Trophic functioning of integrated rice-fish farming in Madagascar: Insights from stable isotopes (δ13C & δ15N)

Mortillaro Jean-Michel, Dabbadie Lionel, Raminoharisoa Andoniaina E., Paradis Anaïs, Martel Philippe, Andriamarolaza Rija, Raliniaina Modestine, Mikolasek Olivier, Aubin Joël. 2022. Trophic functioning of integrated rice-fish farming in Madagascar: Insights from stable isotopes (δ13C & δ15N). Aquaculture, 555:738240, 7 p.

Résumé : Trophic dynamics of integrated rice and fish farming (IRF) systems were studied in irrigated rice plots stocked with common carp in Madagascar. Fish feeding behavior was assessed by analyzing stable carbon and nitrogen isotopes of fish and natural feed sources. Stable isotope signatures of 45-day-old carp fry introduced into rice plots (δ13C = −18.8‰ ± 0.5‰, δ15N = 9.3‰ ± 0.6‰) revealed that they had been fed chicken egg yolk and corn meal, in accordance with local practices. However, after a 100-day growing period in experimental rice plots, 13C and 15N depletion was observed for 145-day-old carp, indicating a change in feeding sources. Under extensive conditions, common carp that fed on rice roots, sediments and suspended particulate organic matter (i.e. plant debris and detritus) had a larger trophic niche (3‰2) than 45-day-old carp (1.2‰2). Overall, common carp feeding behavior and the trophic food web in the IRF system suggest that increasing natural productivity through organic fertilization will enhance ecological intensification of both rice and fish production.

Mots-clés Agrovoc : Oryza, rizipisciculture, carpe, niveau trophique, chaîne alimentaire, isotope stable

Mots-clés géographiques Agrovoc : Madagascar

Mots-clés libres : Rice-fish farming, Common carp, Food webs, Stable isotopes, Trophic niche partitioning

Classification Agris : M40 - Écologie aquatique
F07 - Façons culturales
M12 - Production de l'aquaculture

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Agences de financement hors UE : Agence Nationale de la Recherche

Auteurs et affiliations

• Mortillaro Jean-Michel, CIRAD-PERSYST-UMR ISEM (MDG) ORCID: 0000-0003-1911-9338 - auteur correspondant
• Dabbadie Lionel, FAO (ITA) ORCID: 0000-0003-0004-6300
• Raminoharisoa Andoniaina E., FOFIFA (MDG)
• Paradis Anaïs, APDRA Pisciculture paysanne (MDG)
• Martel Philippe, APDRA Pisciculture paysanne (MDG)
• Andriamarolaza Rija, APDRA Pisciculture paysanne (MDG)
• Raliniaina Modestine, FOFIFA (MDG)
• Mikolasek Olivier, ISEM (FRA)
• Aubin Joël, INRAE (FRA)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/600756/)

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