Flores-Santana, R.E. (2008). Variación en el contenido de ácidos grasos del copépodo calanoide Pseudodiaptomus euryhalinus (Johnson, 1939) alimentado con las microalgas Chaetoceros calcitrans y Isochrysis galbana. Tesis de Maestría, Centro de Investigaciones Biológicas del Noroeste, S.C., La Paz, Baja California Sur, Mexico. 52 pp. [In Spanish; English abstract].

499717

Flores-Santana, R.E.

2008.

52 pp. [In Spanish; English abstract]

Publication

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The effect of three diets based in Chaetoceros calcitrans & Isochrysis galbana microalgae over the population behavior, biochemical composition and fatty acid concentration of the calanoid copepod Pseudodiaptomus euryhalinus grown at 26 ±2 °C & 35 ±1 UPS was evaluated. Unialgal diets of C. calcitrans (Treatment 1), I. galbana (Treatment 2) and a balanced mixture of both (Treatment 3) were provided for 27 days to the copepods in 88 l tanks. Samples were taken every 24 hours to determine the total number of organisms in the four size intervals: 50 to 100 µm, 100 to 200 µm, 200 to 300 µm y 300 µm or more. Population monitoring showed a consistent tendency to a higher copepod production in T3, with an average production of 1136 ±406 cop/day, followed by T1 with 893 ±290cop/day and T2 at last with 785±327 cop/day. The total carbohydrate and lipid contents in copepods increased gradually in every size interval and in all treatments, except for the fourth size interval (300 µm or more) where this tendency reverted. This is coincident with the beginning of the mating age in copepods and the formation of egg-sacs in female copepods. Fatty acid analysis delivered in both microalgae showed marked differences, indicating that I. galbana has a significantly higher concentration of linoleic acid (LA), linolenic acid (LNA) and docosahexaenoic acid (DHA) compared to C. calcitrans, which is superior in arachidonic acid (ARA) and eicosapentaenoic acid (EPA). These differences were proportional between copepods fed the three diets, suggesting a marked tendency towards fatty acid assimilation in its free form and a low or none essential fatty acid synthesis from their metabolic precursors. Key words: Calanoid copepods, biochemical composition, essential fatty acids.

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