The effect of feeding or starvation on resource allocation to body components during the reproductive cycle of the sea urchin Sphaerechinus granularis (Lamarck).

To determine the effects of feeding or starvation on resource allocation to body components during the reproductive cycle of Sphaerechinus granularis, sea urchins were placed in laboratory tanks and either fed ad libitum or starved during two different periods of their biological cycle, i.e. the mature stage and the recovery stage. The urchin growth was monitored over the whole experimental period, the gonad, gut, lantern indices and organic matter levels of different organs were determined at the end of the experiment. During the mature stage sea urchins in good nutritional conditions did not increase in size, but allotted energy to gonad production and stored reserves in body wall. Limiting food stopped the gonadal growth without complete regression. During the recovery period food allowed somatic growth, i.e. test growth and the storage of reserves in gonad somatic cells. This somatic production did not occur under food-limited conditions and the resources allotted for survival and maintenance were taken from different body components.