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Intensive Rearing of Juveniles of cichlasoma managuense (Günther 1869) in recirculated systems
(Universidad Nacional, Costa Rica, 1991-01-01)
The growth performance of guapote juveniles in recirculated systems from spawning to a mean weight of about 3 gramms is described. Culture began with a 15 days nursing phase with either first instar-nauplii or fresh ...
Interaction of bacteria and male reproductive system blackening disease of captive Penaeus setiferus
(Elsevier, 1993)
The genital apparatus of male penaeid shrimp, Penaeus sett’ferus, blackens with resulting detrimen tal effects ton mating for production of larvae when animals are kept in controlled maturation/repro duction situations. A ...
Fenología y desarrollo de las agallas de las ramas del güisaro (Psidium guineense Swartz) (Myrtaceae) y su relación con varias especies de Microhimenopteros en Heredia, Costa Rica.
(Universidad Nacional, Costa Rica, 1991-01-01)
En una población natural de güísaro (Psidium guineense), en Barva de Heredia, se estudió el desarrollo de las agallas de las ramas y la fenología de cuatro especies de micro himenópteros emergidos de ellas, desde abril de ...
Hábitos alimentarios del pargo mancha Lutjanus guttatus (Pisces: Lutjanidae) en el Golfo de Nicoya, Costa Rica
(Universidad de Costa Rica, 1996)
A total of 504 "Spotted Snapper" Lutjanus guttatus were collected monthly in the Gulf of Nicoya, Costa Rica, from January 1993 to January 1994 to determine its feeding habits. The fishes studied ranged 12-620 cm in total ...
Growth performance of Colossoma macropomum (Cuvier) juveniles at different feed rations
(Wiley & Sons, 1992)
Growth performance, feed utilization and changes in body composition of Colossoma
macropomum (Cuvier) juveniles — in the weight range 2 to 200 g — fed an artificial high protein
diet, have been analysed against feed ...
Utilización de variables morfometricas para explicar el comportamiento del peso fresco y eviscerado en tres especies de peces del género opisthonema. (Pisces: Clupeidae)
(Universidad Nacional, Costa Rica, 1992-01-01)
Se trabajó en la búsqueda del mejor modelo estadístico que explique el peso fresco y eviscerado, utilizando las variables morfométricas más sobresalientes. Mediante el análisis de varianza, se comprobó que hay diferencia ...
Preliminary evaluation of eyestalk ablation and thoracic ganglion importation on spermatophore quality and molting of male Penaeus vannamei
(Universidad Nacional, Costa Rica, 1992-01-01)
Males of Penaeus vannamei (mean weight = 25.05 ± 1.89 g), selected from a commercial semi-intensive pond, selected form a commercial semi-intensive pond, were used to study the effect of thoracic ganglion implantation on ...
The effect of high rearing densities on the growth of juveniles of the cichlid, cichlasoma managuense
(Universidad Nacional, Costa Rica, 1992-01-01)
The effect of high density culture on the growth of juvenile jaguar cichlids was investigated. Mean growth rate decreased with density, while the growth rate of the largest fishes was not affected. Reduction in mean growth ...
Growth of Jaguar Cichlid (Cichlasoma managuense) juveniles at different oxygen levels
(Universidad Nacional, Costa Rica, 1992-01-01)
The dependence of growth on the dissolved oxygen level was analyzed un juveniles of the guapote tigre, Cichlasoma managuense, in a recirculated system. The guapote tigre is relatively tolerant to low oxygen levels, averaging ...
Control de la reproducción de camarones marinos
(Universidad Nacional [Costa Rica ], 1998-01-01)
El entendimiento de la biología reproductiva básica es necesario para el mejoramiento de la producción de gametos de camarones. Esta presentación revisará nuestro conocimiento actual en materia de determinación sexual, ...