Environmental impact assessment of fish feed for aquaponic systems to introduce higher phosphorus and potassium in value-added fish sludge

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60076658%3A12520%2F25%3A43909624" target="_blank" >RIV/60076658:12520/25:43909624 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.1016/j.aquaculture.2025.742142" target="_blank" >https://doi.org/10.1016/j.aquaculture.2025.742142</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.aquaculture.2025.742142" target="_blank" >10.1016/j.aquaculture.2025.742142</a>

Result language

angličtina

Original language name

Environmental impact assessment of fish feed for aquaponic systems to introduce higher phosphorus and potassium in value-added fish sludge

Original language description

Potassium (K) and phosphorus (P) are often deficient in fish sludge and must be supplemented by inorganic fertilizers in aquaponics. The present work evaluated aquaponic fish feed formulation strategies that can do value-addition of fish effluents in terms of P and K for plants, reduce inorganic fertilizer use, and draw down overall environmental impact of integrated fish-plant food systems. Three similar protein (41 +/- 2 %) and energy (342 +/- 3 kcal 100 g(-1)) feed with graded P and K levels were validated in a tilapia-based aquaponic facility for 35 days, followed by a life cycle impact assessment (LCIA) per unit fish yield and plant nutrient fertilization during fish yield: (1) low KP feed (6.9 g P, 10.5 g K kg(-1) feed; trophic level 1.30, feed-food conflict 88.9 %), (2) medium KP feed (14 g P, 13.1 g K kg(-1) feed; trophic level 1.18, feed-food conflict 63.8 %), and (3) high KP feed (18.6 g P, 17 g K kg(-1) feed; trophic level 1.35, feed-food conflict 44.6 %). The final body weight, TGC, yield, and FCR did not significantly differ between low, medium, and high KP feed (p &gt; 0.05), but palatability was elevated (p &lt; 0.05) in low KP feed. Significantly higher (p &lt; 0.05) removable solids were generated by the medium and high KP feed. The best settleability of solids was observed in high KP feed. A high proportion of dissolved P, K in process water, as well as higher P, K bound to solids, under medium and high KP fed groups confirmed value addition of fish effluents (+290 % for P and + 33 % for K) for plant fertilization. For conventional aquaculture, use of low KP feed is the wise choice, bringing least environmental impact. But for aquaponics, in addition to fish yield, high KP feed created lowest environmental impact of K/P fertilization, compared to either low KP, medium KP feed, or inorganic P/K fertilizers. A high KP feed comprised of food system by-products/co-products (rich in P and K; identified) and low use of inorganic fertilizers in aquaponics may draw-down planetary health boundaries transgressions, most notably the climate change, biogeochemical cycles (N, P flows), land cover change, and freshwater use.

Czech name

—

Czech description

—

Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

—

OECD FORD branch

40103 - Fishery

Project

<a href="/en/project/QK22010177" target="_blank" >QK22010177: Optimalisation of supplemental feeding and management of pond aquaculture</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2025

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Aquaculture

ISSN

0044-8486

e-ISSN

1873-5622

Volume of the periodical

599

Issue of the periodical within the volume

neuvedeno

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

13

Pages from-to

nestránkováno

UT code for WoS article

001402986900001

EID of the result in the Scopus database

2-s2.0-85215104056