IN BRIEF - From biodiesel by-product to tilapia farming (ScienceNordic)
Wednesday, January 25, 2012
The world needs food and the world needs energy.
"That is why it is so exciting to upgrade by-products from biodiesel, in this case rapeseed meal, to a better protein source for fish," says Trond Storebakken.
He is professor at the Aquaculture Protein Centre (APC), a Norwegian Centre of Excellence that is affiliated with the Norwegian University of Life Science (UMB).
Rapeseed for fish
The Chinese PhD student Youling Gao recently proved that high amounts of rapeseed meal can be used efficiently in feed for tilapia.
"We observed fast growth, efficient feed utilisation, and found no health problems," says Storebakken.
The access to protein rich rapeseed meal will increase as the demand for rapeseed oil for biofuel increases.
The disadvantage with rapeseed meal from biofuel production is that unwanted substances called glucosinolates are concentrated in the meal.
These substances are natural pesticides for the plant and prevents the rapeseed against being eaten by insects. They’re not poisonous in themselves, but are transformed to toxins by an enzyme in the rapeseed when the plant is damaged or attacked by insects. The same type of enzymes can be activated when rapeseeds are processed into feed.
Once rid of these glucosinolates, rapeseed meal will be an even better protein source for farmed fish. Recently APC tried to destroy the glucosinolates by subjecting rapeseed meal to solid-state fermentation. In the trials preformed by APC it was difficult to obtain stable conditions during fermentation, but the tilapia grew better on fermented rapeseed meal, than on untreated rapeseed meal.
Scientists from APC therefore move on to find out how to efficiently utilise rapeseed meal from the production of biodiesel in feed for tilapia, with the help of fermentation. Ruminants have an effective way of getting rid of glucosinolates, by letting microbes in the rumen ferment the feed.
"Inspired by what’s going on in the rumen, we’re now trying out wet fermentation with two different cultures of microbes. While the first culture of microbes shall remove the fibre network that protects the glucosinolates, the next will destroy them once released," says Olav Fjeld Kraugerud, postdoctor at APC.
The conditions at the lab are naturally not identical to the rumen, but the main principles are the same.
Back to biodiesel
Rapeseed is the most important protein producing plant on world basis next to soy. But the utilisation of this plant to other animals than ruminants is limited because of glucosinolates and phytic acid. These are the substances APC wants to remove.
" With the large interest we’re seeing on using the oil from rapeseeds to produce biodiesel, the protein is left over and we have to utilise it for food," says Storebakken.
Salmon Group, a large network of family-owned fish farming and aquaculture companies that collectively represent 12 percent of the overall production volume in Norway, recently released the report “Fish welfare in fish farming – What is that?" which challenges the commercial salmon-farming industry to aim much higher and be far more closely aligned on issues related to the well-being of these fish throughout their lifecycle. In an interview with SeafoodSource, Salmon Group Chief Advisor Fish Health and Nutrition Ingebjørg Oddsdotter Sævareid said that while there has been a strengthened focus on fish welfare recently.
Author: Jason Holland / SeafoodSource | Read the full articlehere
From today, the following minimum prices apply for NVG herring for human consumption:
Group 1 (herring weighing 350 grams and more): NOK 5.09 per kg
Group 2 (herring weighing between 300 grams and 348 grams): NOK 5.01 per kg
Group 3 (herring weighing between 200 grams and 299 grams): NOK 4.91 per kg
Group 4 (herring weighing between 125 grams and 199 grams): NOK 4.81 per kg
Group 5 (herring weighing less than 125 grams): NOK 3.82
Group 5 (herring weighing less than 125 grams - sorted into fishmeal/oil): NOK 2.00 per kg
The minimum prices are subject to regulation every week either on the basis of achieved prices or on the basis of minimum prices for nvg herring for flour / oil plus NOK 0.60 per kg. Information about changes in the minimum prices will be announced on our website on Fridays. And the new minimum prices will take effect from the following Monday.
