Potential use of phototrophic algae as protein and/or lipid source in aqua-feeds

Published on: 10/25/2016
Author/s : Dr. Ingrid Lupatsch / AB Agri Ltd

In aquaculture, producers commonly rely on formulated feeds to ensure optimal growth, health and quality of the farmed animal. Fish meal and fish oil from wild fisheries have traditionally been major constituents of aqua-feeds as they are excellent raw materials from a nutritional point of view, but their supply is finite. Therefore feed ingredients other than fish meal are selected for their nutr...

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Biplab Banerjee Biplab Banerjee
M.Sc in Zoology, Ph.D
October 25, 2016
Thanks for the paper. In fact majority of the fin fish farmers in West Bengal do not favor the inclusion of any protein from animal origin like fish meal,fish oil etc. Inclusion of algae as a source of protein and fat will certainly encourage them and at last rightly been commented: " supplies increase and costs decrease, algal biomass and biomass extracts will continue to occupy niche markets within the aqua-feed sector".Again I want to convey sincere appreciation to Dr. Ingrid Lupatsch for her reseach. Dr.Biplab kumar Banerjee
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Trong Chu Trong Chu
Agriculturist
October 26, 2016
verywell thanks
Reply
October 26, 2016
Duckweed can provide a high protein, inexpensive source of protein in fish and livestock diets. Contact me on Linkedin for details:

Louis Landesman, Ph.D
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October 26, 2016

Market forces will dictate prices in relation to other sources not cost of production. Prices unlikely to come down. Limiting input resourses for such products will in all probality keep this as niche product.
The notion that you can make inroads into global use with such products in aquafeeds is a falacy, just as insect meal is which was in vouge some three decades ago. Academic cycles for grant funding seems to be the order of the day!

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Biplab Banerjee Biplab Banerjee
M.Sc in Zoology, Ph.D
October 27, 2016
Duck weed , Eichornia etc. all these types of aquatic floating weeds may be a good source of protein but fact remains they are good absorbers of heavy metals of various types too. Inclusion of these in aqua feed as ingredients needs verification. Dr.Biplab kumar Banerjee
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Carlos Tay Carlos Tay
Consultant
October 28, 2016
In my experience in Central America, with shrimp ant tilapia ponds, indicates that promoting micro algae in ponds has a very positive effect in the feed conversion rate (FCR). In average you can reduce your FCR in 0.2-0.4 enhancing de micro algae growth. Specially diatoms, Cyclothella sp. , Navicula sp, Chaetoceros sp, among others.

Also this increase of algae will create a better dissolved oxygen condition during all day.
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October 28, 2016
How can we try this in Africa
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Paul Roberts Paul Roberts
Biologist
October 28, 2016
Algae are like any other agricultural crop; they get weeds growing among them.
Discuss: How you control unwelcome algal invaders as some can toxic?
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Eros Kaw Eros Kaw
Industrial Engineer
November 3, 2016
@ paul roberts, we use a specific bacteria to keep cyano bacteria away. and we grow chlorella to feed shrimps. we also grow daphnia and we feed the daphnia to trout and shrimp.

but the key is chlorella. very high in protein. and the shrimps grow faster
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November 6, 2016
This is one of the areas that need serious development in aquaculture especially in Africa.
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Agwata Ototo Agwata Ototo
Animal Nutritionist
February 1, 2017
Can we work on an isolation procedure of the algae and start its culture steps ?
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August 29, 2019
Dear Dr. Ingrid Lupatsch, given that your data is pretty much a full description of the experimental evidence thus far,it may be an idea the break down the cell walls of these algae using ultrasonics as this kills the algal specie by actually breaking down the cell walls which thus kill the algal species targeted. I am aware that not all algal species have cell walls that will break down with ultrasound, by by varying the signal frequency and choosing the attack the algal species at a particular time in their growth cycle and before the walls thicken up too much one may be able to control the harvesting cycle to suit the particular algal sp. Given that fish only require a fifth of the amount of live feed to grow at for times the rate of farmed fish one can see that manufactured food is most inefficient and expensive way to produce farmed fish. Carnivorous species will and do grow amazingly well on live food and are under nourished on manufactured food. Yes, all fish are not the same and the way the way that they have continued to present susceptibility to farmed influences for the last 50 years must be worrying.. Thank you for your comments Dr. Ingrid Lupatsch.
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Louis Landesman
Louis Landesman
Ph.D
  Petersburg, Virginia, United States
 
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