EvaluaciĆ³n de nuevas dietas basadas en microalgas nativas, como alimento de larvas de Erizo Rojo, Loxechinus albus (Molina, 1782)
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Fecha
2001
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es
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Universidad AndrƩs Bello
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Resumen
Se evaluĆ³, el efecto de nuevas dietas en base a microalgas nativas de la
V RegiĆ³n, Phaeodacty/um tricornotum y Aureococcus sp. , en base al
crecimiento, desarrollo y metamorfosis de larvas de Loxechinus a/bus (Molina,
1782). Las larvas fueron obtenidas, induciendo reproductores mediante una
inyecciĆ³n de soluciĆ³n de Cloruro de Potasio (KCI) 0.5 Molar en la membrana
peristomƔtica, logrƔndose el desove del39,4% de los ejemplares.
Las larvas fueron distribuidas, con una densidad inicial de 2 a 3
larvas/mi, en 14 acuarios de 9 litros cada uno (7 experimentos y 7 rƩplicas),
donde fueron probadas distintas dietas, usando como control, Chaetoceros
gracilis. El crecimiento y desarrollo larval fue normal con la mayorĆa de las dietas
utilizadas, a excepciĆ³n de las alimentadas con Aureococcus sp., las cuales
fueron de menor tamaƱo respecto de las alimentadas con la dieta control.
El mayor porcentaje de fijaciĆ³n se obtuvo en las larvas alimentadas con
Chaetoceros gracilis con un 13,3%, seguidas por las alimentadas con
Phaeodactylum tricornotum con un 9,3% de fijaciĆ³n. Con las dieta 3, 4 y 6, los
porcentaje de fijaciĆ³n no superaron el 8,5%.
Larvas alimentadas con Aureococcus sp, y el mix de Ć©sta con
Phaeodacty/um tricornotum, no presentaron la formaciĆ³n del esbozo equiniano,
lo cual se tradujo en la no metamorfosis de las larvas. Lo que indica que esta
microalga no es adecuada como alimento de larvas de Loxechinus albus.
We evaluated the efect in the new diets in base of native microalgae, Phaeodactylum tricornotum and Aureococcus sp. , over the increase, development and methamorphosis of larvas of Loxechinus a/bus (Melina, 1782). The larvas were obtain, inducing reproductives over one inyection of Potassium of Chloride (KCI) solution 0.5 molar in the peristhomatic membrane, gainig the spawn in a 34,9% of the samples. The larvas were distributed with a initial density of 2 to 3 larvas/mi, in 14 acuariums of 9 liters each one (7 experiments and 7 replicas), where were tested different diets, using as control, Chaetoceros gracilis. The larval increase and develoment was normal as in the majority of the diets that we use, in exception the ones that were feeded with Aureococcus sp. , which were smaller in comparison of the first feeded whit the control diet. The biggest porcentage of settlement was obtain in the larvas that were feeded whit Chaetoceros gracilis with a 13,3%, followed by the ones feeded whit Phaeodactylum tricomotum with a 9,3% of settlement. With the diets 3, 4 and 6, the porcentage of settlement was no superior of 8,5%. The larvas that were feeded with Aureococcus sp., and the mix of it, with Phaeodactylum tricornotum, didn't present the formation of the equiniano outline, that was translated as the methamorphosis of the larva. Which indicates that these microalgae it not useful as larval food.
We evaluated the efect in the new diets in base of native microalgae, Phaeodactylum tricornotum and Aureococcus sp. , over the increase, development and methamorphosis of larvas of Loxechinus a/bus (Melina, 1782). The larvas were obtain, inducing reproductives over one inyection of Potassium of Chloride (KCI) solution 0.5 molar in the peristhomatic membrane, gainig the spawn in a 34,9% of the samples. The larvas were distributed with a initial density of 2 to 3 larvas/mi, in 14 acuariums of 9 liters each one (7 experiments and 7 replicas), where were tested different diets, using as control, Chaetoceros gracilis. The larval increase and develoment was normal as in the majority of the diets that we use, in exception the ones that were feeded with Aureococcus sp. , which were smaller in comparison of the first feeded whit the control diet. The biggest porcentage of settlement was obtain in the larvas that were feeded whit Chaetoceros gracilis with a 13,3%, followed by the ones feeded whit Phaeodactylum tricomotum with a 9,3% of settlement. With the diets 3, 4 and 6, the porcentage of settlement was no superior of 8,5%. The larvas that were feeded with Aureococcus sp., and the mix of it, with Phaeodactylum tricornotum, didn't present the formation of the equiniano outline, that was translated as the methamorphosis of the larva. Which indicates that these microalgae it not useful as larval food.
Notas
Tesis (Ingeniero en Acuicultura)
Palabras clave
Erizo rojo, Larvas, AlimentaciĆ³n, Microalgas nativas