Potential of innovative marine aquaculture techniques to close nutrient cycles

Abstract

Aquaculture is an established technique for producing marine species. However, it creates large amounts of nutrient-rich waste. Therefore, it is worth examining the methods available to use these nutrients and close the nutrient cycle. This review covers research activities of different saline water methods for food production.These are Integrated Multi-Trophic Aquaculture (IMTA), Biofloc Technology (BFT) and marine aquaponics. IMTA combines on-and offshore aquaculture with macroalgae and filter feeder production. Commercial implementations have been achieved but are not widely used. Especially shrimp are suitable for cultivation in saline BFT systems. Few commercial deployments exist. There is a well-established market for the products of IMTA and BFT systems. Marine aquaponics is increasingly being tested as part of an expansion of Recirculating Aquaculture Systems (RAS) and BFT systems, but commercial implementations are not known. Moreover, there is no established market for the resulting salt-tolerant plants (halophytes). Market prices and popularity were evaluated to assess the economic potential of the different plant and aquaculture species farmed with IMTA, BFT and marine aquaponics. There are established markets for well-known products, but therefore the competition is greater. Niche products are offered occasionally, but often achieve top prices. Closing nutrient cycles and increasing saline water usage for food production as well as high product diversity are necessary to mitigate the increasing pressure on freshwater resources and to be able to feed the growing world population. Therefore, IMTA, BFT and marine aquaponics are promising techniques for reducing pressure on freshwater resources and improving food supply.

Circular bio‐economy in aquaculture

“…With regard to Conceptualizing and/or designing circular production systems , we called for ‘Circular production systems, such as aquaponics, integrated multi‐trophic aquaculture systems, etc.’. For this topic, four interesting reviews emerged, one relevant for marine aquaculture, 18 two relevant for inland aquaculture 19 and one for both 20,21 . Some lesser known approaches were taken to the forefront by Garibay‐Valtez et al, 20 Lothmann and Sewilam, 18 and Zhao et al, 21 while promising solutions were revisited from a wider industry perspective by Marousek et al 19 …”

“…For this topic, four interesting reviews emerged, one relevant for marine aquaculture, 18 two relevant for inland aquaculture 19 and one for both 20,21 . Some lesser known approaches were taken to the forefront by Garibay‐Valtez et al, 20 Lothmann and Sewilam, 18 and Zhao et al, 21 while promising solutions were revisited from a wider industry perspective by Marousek et al 19 …”

“…With regard to Conceptualizing and/or designing circular production systems, we called for 'Circular production systems, such as aquaponics, integrated multi-trophic aquaculture systems, etc.'. For this topic, four interesting reviews emerged, one relevant for marine aquaculture, 18 two relevant for inland aquaculture 19 and one for both. 20,21 Some lesser known approaches were taken to the forefront by Garibay-Valtez et al, 20 Lothmann and Sewilam, 18 and Zhao et al, 21 while promising solutions were revisited from a wider industry perspective by Marousek et al 19 With regard to Reduce, the call stipulated 'Reducing emissions and footprints of aquaculture' which was complemented by Arantzamendia et al 22 exploring the feasibility of bio-based solutions for innovations in materials used in aquaculture as a possible emerging new science field.…”

“…For this topic, four interesting reviews emerged, one relevant for marine aquaculture, 18 two relevant for inland aquaculture 19 and one for both. 20,21 Some lesser known approaches were taken to the forefront by Garibay-Valtez et al, 20 Lothmann and Sewilam, 18 and Zhao et al, 21 while promising solutions were revisited from a wider industry perspective by Marousek et al 19 With regard to Reduce, the call stipulated 'Reducing emissions and footprints of aquaculture' which was complemented by Arantzamendia et al 22 exploring the feasibility of bio-based solutions for innovations in materials used in aquaculture as a possible emerging new science field. Within this process, the call further stipulated 'Connecting aquaculture research to side streams (pharmaceutical, biofuel, etc.…”

Efficacy of Probiotics to Control Ammonia in Oreochromis Niloticus Fishponds in Volta Region, Ghana

“…Oxidation of ammonia to nitrite by bacteria (Nitrosomonas sp.) and oxidation of nitrite to nitrate by other bacteria (Nitrobacter) are the principle stages of the nitrogen cycle, which means that the presence of these two bacteria is inevitable to convert and eliminate bacteria from the aquatic ecosystem [3,[19][20][21][22][23]. Th e use of probiotics for O. niloticus aquaculture and their effi cient role in ammonia removal was observed using B. subtilis in [24], and B. cereus, B. amyloliquefaciens, and Pseudomonas stutzeri in O. niloticus aquaculture [19].…”