Reproductive performance of the Mesa silverside (Chirostoma jordani Woolman, 1894) under natural and controlled photoperiods
Biocell
;
36(3): 105-111, Dec. 2012. graf, tab
Artículo
en Inglés
| LILACS
| ID: lil-694710
ABSTRACT
Chirostoma jordani is a native annual species inhabiting lacustrine waters of the Central Mexico Plateau. It is widely distributed and is currently facing high environmental pressures. Five experiments were performed to study the reproductive performance of this species. Four of the experiments were conducted in 270-L indoor recirculation tanks. Two males and one female at the first stage of reproduction were included in each test. A photoperiod of 14 light hours and 10 dark hours was used. In a fifth experiment, 10 females and 15 males were kept in an outdoor 3,000-L recirculation tank under natural photoperiod. The number of spawns, fertilised eggs and 30-day-old juveniles were counted and the survival rate was calculated. The results indicated significant differences (P< 0.05) between treatments. Higher spawn numbers and greater egg production were observed under controlled photoperiod, and higher numbers of juveniles and a higher survival rate were observed under natural photoperiod. The trials exhibited different patterns of egg production during the experiment. The egg production in the natural-photoperiod trials followed a polynomial curve model. In contrast, the trials under the controlled photoperiod showed an irregular pattern of increases and decreases in egg production.
Texto completo:
Disponible
Índice:
LILACS (Américas)
Asunto principal:
Reproducción
/
Peces
Tipo de estudio:
Estudio pronóstico
/
Factores de riesgo
Límite:
Animales
País/Región como asunto:
México
Idioma:
Inglés
Revista:
Biocell
Asunto de la revista:
Clulas
Año:
2012
Tipo del documento:
Artículo
País de afiliación:
México
Institución/País de afiliación:
Universidad Autónoma de Aguascalientes/MX
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