Reproductive Biology

The life span of the emerald notothen is 8-10 years; in McMurdo Sound, first spawning occurs at five years. Females spawn biennially; initial oocyte development takes one year and active vitellogenesis (deposition of yolk within the growing egg) another year. Spawning takes place over a brief period, from October to November in Adelie Land and December to January in McMurdo Sound. Fecundity is on the order of 1,5003,000 eggs, which are attached to rocks, algae, or sponges; mature eggs are 0.16 in (4 mm) in diameter. There are reports that the emerald notothen tends egg masses in sponges.

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