Search results for " Fish"

Aquaculture impact on benthic microbes and organic matter cycling in coastal Mediterranean sediments: a synthesis

2003

Microbial assemblages and organic matter composition as well as their response to the disturbance induced by mussel and fish-farm biodeposition were compared in several areas of the Mediterranean: La Spezia (Ligurian Sea), Gaeta (Tyrrhenian Sea), Cattolica (Adriatic Sea) and Cyprus (Levantine Sea), on both unvegetated and Posidonia bed sediments. In all systems investigated, organic matter (as biopolymeric carbon) accumulated in aquaculture impacted sediments. Among the main biochemical classes, lipids appeared to be a good tracer of aquaculture impact, especially in fish-farm sediments. Exoenzymatic activities displayed higher values in sediment beneath the cages, indicating faster organic…

Analysis of stable carbon and nitrogen isotopes as a tool for assessing the environmental impact of aquaculture: a case study from the western Medite…

2005

Stable carbon and nitrogen isotope ratios ( 13C/ 12 C and 15N/14 N) of in situ dominant primary producers and consumers were investigated to assess the impact on a natural ecosystem of a land-based fish farm along the south-western coast of Sicily (Italy). The putatively impacted area close to the farm along outfall was compared with other locations at increasing distances from the outfall. Carbon and mainly nitrogen stable isotopes revealed evidence of widespread aquaculture waste in the study site: benthic organisms collected in the impacted area showed more enriched δ 15N signatures than those at greater distances from the outfall, suggesting a large contribution of aquaculture waste to …

Growth of Mytilus galloprovincialis (mollusca, bivalvia) close to fish farms: a case of integrated multi-trophic aquaculture within the Tyrrhenian Sea

2009

A current practice of marine aquaculture is to integrate fish with low-trophic-level organisms (e.g. molluscs and/or algae) during farming to minimise effects of cultivation on the surrounding environment and to potentially increase economic income. This hypothesis has been tested in the present article experimentally, by co-cultivating fish and mussels (Mytilus galloprovincialis) in the field. Integrated multi-trophic aquaculture (IMTA) experiments were started in July 2004 by transplanting mussel seed at two depths (-3 and -9 m) within 1,000 m downstream to fish cages and at 1,000 m upstream from cages. Mussels were cultured in nylon net bags for 12 months and the growth recorded biometri…

Experiences of integrated mariculture in a southern Tyrrhenian area (Mediterranean Sea)

1999

To ascertain the potential for exploiting marine areas for mariculture, data on the cultivation of molluscs and fish in the open sea of the southern Tyrrhenian were collected from May 1994 to June 1995. The aims of this integrated study were to test simple breeding methods for molluscs and fish, to apply these to the practices employed by local fishermen and to experiment with the use of a cage system requiring a low level of investment. Crassostrea gigas (Thunberg) and Mytilus galloprovincialis (Lamarck) were cultivated on submerged long lines around cages used for cultivating Seriola dumerili (Risso) and Diplodus puntazzo (Cetti). S. dumerili specimens were placed in two cages and fed wit…

Using web-based information systems and stable isotopes analysis to investigate the trophic structure of a fish assemblage in a Mediterranean lagoon

2010

Fish diversity associated with gas platforms: Evaluation of two underwater visual census techniques

2007

Se estudiaron las comunidades ícticas asociadas con plataformas extractivas mediante dos técnicas de censos visuales submarinos: transectos y conteos de puntos móviles. Los datos se tomaron a cuatro profundidades en tres diferentes plataformas situadas en el Mar Jónico (Crotone, Italia). Se registraron un total de 25 especies de peces pertenecientes a 12 familias. Se observaron diferencias significativas entre ambos métodos de muestreo y las profundidades en cuanto a la estructura de la comunidad íctica, la riqueza de especies y la abundancia de peces. El promedio de peces registrado con el método de transectos siempre fue mayor que el registrado mediante puntos móviles, mientras que lo con…

Assessment of biochemical composition of experimental diets for aquaculture, containing plant meals as substitutes for fish meal.

2013

The Political Ecology of Small-scale and Artisanal Fisheries: Enclosures, Property and Conservation

2022

This article concentrates on some aspects of the political ecology of a specific portion of marine resource users, holders, and guardians – small-scale and artisanal fisheries (SSFs) – with the aim of exploring some of the struggles they are currently facing and how they are positioned vis à vis some of the solutions proposed to improve marine resources and ecosystems management and conservation. In particular, the article looks at the expansion of states’ sovereignty and private property to reduce unsustainable catches and at the establishment of marine and coastal protected areas as instruments that often fall short of sufficiently considering and respecting the livelihoods, culture, and …

The sustainability of the Sicilian seafood chain: Innovation, organizational models and value chain

2015

fisheries sector, organizational change, value chain, innovation To what extent and how the acquisition of new innovative processes can affect the structure and roles of the actors within the seafood sector chain? What are the possible effects along the entire value chain and on the distribution of this value to those who have contributed to generate it ? The proposed analysis aims to clarify some aspects of these complex issues whose implications may affect the future and the economic sustainability of the fisheries sector in Sicily. The related economic literature investigates the role of organizational change management on improving the performance of companies engaged in the launch of i…

The Family Business in the Fishing District of Mazara del Vallo. Critical issues and Dynamics

2016

This work-in-progress paper presents the early results of a survey aiming to understand the relationship between family firms and regional development in contemporary economic, by examining the negative effects of “family inertia” on the acquisition of dynamic capabilities necessary to enhance competitiveness and establish inter-firm cooperation strategies in family businesses in the context of an industrial district. Family firms are acknowledged for playing an important role in the creation, organization, and allocation of regional resources and in regional processes. Industrial districts are recognized as fertile fields for the development of inter-firm interrelations that may produce po…