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- The effects of light intensity on growth and survival of cuttlefish (sepia officinalis) hatchlings and juvenilesPublication . Sykes, António V.; Quintana, Daniel; Andrade, José PedroCephalopods, particularly the European cuttlefish (Sepia officinalis), are considered to be potential species for aquaculture diversification due to their high growth rates in captivity (Domingues, Sykes & Andrade 2001; Domingues, Bettencourt & Guerra 2006) and great demand as food throughout different regions of the world (FAO 2009). Nonetheless, cuttlefish differ from fish in several biological aspects, thus requiring different approaches to solve similar or new problems associated with their culture. For instance, the hatchling stage has been identified as the most problematic due to mortality and the need of live prey. Several factors might influence growth and mortality of cuttlefish in captivity, such as culture conditions and nutritional requirements of the species. According to Downing and Litvak (1999), there is a need to understand the physical and biological factors that act on developing fish larvae to create protocols that maximize survival and growth under culture conditions. It is known that system design may promote stress and lower animal welfare in finfish (Conte 2004) and the same seems to apply to cuttlefish.
- The effects of tank colours on the growth and survival of cuttlefish (Sepia officinalis, Linnaeus 1758) hatchlings and juvenilesPublication . Sykes, António V.; Domingues, Pedro M.; Márquez, Lorenzo; Andrade, José PedroThe e¡ects of di¡erent tank colours (white, yellow sandy and black) on the growth, mortality and biomass production were studied for hatchling and early juvenile cuttle¢sh. For hatchlings, the use of di¡erent colour tanks did not promote di¡erences in growth due to the higher variability (standard deviation) found in the white- and sand-coloured tanks. Black tanks promoted the lowest and highest values for total mortality and biomass respectively. For juveniles, the use of di¡erent tank colours promoted di¡erent growth (Po0.05), but not mortality. Black tanks promoted the best results in terms of growth and biomass. The results obtained in the present study advise the use of black (or dark colour) tanks in the hatchling and early juvenile stages to reduce the standard deviations associated with growth, mortality and biomass production. This will contribute to minimize problems associated with slow and fast growers and competition.