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Volume 36- Number 2 - 2001
Article


Effect of Tetraselmis chuii, Nannochloris oculata and Dunaliella salina on the population growth of Apocyclops distans (Copepoda, Cyclopoidae) at different temperature and ligth conditions

Aidé Velásquez1, Jesús Rosas2, Tomas Cabrera1, José Millán2 & Miguel Hernández1

 

(1) Escuela de Ciencias Aplicadas del Mar
(2) Instituto de Investigaciones Científicas
Universidad de Oriente, Isla de Margarita. Venezuela

 

E-mail: rosas@ne.udo.ve

 

Several experiments were conduced to determine the effect of the microalgae Tetraselmis chuii, Nannochloris oculata and Dunaliella salina on the population growth of Apocyclops distans (Kiefer, 1956) at different temperature and light conditions. During 10 days A. distans (5 ind/mL) was cultured in tested tubes (540) containing 5 mL of seawater inoculated with the microalgae last mencionated as unialgal diets, at natural temperature (26–33,8 ºC) and lab temperature (22 ± 1ºC) under three light conditions, photoperiod (12 h light: 12 h dark), dark and continuous light; each was triplicated. The maximum value of nauplii (105.33 ± 48.58/5mL) and copepodits production (25.33 ± 11.93/5mL) was obtained in dark and natural temperature at the third day and natural photoperiod and temperature to sixth culture day respectively using T. chuii. The statistical analysis showed that temperature was the most important factor in the nauplii production with T. chuii and photoperiod and diet on the copepodits production. The highest average value of adult females carrying no eggs (26.66 ± 36.66/5mL) and adult females carrying eggs (9.66 ± 5.50/5mL) was attained at the sixth day under natural temperature and third culture day under natural temperature and dark respectively, with T. chuii. The maximum average value of liberated eggs mass (27.33 ± 17.92/5mL) was produced at natural temperature with N. oculata, the light was not significant (P £ 0.01). The highest total number of copepods attained was 132.66 ± 34.00/5mL under dark and natural temperature at the third day with T. chuii. The results obtained with D. salina were not significant on the population growth of A. distans (P £ 0.05). It was concluded that A. distans obtained a complete development and to prefer T. chuii, the highest volume and mobility of three microalgae used N. oculata and D. salina microalgae produced the lowest total copepods number average values, although they permitted the complete development of A. distans.

 

Key words: Copepods, feeding, microalgae

 

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1Laboratorio de Zooplancton, Instituto de Ciencias del Mar y Limnología,Universidad Nacional Autónoma de México. A. P. 70-305, 04510 México, D. F. México
 
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