- Ernæring
- Fisk og skaldyr
Bedre foder resulterer i bedre mad til os alle
Hos BioMar forstår vi, at rejsen til enestående fisk og rejer begynder længe før, den når bordet, og den starter med det foder, der giver næring til fisk og rejer.
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Udforsk
In fish farming, being attentive to oxygen levels and implementing oxygenation are important prerequisites for maintaining economic growth rates.
Oxygen is one of the foremost important vital gasses for fish to thrive and needs to be present in farm water in appropriate quantities. A fish can regulate its oxygen requirement until the oxygen content in the water reaches a critical low point. In order to avoid suffocation of the fish during the shortage, the water must be additionally enriched with oxygen.
Oxygen measurement
Large fluctuations in the oxygen content of fish farming water have a negative impact on the well-being of the fish. In trout farming, for instance, the recommendation is to keep the oxygen level at 100 % as it enters the pond, and that the oxygen content at the outflow should still measure 70 % for the needs of the trout to be adequately met. It is beneficial to use an oxygen measuring device that will record data over an extended period. Regular or continuous measurements make it possible to identify poor environmental conditions at an early stage, allowing to take the necessary countermeasures.
Oxygenation
At sub-optimal oxygen levels, experience shows that oxygenation of the production water is necessary to achieve optimal feed conversion rates. It is rarely a feasible option to use an additional water supply to improve the oxygen level. Therefore, it is often necessary to implement technical solutions.
Methods of oxygen enrichment
The various methods of oxygen enrichment vary in terms of how effective they are and of their impact on other gases in the water. The maximum possible oxygen saturation offered varies from 70 % with a paddle-wheel surface aerator to several hundred percent with pressure systems and liquid oxygen.
The different methods of oxygen enrichment vary in terms of how effective they are.
Introduction of liquid oxygen – example jet platform
It is worth noting that the use of liquid oxygen is the only method that can achieve an oxygen saturation of over 100 %. It is also relevant to know that the water is not "refreshed" by the enrichment with liquid oxygen but is merely saturated with oxygen. All degassing should be completed prior to oxygenation. One method of oxygen enrichment using liquid oxygen is the jet platform. In a jet platform, water passes from a distribution chamber through a horizontal plate with specially designed nozzles, creating water jets. The jets travel through a chamber enriched with oxygen by means of liquid oxygen.
Since, the jets hit the surface of the water surface approx. 20 cm below the plate. The jets blow oxygen bubbles down into the water, creating a “fog of bubbles”. This ensures that the oxygen mixes well with the water, and here, in the dissolution zone, the oxygen dissolves into the water. An efficient jet platform requires a difference of height between the water surface in the distribution chamber and the water surface in the outflow of approx. 75 cm. This can often be achieved using natural gravity. If this is not possible, a relatively energy-efficient propeller pump may be installed.
Picture: Jet platform (schematic cross-section). The jet platform is a method of oxygen enrichment using liquid oxygen. The use of liquid oxygen is the only oxygenation method that can achieve an oxygen saturation of over 100 %.
Aeration columns
Aeration columns, also known as cascade aerators, are often made up of bio-blocks or perforated plates, which bring the water into contact with the air over a large surface area. The water is channelled by means of a pump or by using a natural gradient. The size of the cascade depends on the quantity of water involved. In principle, 1 bio-block serves a water quantity of approx. 12 – 15 l/sec. It is necessary for the bio-blocks to be well ventilated. And, as with all systems, cleaning must be carried out on a regular basis to avoid blockages and the overgrowth of algae.
Picture: Aeration column (schematic cross-section). An advantage of this system lies in the simultaneous partial removal of undesirable gases.
One advantage of this system lies in the simultaneous partial removal of undesirable gases such as carbon dioxide, ammonia and nitrogen, and in spring water, some of the active carbonic acid can be removed.
Airlift pump
The principle of an airlift pump is that compressed air is blown through a system consisting of perforated tubes at a depth of 70-80 cm. This system introduces oxygen from the air into the water. In many fish farms, these systems are installed as a permanent feature. It is likewise possible to use portable airlift pumps. The airlift can also increase the water circulation in the pond and lead to a partial "de-gasification" of the water.
Airlift pump, design and application
Surface aerator
Surface aerators are installed above the surface of the water. They use electrically operated "paddles/propellers" to aerate the water.
