Comparison of macroalgal (Ulva and Grateloupia spp.) and formulated terrestrial feed on the growth and condition of juvenile abalone
Mulvaney, WJ and Winberg, PC and Adams, LR, Comparison of macroalgal (Ulva and Grateloupia spp.) and formulated terrestrial feed on the growth and condition of juvenile abalone, Journal of Applied Phycology, 25, (3) pp. 815-824. ISSN 0921-8971 (2013) [Refereed Article]
Copyright 2013 Springer Science+Business Media Dordrecht
Abstract The culture of abalone is a growth industry in
Australia that primarily utilises terrestrial crops to produce
formulated pellet feeds. The use of cultivated macroalgae in
place of such feeds could provide for better environmental,
nutritional and/or economic outcomes for this industry.
However, direct comparison trials using macroalgae and
formulated crop feeds are rare, and it is therefore difficult
to ascertain the benefits and costs of each feed type. This
study compares the benefits to growth and performance of the
cultivated hybrid abalone cross (Haliotis rubra 1814 Leach
and Haliotis laevigata 1808 Donovan) which was fed one of
eight dietary treatments, including two commercially formulated
pellet feeds and six mixed macroalgae dietary treatments.
Macroalgae dietary treatments comprised the three
macroalgae species Grateloupia turuturu Yamada, Ulva australis
Areschoug and/or Ulva laetevirens Areschoug. Four
replicate tubs, each containing 40 juvenile abalone (10–
15 mm), were used to test each dietary treatment over a 12-
week period. Macroalgae dietary treatments provided for significantly
higher specific growth rates of abalone compared to
formulated feeds, by orders of magnitude, for both length
(>0.2 % compared to <0.1 %day−1, F7, 31=22.3, p<0.0001)
and weight (from <0.4 to >0.8 %day−1, F7, 31=24.4, p<
0.0001). In addition, abalone health and condition increased,
and the proximate composition of abalone tissue had a higher
carbohydrate/protein ratio, higher ash content and lower lipid
content. These findings suggest that the juvenile abalone may
benefit from macroalgae diets in comparison to two formulated
feeds as a result of optimal proximate composition of the
algae biomass and improved condition of the abalone.
Keywords Abalone . Aquaculture . Grateloupia turuturu .
Nutrition . Seaweed . Specific growth rate . Ulva australis .