Seasonal changes in body weight and biochemical components of Mediterranean Chthamalus stellatus (Poli) and Euraphia depressa (Poli)

Seasonal changes in the dry body weight and in the biochemical components of Chthamalus stellatus (Poli) and Euraphia depressa (Poli) from the Mediterranean coast of Israel were recorded. The relationship of these changes to breeding was determined. The body weight increased gradually from October to December-January, remaining steady until July. During October-May, total lipids, total carbohydrates and total proteins increase. The main breeding season of both species is restricted to July-August. Following fertilization in July, there is a decline in the values of the above-mentioned components. Maximal DNA values were detected during the fertilization period after which a decline was noted.