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Volume 39- Number 1 - 2004

Hormonal induction to spawning and larval description of the grunt Orthopristis ruber Cuvier (Pisces: Haemulidae)

Ernesto Mata1, Jesús Rosas2, Aidé Velásquez1 & Tomas Cabrera1


(1) Escuela de Ciencias Aplicadas del Mar. Universidad de Oriente
(2) Instituto de Investigaciones Científicas. Universidad de Oriente, Núcleo de Nueva Esparta, Apartado postal 788, Porlamar, Venezuela



The spawning induction of the grunt Orthopristis ruber Cuvier, 1830 (Pisces: Haemulidae) was realized through the use of Luteinizing Hormone Releasing Hormone Analogue (LHRHA). Two doses were used (50 and 25 ng/Kg). Two females were injected with each dose while four male were injected just with 50% of each doses. The same number of organisms was injected with distilled water. One female and two males were placed in 2000 L tanks, each treatment was duplicated. Only females injected with 50 ng/Kg produced viable eggs, with a fertilization percentage of 85 ±10% and a hatching rate of 95 ± 2% at 17 h from spawning at 23.95 ± 0.59°C and 37 psu. Larval description was realized from recently hatched larvae of 1.35 ± 0.15 mm of total length and 1.25 ± 0.16 mm of notochordal length. At 48 h the mouth opening was detected. The metamorphosis started 17 days after hatching. The hormonal induction technique permitted to obtain Orthopristis ruber larvae which were described. Larval feeding consisted of a mixture of microalga (I. galbana) rotifer (Brachionus plicatilis) and Apocyclops distans copepodites.


Palabras clave: Desarrollo larval, desove experimental, golfo de Venezuela 



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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