Intraspecific density effect on growth of Marphysa “sp.” Juveniles

João Pedro  Garcês; Pedro  Pousão-Ferreira

doi:10.3989/scimar.05078.012

Autores/as

João Pedro Garcês IPMA - Portuguese Institute for the Ocean and Atmosphere, EPPO Aquaculture Research Station https://orcid.org/0000-0002-1684-4422
Pedro Pousão-Ferreira IPMA - Portuguese Institute for the Ocean and Atmosphere, EPPO Aquaculture Research Station https://orcid.org/0000-0001-6746-764X

DOI:

https://doi.org/10.3989/scimar.05078.012

Palabras clave:

acuicultura, densidad, crecimiento, Marphysa, poliquetos

Resumen

El poliqueto Marphysa “sp.” (Eunicidae), comúnmente conocido en Portugal como “ganso”, es muy utilizado en todo el mundo, como cebo para la pesca deportiva y profesional. Los efectos de la densidad intraespecífica sobre el crecimiento de los juveniles se estudiaron durante un período de cuatro meses en laboratorio. Se utilizaron tres densidades: baja (50 gusanos), media (150 gusanos) y alta (250 gusanos) en acuarios de 0.25 m², con arena y agua en recirculación. Longitud total (cm), peso seco (g) y el número de segmentos se registraron en 60% de la población inicial. Se contaron también todos los poliquetos para determinar la tasa de mortalidad y comportamiento territorial a través de la existencia de lesiones corporales, segmentos posteriores ausentes o en regeneración. Los resultados obtenidos, mostraron que el crecimiento fue significativamente mayor en las densidades más bajas (p<0.001). Para todos los niveles de densidad, el crecimiento diario estimado fue mayor en el primer mes, disminuyendo progresivamente con el tiempo. La alta agresividad y comportamiento territorial de los juveniles de Marphysa “sp.”, bien evidenciada en el primer mes, por la mayor mortalidad (35%) verificada en la alta densidad y por la presencia de gusanos con lesiones en la baja densidad (30%), sugiere que la territorialidad es probablemente el factor principal que regula la organización y distribución espacial de los individuos dentro de una población. En conclusión, los resultados obtenidos revelan que los juveniles de Marphysa “sp.” tienen un comportamiento muy territorial y agresivo, que debe considerarse si la especie se utiliza para la producción acuícola. Se necesitan estudios adicionales para determinar los efectos de la densidad para diferentes etapas de desarrollo.

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