Effects of egg disinfection on yolk sac and first feeding stages of halibut (Hippoglossus hippoglossus L.) larvae

Efecto de la acriflavina, formalina y glutaraldehído sobre la desinfección y la eclosión de los huevos del botete diana Sphoeroides annulatus

“…Se ha demostrado que el glutaraldehído tiene un efecto positivo sobre la desinfección de huevos de especie de peces marinas, mejorando los porcentajes de eclosión, desarrollo y supervivencia de larvas (Harboe et al 1994, Salvesen et al 1997, Skjermo & Vadstein 1999. Se ha probado con éxito a altas concentraciones (hasta 1600 mg L -1 ) en diversas especies principalmente de aguas frías como la platija (Pleuronectes platessa), bacalao (Gadhus morhua), lenguado del Atlántico (Hippoglossus hippoglossus) (Salvesen & Vadstein 1995) y en especies de la familia Sparide como el sargo (Diplodus sargo), besugo (Pagrus pagrus) y la dorada (Sparus aurata) (Escaffre et al 2001, Katharios et al 2007).…”

“…La acriflavina se ha usado tradicionalmente para desinfectar huevos de peces marinos como es el caso del barramundi (Lates calcarifer), obteniendo resultados de eclosión mayores de 80% (Tucker 1998, Álvarez-Lajonchère & Tsuzuki 2008. El uso de la formalina para desinfectar huevos de especies dulceacuícolas y marinas ha sido muy eficiente, además es un agente químico aprobado en Estados Unidos de América para el mantenimiento saludable de cultivos intensivos de peces (Van Waters 1988, Shereier et al 1996, Gieseker et al 2006, Ibarra-Castro 2008; así mismo, el glutaraldehído se ha aplicado en especies marinas debido a su amplio espectro de actividad para desinfectar los huevos (Block 1977, Vadstein et al 1993, Harboe et al 1994, Salvesen & Vadstein 1995.…”

Egg surface decontamination with bronopol increases larval survival of Nile tilapia, Oreochromis niloticus

“…After natural spawning, the fertilized eggs are collected and transferred to a hatchery unit for intensive artificial egg incubation. Bacterial infections are suggested to be a major cause of both egg losses and occurrence of deformed fish larvae (Harboe et al 1994), however these are not attributed to specific obligate pathogenic bacteria, but rather to proliferation of opportunistic bacteria in the environment of intensive egg incubation (Skjermo and Vadstein 1999). The most common bacterial flora in hatcheries colonizing the surface of fish eggs are reportedly Flavobacterium sp., Aeromonas sp., Pseudomonas sp., and Vibrio sp.…”

“…A wide range of chemicals were reported as egg disinfectants for the routine use in fish hatcheries, e.g. benzalkonium chloride (Douillet and Holt 1994), glutaraldehyde (Salvesen and Vadstein 1995), formalin (Stuart et al 2010), hydrogen peroxide (Rach et al 1998;Rasowo et al 2007), iodine compounds (Salvesen and Vadstein 1995;El-Dakour et al 2013), and chlorine-based disinfectants such as sodium hypochlorite (Harboe et al 1994) and bronopol (Birkbeck et al 2006;Oono et al 2007). These disinfectants proved to be safe for different species of fish eggs, while highly toxic to aquatic pathogens.…”

EFFECT OF MICROALGAE ON GROWTH AND FATTY ACID PROFILES OF HARPACTICOID COPEPOD, Tisbe holothuriae

“…One reason why copepod nauplii might be nutritionally better than other live food sources is that they have high content of HUFA (highly unsaturated fatty acids), PUFA (poly unsaturated fatty acids), and other fatty acids needed to meet the nutritional requirements of a fish's early ontogeny (Witt et al, 1984). In fish hatcheries, copepod nauplii are preferred as the first live food for many fish species larvae such as gadoid larvae (Last, 1978), red snapper, Lutjanus campechanus (Rabalais et al, 1980), walleye Pollock, Theragra chalcogramma (Dagg et al, 1984), turbot (Witt et al, 1984), mahimahi, Coryphaena hippurus (Kraul, 1991), the cod, Gadus morhua (van der Meeren & Naess, 1993), gilthead seabream, Sparus aurata (Fernandez et al, 1994), halibut, Hippoglossus hippoglossus (Harboe et al, 1994), mangrove snapper, Lutjanus argentimaculatus (Doi et al, 1994), grouper, Epinephelus coioides (Kohno et al, 1997;Su et al, 1997), dhufish, Glaucosoma hebraicum and pink snapper, Pagrus auratus (Payne et al, 2001). Due to both high nutritional value and high abundance in natural waters, the use of copepods as live feed for larval fish in hatcheries should be encouraged and developed.…”