Effect of urchin size and diet on gonad yield and quality in the green sea urchin (Strongylocentrotus droebachiensis).

By C. M. Pearce, Tara L. Daggett, S. Robinson. 2004

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A comparison of the effect of urchin size and diet on gonad yield and quality in the sea urchin Evechinus chloroticus Valenciennes (2008, background): “Pearce et al. (2004) postulated four possible reasons for size-related differences in urchin gonad increase when enhanced: (1) larger urchins have proportionately less energy available for gonad production due to increased basal metabolic and/or maintenance costs, (2) larger urchins may have lower…”
Improving gonad colour and somatic index in the European sea urchin Paracentrotus lividus (2005, background): “Natural algal diets or addition of natural h-carotene product derived from spray-dried algae, Dunaliella salina, resulted in intensification of gonad colour (McBride et al., 1997, 1999; Robinson et al., 2002; Pearce et al., 2004), whereas neither synthetic h-carotene nor astaxanthin improved gonad c”