Muscle growth in Antarctic and Subantarctic notothenioid fishes

• Published in: Scientia Marina
• Main Authors: Daniel Alfredo Fernández, Jorge Calvo, Ian Alistair Johnston
• Format: Article in Journal/Newspaper
• Language: English
• Published: Consejo Superior de Investigaciones Científicas 2005
• Subjects: antarctic notothenioids; subantarctic notothenioids; muscle development; muscle growth; temperature; hypertrophy; hyperplasia; Aquaculture. Fisheries. Angling; SH1-691; Antarctic; The Antarctic; Antarc*; antarcticus
• Online Access: https://doi.org/10.3989/scimar.2005.69s2325; https://doaj.org/article/b4a0d48f8cde47368f8514c5c8c711e2

The suborder Notothenioidei comprises 122 species divided into 8 families, with members of 6 of the families living outside Antarctic waters. The Antarctic species underwent an extensive radiation from a small demersal ancestor to occupy different ecological niches and levels in the water column. The axial muscle of Antarctic and some Subantarctic notothenioids is unusual in containing very large diameter muscle fibres and a low muscle fibre number. Maximum fibre diameters are greater than 500 mm in many species. There is no indication of systematic differences in fibre number, fibre type composition, ATPase activity, time of cessation of fibre recruitment (hyperplasia) and swimming performance between Antarctic and Subantarctic species. Instead, fibre number is significantly decreased in species belonging to the most derived families relative to the more basal families (a trend that also correlates with an increase in the diameter of the fibres). The length of the cell cycle of the muscle fibres shows cold compensation in the Antarctic species H. antarcticus relative to the closely related Subantarctic one (H. bispinis). Feeding after a starvation period results in a strong stimulation of the proliferation of muscle fiber progenitors in H. bispinis. Similar studies have not yet been performed on any Antarctic species.