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Seasonal variation in the biochemical composition and carrageenan content were studied in  Eucheuma isiforme  from Yucatán, Mexico. Dry weight and carrageenan yield were lowest during the late cold-early dry seasons and highest during the late rain-early cold seasons. Total carbohydrates varied seasonally and were similar to variations in carrageenan yield. The factors responsible for the seasonal variation of biochemical and carrageenan characteristics of  E. isiforme  from Yucatán are interrelated, and their effects are difficult to separate. Thus our results suggest that biochemical composition can be related to seawater temperature and hence to growth, while incident light and nutrients can influence the carrageenan quantity. Although no direct growth estimation has been made, changes in  E. isiforme  dry weight suggest that active growth starts from the late cold season throughout the dry season when seawater temperature is optimal. The above coincided with an increase in protein content and a decrease in total carbohydrates linked to reduced carrageenan synthesis. Carrageenan content is higher during the early cold season, coinciding with high nutrient concentrations and reduced light. Carrageenan yield and viscosities in  E. isiforme  were near levels required for  Eucheuma  species in industrial applications, suggesting potential commercial/industrial use of this species. These results should be taken into consideration for the management of natural populations as well as for mariculture of this species on the Yucatán coast.

botanica marina

Carrageenan of  Eucheuma isiforme  (Solieriaceae, Rhodophyta) from Yucatán, Mexico. II. Seasonal variations in carrageenan and biochemical characteristics