The water is refreshed through contact with the air. A maximum saturation of 70 % oxygen can be achieved with water temperatures up to approx. 15 °C. It is difficult to guarantee the necessary oxygen supply for economic feed conversion rates using a surface aerator.
BioFarm – BioMar’s Expert Advisory Team
Many years of experience, a huge number of measurements, and reports from farmers who have introduced oxygenation equipment show that the costs of buying oxygen measuring devices and the time spent on supervision as well as an immediate response to water values are worthwhile and soon covered by the increased revenues from higher growth/better feed conversion rates and an increased vitality and health status of the fish.
The cleaning and maintenance of any measuring and oxygenation equipment are important routine tasks as they ensure that the devices function correctly and economically. BioMar’s technical advisory team, BioFarm, offers support in the management of oxygen and other fish farm management topics. Feel free to contact the BioFarm team member responsible for your area for further information.
Resultater (24)
- Produkter
- Ernæring
UdforskGuar - The plant that powers ice cream and fish farms
Guar, or Cyamopsis tetragonoloba, might not sound glamorous, but it powers a surprising range of industries. From your pantry to petroleum, and even into fish feed, this underappreciated crop is quietly shaping the world around us.
- BioFarm
- Partnerskaber
UdforskTrials: The essential tool for choosing the right feed
Selecting the right feed is critical for achieving production goals on a fish farm. Conducting feed trials directly on the farm is the most effective way to identify the best option. BioMar helps guide this process.
- Klimaindsats
- Produkter
UdforskCertifications & Quality Systems
At BioMar, we are committed to ensuring that our feed and raw materials meet the highest standards of safety, quality and sustainability; and that our operations are safe for our employees and the environment. To demonstrate this dedication, we comply with a range of internationally recognised quality certifications and standards. Every step of our value chain is certified to comply with international standards
- Klimaindsats
- Ernæring
UdforskAlgaPrime: Unexpected Algae Heroes
As the global demand for sustainable aquaculture practices continues to rise, so does the need for alternatives to traditional fish meal and fish oil. One of the most promising innovations in this space is AlgaPrime, a revolutionary ingredient that provides a sustainable and nutritious source of omega-3 fatty acids, particularly DHA.
- Klimaindsats
- Partnerskaber
UdforskVejen mod et bæredygtigt fiskeopdræt
Their aquaculture journey began with curiosity sparked by an unused pond on his father’s land. With no prior experience in fish farming but a strong background in finance and business, Lauris Apsis saw an opportunity to create something meaningful. Recognizing sustainability as the key to long-term success, Lauris and his Finnish partner, Salmela-Yhtiot Oy founded Blue Circle (Zivs uz Ledus), a Latvian farm dedicated to producing premium Arctic char using cutting-edge recirculating aquaculture systems (RAS).
- Nye ingredienser
- Klimaindsats
UdforskPoultry Meal: A Sustainable Protein Source for Aquafeed
Poultry meal is emerging as a valuable ingredient in aquafeed formulations, offering a circular protein and mineral source that supports the growth and development of farmed fish. Rich in essential amino acids, fatty acids, vitamins, and minerals, poultry meal is highly palatable and plays a crucial role in maintaining fish health and productivity.
- BioFarm
- Ernæring
UdforskCreating the perfect pink fish fillet: The strategy behind pigmentation
At the BioMar factory in Denmark, we assist salmon and trout farmers with tailored solutions, backed by our technical expert team, BioFarm. These advisors are dedicated to sharing knowledge on pigmentation strategies, helping our partners achieve top-quality fish fillets.
- Fisk og skaldyr
- Ernæring
UdforskSpiselig andel af laks
Slagteklare laks blev analyseret for at bestemme den spiselige del. Resultatet viste, at hele 74 procent af laksen bestod af rent fiskekød.
- P3.0 Concept
- BioFarm
UdforskMindre er mere
Fiskeopdrættere kan opnå bedre resultater ved at bruge mindre foder
- Fisk og skaldyr
- Aktivere mennesker
UdforskFisk en effektiv proteinkilde
Akvakultur er en af de mindst ressourceintensive former for fødevareproduktion.
- Genoprettende
- Ernæring
UdforskBioMar supports green transition: The future of fish feed is about to get greener
As the aquaculture industry expands, one of the key challenges is finding sustainable and nutritious alternatives to traditional ingredients like fishmeal and fish oil, which have been the cornerstone of aquafeeds historically. One promising alternative that is gaining attention in aqua-faced formulation are horse beans.
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