Browsing by Author "Domingues, P."
Now showing 1 - 3 of 3
Results Per Page
Sort Options
- Effects of culture density and live prey on growth and survival of juvenile cuttlefish, Sepia officinalisPublication . Domingues, P.; Poirier, R.; Dickel, L.; Almansa, E.; Sykes, António V.; Andrade, José PedroThe European cuttlefish, Sepia offıcinalis Linnaeus 1758, has a number of characteristics, such as a fast growth rate and benthic life style, which make this one of the most promising species for large-scale culture (Domingues 1999). One of the key factors in large-scale aquaculture is to optimise growth while minimizing the culture space required (Forsythe et al. 2002). Until now, only Nabhitabhata (1999) and Forsythe et al. (1994), Koueta and Boucaud-Camou (1999) indicated stocking densities for cultured cuttlefish populations. Laboratory-cultured cuttlefish have been studied in several aspects of their behaviour. Nevertheless, effects of tank size and animal density on growth, condition and reproduction are not known (Boal et al. 1999). Crowding can have a major effect on growth and behaviour in many species, and in aquaculture this factor can be very important (Sumpter 1993).
- Effects of feeding live or frozen prey on growth, survival and the life cycle of the cuttlefish, Sepia officinalis (Linnaeus, 1758)Publication . Domingues, P.; Sykes, António V.; Sommerfield, Anne; Andrade, José PedroThe European cuttlefish, Sepia officinalis belongs to the family Sepiidae. About 100 species of cuttlefish have been found around the world (Okutani 1990). From these, S. officinalis, is one of the most well known, and the most easily cultured (Forsythe et al. 1994). This species has been grown in laboratories and public aquaria around the world (Boletzky 1983; Clarke et al. 1989, Domingues 1999) and more than two or three consecutive generations have been cultured throughout the years (Richard 1966; Pascual 1978; Boletzky 1979; Toll and Strain 1988; Forsythe et al. 1994; Lee et al. 1998; Domingues et al. 2001b). Cuttlefish (S. officinalis) hatchlings are born as miniature replicas of adults, and have similar basic behavior as adults, namely a marked benthic mode of life (Warnke 1994). During the first few weeks of their life, cuttlefish have to be fed live prey, usually mysid shrimp (Richard 1975; Forsythe et al. 1994; Domingues 1999; Domingues et al. 2001a). Afterwards, they will accept dead food, such as frozen shrimp, fish or crabs (DeRusha et al. 1989; Forsythe et al. 1991; Domingues et al. 2001a). Some authors have cultured this species making this transition to dead food (Pascual 1978; Forsythe et al. 1994), while others fed live prey throughout the life cycle (Domingues et al. 2001a, 2001b, 2002).
- Growth and survival of cuttlefish (Sepia officinalis) of different ages fed crustaceans and fish. Effects of frozen and live preyPublication . Domingues, P.; Sykes, António V.; Sommerfield, Anne; Almansa, Eduardo; Lorenzo, António; Andrade, José PedroThree feeding experiments, using live mysid shrimp, grass shrimp or fish fry as prey for 1-, 30- and 60-day-old cuttlefish were conducted to determine the efficiency of each dietary source in relation to cuttlefish size and age. Additionally, a fourth experiment using fish fry and grass shrimp, but previously frozen, was also conducted. The results showed that when 1-day-old cuttlefish were fed mysids, grass shrimp or fish for 4 weeks, mysids were the best prey, but only during the first week. From this moment until the end of the experiment, the best growth rate was when cuttlefish were fed grass shrimp. Cuttlefish fed fish fry showed the poorest growth rate throughout the experiment. Similarly, cuttlefish aged 30 or 60 days fed grass shrimp or fish fry had the best growth rates when fed grass shrimp. When cuttlefish were fed live fish, survival increased with size of cuttlefish (73.3%, 91.7% and 100% for 1, 30 and 60 days cuttlefish, respectively). In the fourth experiment, using frozen diets, overall acceptance of each diet (feeding rates) was the same for fish and shrimp. However, lower growth was obtained when cuttlefish were fed fish compared to grass shrimp. This lower growth was due to a lower food conversion (28% vs. 41%). Since cephalopod paralarvae and juvenile most likely need prey rich in polyunsaturated fatty acids (PUFA), phospholipids and cholesterol, and a moderate content in neutral lipids, we have analyzed the biochemical compositions of the different prey to evaluate the influence of this factor on growth and survival.