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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

40103 - Fishery

Projekt

<a href="/cs/project/QK22010177" target="_blank" >QK22010177: Optimalizace přikrmování a managementu rybniční akvakultury</a><br>

Návaznosti

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

Rok uplatnění

2025

Kód důvěrnosti údajů

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

Název periodika

Aquaculture

ISSN

0044-8486

e-ISSN

1873-5622

Svazek periodika

599

Číslo periodika v rámci svazku

neuvedeno

Stát vydavatele periodika

NL - Nizozemsko

Počet stran výsledku

13

Strana od-do

nestránkováno

Kód UT WoS článku

001402986900001

EID výsledku v databázi Scopus

2-s2.0-85215104056