Effect of arm regeneration on energy storage and gonad production in Ophiocoma echinata (Echinodermata: Ophiuroidea)

Abstract

Two laboratory experiments were conducted on Ophiocoma echinata (Lamarck, 1816) collected from Missouri Key, Florida, USA, to ascertain the effects of arm regeneration on energy storage and gonad production. In each experiment individuals were divided into non-regenerating (all arms intact) and regenerating (three arms autotomized) groups and maintained together in a re-circulating seawater system for 2 mo. In Experiment 1, individuals were fed once a week, and in Experiment 2 once every 2 wk. The amount of food energy required for maintenance was estimated to be 0.172 kJ d⁻¹. The lower feeding level (Experiment 2) was below maintenance ration and both groups lost material relative to an initial group. At the higher feeding level (Experiment 1), regeneration of three arms resulted in less storage of organic material, mainly lipid in the stomach, and less gonad production. Thus, regeneration may reduce energy reserves and reproductive output.