Author: Dale Nilsson / Norges Sildesalgslag (article has been translated from original in Norwegian)
Los pescadores franceses podrían pagar para pescar en aguas británicas después del Brexit. Según un experto, los pescadores franceses podrían verse obligados a pagar por pescar en aguas británicas después del Brexit.
El primer ministro Boris Johnson podría facturar al presidente francés Emmanuel Macron millones cada año por los pescadores que quieren acceder a nuestras aguas. Por ello, Johnson y Macron podrían llegar a un acuerdo sobre la pesca, pero solo si el presidente francés da marcha atrás en sus demandas.
At first and scheduled for this month of October, the Millennium + 20 World Aquaculture Conference (GCA) had to be postponed due to the COVID-19 pandemic. The new dates have been set for September 2021, from 22 to 27 of that month, in Shanghai, China.
In this framework, and prior to the celebration of the GCA on its new dates, FAO has organized a series of webinars on various topics of interest for the sustainable development of aquaculture that will be held during the week in which the GCA should have originally been held, that is, from October 26 to 29.
Source: iPac.acuicultura | Read the full articlehere
India, Ecuador… or Bavaria? The third location might not seem like the obvious place to source vannamei shrimp from but Crusta Nova, a German agtech and seafood company, is producing 30 tonnes of them a year, from an RAS near Munich.
The company was founded in 2012 by Dr Fabian Riedel, a lawyer who decided to hang up his gown at the age of 29 to try something completely different.
“My former co-founder had fish ponds outside Munich and, having studied at the Technical University of Munich (TUM) in Weihenstephan, decided to farm yabbies [crayfish] in a small RAS,” he explains.
Author: Rob Fletcher / The Fish Site | Read the full articlehere
It is the final crucial point in the feed pellet’s journey from silo to pen, and now Gael Force have developed a feed spreader that well and truly steps up to the mark to deliver feed safely and gently into the pen.
Robustly engineered, SeaFeed Spreader has an adjustable outlet nozzle which can be customised in its alignment by site operatives to suit different feed types and pen sizes thus offering a variable spread to suit individual farm feeding styles.
Author: Janice Johnston / Fish Farmer | Read the full articlehere
Norway and Russia have reached an agreement for 2021 which provides grounds for optimism in the fishing industry, according to Norway’s Minister of Fisheries and Seafood Odd Emil Ingebrigtsen.
‘I am very pleased that we have also for next year been able to reach an agreement that both safeguards the interests of the fishing industry and is sustainable. This is a bright spot in a situation where the corona pandemic also affects the fishing industry,’ he said.
Author: Quentin Bates / FiskerForum | Read the full article here
Some 2,000 kg of adult eels and 35,000 young eels have been released into the Desheng River, south China's Guangdong Province, to proliferate the eel breeding population in the natural watercourse.
Eels are a cash species in China. Due to the combined influence of the global climate, environmental challenges and human activities, aquatic resources have decreased sharply worldwide.
Young eels are caught in mainland China in early spring and spend about half a year in farms growing to maturity and fattening up.Image: Eel at a farm in Guangdong Province, China. (Photo by Takumi Sasaki)
Eel farming has been developed in south China's Pearl River Delta. In May, the eel species in Shunde City was included in China's national list of famous and excellent agricultural products.
This eel release activity, which was carried out Friday, is expected to help restore the eel stock in the area. Scientists will trace the growth of the released eels in order to explore ways to promote the conservation of aquatic resources.
The environmental organization WWF has published a report on the occasion of World Food Day prepared by the NGO with the collaboration of Agrocampus Ouest (France), the University of British Columbia (Canada), the Charles Darwin Foundation (Galapagos) and the Institute Nacional de Pesca (Ecuador) which reveals that "half of the world's fish production is at risk due to the climate crisis." I can see the full report here (in English).
This is because small-scale fishers, who account for half of the world's fish production, "are disproportionately affected by the consequences of a warmer ocean."
Source: Fisheries Industries | Read the full articlehere
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