ResumenCon el objetivo de determinar diferencias en el crecimiento de la concha de abanico Argopecten purpuratus procedentes de diferentes lugares, se realizaron dos experimentos de cultivo comparativo en sistemas suspendidos, tales como "pearl-nets" y linternas. El primer experimento se realizó con semillas obtenidas en laboratorio (IMARPE) y semillas silvestres colectadas en Bahía Independencia, Pisco; en el segundo, las semillas fueron colectadas de banco natural en Bahía Samanco y Lagunillas, Pisco. El trabajo se realizó en la playa "El Carbón", Pucusana. Para ambas experiencias se estimaron tasas de crecimiento, los parámetros K y L∞, índice de crecimiento (Φ) y factor de condición (FC). Se aplicó un análisis de covarianza (ANCOVA) y una prueba t para comparar las curvas de regresión longitud-peso.Los resultados mostraron diferencias en el crecimiento y factor de condición entre los grupos estudiados. En todos los casos las tasas de crecimiento observadas son comparables con los estimados por otros autores. Se discute que las diferencias se deberían a la variabilidad genética entre las poblaciones de donde fueron obtenidas las semillas. Palabras clave: cultivo, Argopecten purpuratus, parámetros, crecimiento, longitud AbstractIn order to determine differences in growth of the Peruvian scallop Argopecten purpuratus from different areas, two comparative experiments in suspended systems, such as pearl-nets and lantern nets, were carried out. The first one, was performed with seeds obtained from the hatchery at IMARPE, and wild seeds collected at Independence Bay, Pisco; the second one, was done with wild seeds from Samanco Bay and Lagunillas, Pisco. The study was carried out in Playa "El Carbón", Pucusana. For both experiments growth rates, K and L∞, parameters, growth rate (Φ) and condition factor, were estimated. An analysis of covariance (ANCOVA) and a t-test to compare the regression curves of the length-weight relationship were applied. The results showed differences in growth rates and condition factor, among the studied groups. In all cases the growth rates are comparable with values estimated by other authors. It is argued that differences estimated are due to a genetic variability among populations from different seed sources.
El desarrollo temprano del calamar patagónico Loligo gahi D'Orbigny,1835 en aguas peruanas (Cephalopoda: Loliginidae) AbstractThe early development of the Patagonian squid, Loligo gahi D'Orbigny,1835, was studied in the field and in the laboratory. Egg strands, spawned off San Lorenzo Island, Peru, were collected, carried to the laboratory, and incubated in a closed sea water system. Egg capsules ranged from 88 to169 mm in length, and each capsule contained between 56 and 114 fertilized eggs. Individual eggs ranged from 1,7 to 2,1 mm in length, and the mantle length of hatchlings varied from 1,9 to 2,8 mm. Development took about 20 days at a mean temperature of 19 ºC. The pattern of embryonic development is similar to that previously observed in other species of Loligo. Following hatching, paralarvaes survived for 45 days with a diet of zooplankton (copepods, mysids and polychaete larvaes).
Se describen los cambios tempranos en huevos de Thais chocolata, durante su desarrollo y hasta el momento que las larvas eclosionan, a una temperatura de 22,5°C así como las oviposturas, bajo condiciones de laboratorio. Se presentan huevos esféricos, con diámetro promedio de 142,59u. Se observá un gran lóbulo polar en asociación con la primera segmentación. A la semana se encuentran larvas en trocófera y a los 13 días larvas prevelíger que presentan esbozo de conchilla. La etapa intracapsular culmina en 21 días, cuando las cápsulas eclosionan liberando al mar larvas velíger, con estómago larval velum desarrollado y bilobulado.
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