The indicator estimates the scale of national aquaculture in terms of the number of active facilities, production volumes, and growth trends, with reference to the objectives set out in the 2021–2027 Strategic Plan for Aquaculture and in the Operational Programme of the European Maritime, Fisheries and Aquaculture Fund (EMFAF) 2021–2027. Italian aquaculture production recorded for 2023 amounts to 129,746 tonnes, of which 61% consists of molluscs and 39% of fish. Crustacean farming remains a marginal sector, with a production of only 5.4 tonnes. Exotic species account for 45% of total national production.

In 2023, Veneto remains the leading Italian region in terms of number of facilities (23%), while Emilia-Romagna ranks first for production volumes (25%). Five regions (Veneto, Emilia-Romagna, Friuli Venezia Giulia, Sardinia, and Apulia) host 68% of aquaculture facilities. Emilia-Romagna, Veneto, and Friuli Venezia Giulia are confirmed as the main production hubs and, together with Marche and Tuscany, account for 68% of national output. In most coastal regions, brackish/saline water resources prevail, with facilities located in transitional, coastal, and marine environments.

The indicator provides an estimate of the input and removal of nitrogen and phosphorus, respectively produced by farmed fish and cultivated mussels, in the coastal marine environment where aquaculture activities take place.
The balance between nutrient inputs from farmed fish and nutrient removal by molluscs allows the estimation, at the regional scale, of the net quantitative contribution of aquaculture to trophic processes along the Italian coastline.
At the national level, compared with the 2021–2022 biennium, 2023 shows a reduction in nitrogen and phosphorus inputs, but also a decrease in the removal of these nutrients due to a decline in the production of both marine fish and farmed mussels.
At the regional level, in Veneto, Emilia-Romagna, Abruzzo, Molise and Marche, nitrogen and phosphorus removal by mussels exceeds nutrient inputs from fish farming, owing to the presence of numerous mussel farming facilities and the absence of intensive fish farming activities.

This indicator reports national scale data on the surface area and number of maritime state concession areas for aquaculture use as well as on Allocated Zones for Aquaculture (AZA). AZAs are designated by the competent authority as “Priority Areas for Aquaculture”, meaning areas free from conflicts with other uses and with environmental conditions suitable to ensure sustainable production while minimizing environmental impacts.

In Europe, identifying new marine areas for aquaculture is one of the main objectives of the Strategic Guidelines for a more sustainable and competitive EU aquaculture for 2021–2030 (COM/2021/236), of the National Strategic Aquaculture Plans 2014–2020 and 2021–2027, and of the corresponding EMFF and EMFAF Operational Programs, under Regulations 508/2014/EU and 1139/2021/EU.

The identification of AZAs is also part of the Maritime Spatial Planning (MSP) framework established by Directive 2014/89/EU, transposed into Italian law by Legislative Decree 201/2016, which supports the sustainable growth of maritime economies through a coordinated, integrated, and cross-border approach within Maritime Spatial Management Plans. These aquaculture planning processes are also relevant to climate change adaptation strategies needed to mitigate medium- and long-term sector impacts.

Italy’s maritime space, between the coastline and the 12-nautical-mile limit, covers approximately 14 million hectares. Of this area, only 20,250 hectares are currently occupied by state concessions for aquaculture use, with around 96% (19,445 ha) allocated to shellfish farming and only 3.9% (805 ha) to marine fish farming. As of April 2024, AZAs have been designated in Tuscany, Marche, Emilia-Romagna, Veneto, and Friuli-Venezia Giulia, for a total area of about 29,633 hectares. Within AZAs, 8,739 ha are occupied by shellfish farming and 665 ha by fish farming.