The disparity in response to black or white substrates in farmed prawns may be similarly influenced by quantified differences in animal colour between ponds (Wade et al., 2014), and this may in fluence the response to substrate colour. An animal that is already very dark may not show a strongresponse to dark substrates compared with an animal that is less pigmented before exposure. In addition, the colour of P. monodon has been observed to become redder when subjected to thermal and hypoxic stress, but this effect was reversible when the stress was removed (de la Vega et al., 2007). This stress response may also be evident during harvesting, the effects of which are likely to cause uncooked prawns to become significantly redder and hence produce a darker cooked prawn colour
Overall, results of the farm-based trial demonstrate that this method can produce darker, more desirable prawns that can fetch higher market prices. It perhaps has the most potential to correct the colour of prawns from ponds known to produce poor pigmentation, and equalise
the variation between ponds during harvesting and processing. It is equally important to ensure that the harvest method is not causing a significant loss of colour prior to cooking. However, the practicalities of intentionally holding large numbers of animals for long periods of time may restrict its application.
The disparity in response to black or white substrates in farmed prawns may be similarly influenced by quantified differences in animal colour between ponds (Wade et al., 2014), and this may in fluence the response to substrate colour. An animal that is already very dark may not show a strongresponse to dark substrates compared with an animal that is less pigmented before exposure. In addition, the colour of P. monodon has been observed to become redder when subjected to thermal and hypoxic stress, but this effect was reversible when the stress was removed (de la Vega et al., 2007). This stress response may also be evident during harvesting, the effects of which are likely to cause uncooked prawns to become significantly redder and hence produce a darker cooked prawn colourOverall, results of the farm-based trial demonstrate that this method can produce darker, more desirable prawns that can fetch higher market prices. It perhaps has the most potential to correct the colour of prawns from ponds known to produce poor pigmentation, and equalisethe variation between ponds during harvesting and processing. It is equally important to ensure that the harvest method is not causing a significant loss of colour prior to cooking. However, the practicalities of intentionally holding large numbers of animals for long periods of time may restrict its application.
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