basic medicine; 03 medical and health sciences; 14. Life underwater

The abundance, distribution and oxidative capacities of mitochondria have been investigated in the red pectoral fin adductor muscles fish (Order Perciformes) that use a predominantly labriform style swimming. Mediterranean Sea species from families Labridae, Serranidae, Sparidae Antarctic Nototheniidae non-Antarctic Channichthyidae were studied. Sub-Antarctic Beagle Channel, Tierra del Fuego, included pelagic haemoglobin-less icefish (Champsocephalus esox) robalo (Eleginops maclovinus), which occurs as far north 35 degrees S. In Champsocephalus esox, mitochondrial volume density muscle was 0.51 cristae surface (43. 9 microm2 microm-3) higher than reported for icefishes. red-blooded, active or semi-pelagic species, within range 0.27-0.33 regardless habitat temperature. Amongst less demersal ranged 0.29-0.33 polar to 0.08-0.13 species. myofibrils occurred ribbons clusters one fibril thick entirely surrounded by mitochondria. intracellular lipid droplets not correlated with activity patterns comparison Eleginops maclovinus caught summer (approximately 10 C) winter 4 C), did differ, whereas fish. temperature-dependence state 3 respiration rate isolated pyruvate substrate described single quadratic relationship all indicating no significant up-regulation maximum oxygen uptake per milligram protein Our results support conclusion increasing is primary mechanism enhancing aerobic capacity cold-water