Feed Management in Intensive Aquaculture

Goddard, Stephen

doi:10.1007/978-1-4615-5861-3

Cited by 132 publications

(106 citation statements)

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“…It was observed that the maximum growth and the best FCR do not coincide with the highest AFR. The lowest FCR occurs at AFR, below those at which maximum growth occurs such as what is reported in literature for fish (De Silva and Anderson 1995;Goddard 1996). However, regarding growth, the statistical analysis did not show significant differences between all diet groups.…”

Section: % Of Total Fassupporting

confidence: 51%

Influence of natural diet on growth and biochemical composition of Octopus vulgaris Cuvier, 1797

2010

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The influence of diet on growth and biochemical composition of cultured Octopus vulgaris was investigated. Octopuses were reared in a open recirculation seawater system and during the experiment were kept apart in cages. Experiment lasted 30 days. Three experimental dietary groups were established: group I (mixed diet: Carcinus mediterraneus, Boops boops and Mytilus galloprovincialis), group II (monodiet on B. boops) and group III (monodiet on M. galloprovincialis). The best results were obtained with the monodiet based on bogue that gave a weight gain of 390.65 ± 37.54, an absolute growth rate of 13.02 g day -1 and feed efficiency of 44.79 ± 0.96%. Regarding to biochemical composition, the mussel-fed and bogue-fed groups showed the highest protein content. Animals fed on bogue also showed the highest carbohydrate content, while the lowest value was observed in the mussels-fed group. The lipid content was found to be very low in all dietary groups. Saturated fatty acids were the most abundant fatty acid class, ranging from 58.22% in wild octopuses to 46.83% in bogues-fed octopuses. Polyunsaturated fatty acids (PUFAs) were the second most abundant fatty acids class in all dietary treatments (25.65-37.00% as a per cent of total FAs) except in octopuses fed with mussels. MUFAs ranged from 11.44 to 26.93% of total FAs. Although it is empirically known that a varied diet better covers the nutritional requirements than a monodiet, the results of this study reveal that a monodiet of B. boops may be used.

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Section: % Of Total Fassupporting

confidence: 51%

Influence of natural diet on growth and biochemical composition of Octopus vulgaris Cuvier, 1797

2010

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“…In some fish farms, water temperatures are increased to the maximal level within the optimal range to increase the feeding rate, leading to enhanced growth rates. This in turn leads to an elevated metabolic rate and more rapid transit of food through the fish's digestive system (Goddard 1996). Velasco and Barros (2007) observed that the Caribbean scallop (Nodipecten nodosus) had a higher growth rate at 25 C than 20 or 28 C. Velasco and Barros (2007) further indicated that temperature also played various roles in the process of gonadal maturation in the scallop.…”

Section: Please Scroll Down For Articlementioning

confidence: 95%

Temperature effects on the toxicity of four trace metals to adult spotted Babylonia snails (Babylonia areolata)

Hajimad

Vedamanikam

2013

Toxicological & Environmental Chemistry

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A study was conducted to determine the median lethal toxicity of four heavy metals on the marine gastropod Babylonia areolata. Median lethal toxicity tests were conducted to observe the sensitivity of this gastropod to metals and how variations in temperature might affect toxicity of test elements. Four heavy metals were used in the study. It was observed that the 96-hr LC 50 (in mg/L) for the different metals was found to be nickel (Ni) 33.53 (35.at room temperature 24 C. With temperature as a variable, median lethal concentration (LC 50 ) values were observed to increase from 22.41 mg/L at 10 C to 27.34 mg/L at 28 C and reduce to 18.43 mg/L at 30 C and a further rise in toxicity was observed at 35 C where LC 50 value was 12.7 mg/L as seen in the case of Zn. It was also observed that at 40 C thermal and chemical toxicity overlapped as 100% mortality was observed in controls. This trend was noted in all metals for Babylonia areolata indicating that temperature played an important role in determining LC 50 values of toxicants.

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“…The feed ration for a given species is infl uenced by feed formulation, water temperature, fi sh size, dissolved oxygen and carbon dioxide concentrations, fi sh health, and management goals (Goddard 1995). Feed size should be appropriate for the size of fi sh in each rearing unit.…”

Section: Use Effi Cient Feeding Practicesmentioning

confidence: 99%

“…Feed can be delivered by hand, by demand feeders, or by mechanical and automatic feeders. Whenever possible, feed utilization should be monitored by observing feeding behavior or by looking for trends in waste feed that collects within the culture unit or waste feed exiting the culture unit (Goddard 1995;Summerfelt et al 1995). Multiple feedings distributed over a 24-hour period will provide more uniform water quality within a recirculating system than a feeding schedule offering feed only once or twice daily.…”

Section: Use Effi Cient Feeding Practicesmentioning

confidence: 99%