Page 24 - Vol.36-No.8 issue

FISHERIES

Conclusion More attention is needed to reduce the
reliance on live, fresh and frozen seafood
While a significant quantity of infor- as major ingredients in broodstock diet.
mation is available on marine fish and Phytotherapy, the use of herbal and plant
shrimp broodstock nutritional require- extracts and compounds can significant-
ments, optimal nutrition, feeding re- ly contribute to broodstock condition
quirements and management are still far through direct and indirect effects on
from optimal. This is especially true for nutrition, physiology, vitellogenesis and
new and ’developed’ species. immune system.

Table 2: Examples of herbal extracts in broodstock diets Botanical name Family
Distribution Useful parts Biological effect in aquaculture Reference

Botanical Name Family Distribution Useful parts
Cinnamonum Zeylanicum Lauraceae India, Sri Lanka Bark
Elettaria cardomomum Scitaminaceae India, Burma, Sri Lanka Dried ripe seeds
Eugenia caryophyllata Myrtaceae India, Sri Lanka Fruits and dried f ower buds
Mesua ferrea Guttiferae Andaman, Nicobar Islands Flowers buds, seeds and bark
Asparagus racemous Liliaceae India Leaves and Root
Mucuna pruriens Papilionaceae Tropics Seeds, roots and legumes
Witania somnifera Solanaceae India Root and leaves

Circle 26 on enquiry card
NANOBUBBLES: NEW CHEMICAL-FREE ALTERNATIVE

REDUCES THE RISK OF FOODBORNE ILLNESSES

WITHIN THE AQUACULTURE INDUSTRY

ANTHONY JAMES October 5, 2020
ultrasonication, the nano-sized bubbles ia Seafood Agricultural Research and
collapse and produce oxidants that inac- Extension Center, Virginia Tech. “These
tivate pathogens and remove microbial findings provide a new antimicrobial
biofilms. A recent Virginia Tech study approach for reducing fish and shellfish
observed nanobubbles effectively re- pathogens in our aquaculture industry.”
ducing the number of A. hydrophila bac-
teria by more than 6 log cfu/ml (colo- The Virginia Tech study follows earlier
ny-forming units per millilitre). research carried out at Arizona State Uni-
Microscopic bubbles of water, known versity’s (ASU) National Science Founda-
as ‘nanobubbles’, invisible to the naked The process provides a chemical-free tion Nanosystems Engineering Research
eye and 2,500 times smaller than a sin- solution to sanitise and treat food for Center for Nanotechnology Enabled
gle grain of table salt, are being used in human consumption, preventing the Water Treatment (NEWT) in September,
combination with ultrasound to help fight spread of harmful bacteria. It could also which found that Moleaer’s technology
seafood-borne pathogens. With seafood be used to enhance conventional sanitis- created a chemical-free advanced ox-
consumption continuing to grow, provid- er’s efficacy, providing a more reliable idation process (AOP), degrading and
ing a valuable source of daily protein to and consistent method for eliminating removing organic pollutants from water.
billions globally, the technology has vast bacteria that have built up resistance to “Our technology has been tested and
potential. commonly used chemical solutions. It proven to eliminate or reduce water-
also has potential beyond aquaculture,
Developed by US firm Moleaer, a lead- with researchers examining its use in borne pathogens, biofilms, and bacte-
ing nanobubble technology company, in cleaning surfaces throughout the food ria across industries,” concluded Nick
partnership with researchers from Vir- supply industry. Dyner, CEO, Moleaer. “We welcome the
ginia Tech, the new method combines findings from Virginia Tech and are ex-
oxygen-filled nanobubbles with ultra- “Based on our research, we found that cited to be at the forefront of developing
sound to reduce Vibrio parahaemolyti- nanobubbles when combined with ultra- new, sustainable alternatives for treating
cus and Aeromonas hydrophila – lead- sound achieved a reduction in aquatic and preventing bacteria and harmful
ing causes of fish and shellfish illness pathogens that are common causes of pathogens our food supply. The latest re-
disease. seafood borne disease and illness such sults are another testament to our capa-
as gastroenteritis,” explained Reza Ovis- bility to restore aquatic health, improve
Moleaer’s nanobubble technology in- sipour, assistant professor, Department water quality, and reduce the usage of
jects trillions of oxygen-rich nanobub- of Food Science and Technology, Virgin- traditional chemicals for treating water.”
bles into water. When combined with
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22 Vol. 36 No. 8