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Book (series)Mediterranean coastal lagoons: sustainable management and interactions among aquaculture, capture fisheries and the environment 2015
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No results found.The Mediterranean region hosts around 400 coastal lagoons, covering a surface of over 641 000 ha differing in both their typology and use. Fisheries and various forms of aquaculture have been traditionally carried out in Mediterranean coastal lagoons since ancient times and are part of the cultural heritage of the region. Traditional lagoon management linked to extensive aquaculture and fish harvesting has certainly contributed, over time, to preserve these peculiar ecosystems, although much of the coastal lagoon areas have progressively disappeared due to land reclamation and other uses. Recently, coastal lagoons have become a relevant environmental concern: land claiming, pollution and the lack of management, among other factors, have strongly modified both the structure and functioning of these sensitive coastal ecosystems. In particular, the management of traditional aquaculture and capture fisheries activities has been identified as the main instrument to maintain lagoons’ ecolog ical features and to prevent the degradation of their sensitive habitats, both from an environmental and socioeconomic point of view. To guarantee the sustainability of aquaculture and capture fisheries in lagoons, proper management plans should be established so as to ensure the preservation of both biodiversity and local knowledge. This should also be considered as a fundamental pillar for any programme aiming at the preservation and restoration of lagoons’ environment. -
Book (series)Preliminary assessment for the shrimp fisheries of the Negombo Lagoon (Sri Lanka). 2000
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No results found.The Negombo Lagoon has an area of 3 164 hectares and is situated some 40 km north of Colombo. It is part of a much larger Muthurawajawela Marsh-Negombo Lagoon coastal wetland. Apart from at the single narrow opening to the sea at its northern end, the water depth within the lagoon is less than 2 m. Six principal gears are used for catching shrimp inside the lagoon. Trammel nets are the most common, which along with cast nets are operated across the central portion of the lagoon. Stake nets are u sed immediately inside the entrance. Around the perimeter, lagoon seines (drag nets) and brush pile are the common gears. Fyke nets are also used at the southern end of the lagoon. Outside the lagoon, nonmechanized shrimp trawlers are operated north of the entrance, while mechanized shrimp trawlers are used 5 - 10 km to the south. The estimated catch from all gears operated inside the lagoon in 1997 was 613 t of shrimp and 1 044 t of others (mostly fish). The production from trawlers operated ou tside the lagoon was 270 t of shrimp and 239 t of others. Fourteen species of shrimp were identified, with six of these being major contributors to the catches. Penaeus indicus and to a lesser extent, P. semisulcatus were the most important in the trammel net and cast net catches. P. indicus was also the main species from brush piles. The stake nets set at the entrance caught mainly Metapenaeus dobsoni and M. moyebi. The latter were the major component of the catches with lagoon seines. The othe r important species caught in the lagoon was M. elegans. The main species in the trawl catches were M. dobsoni and Parapenaeopsis coromandelica. The former was the only major contributor to both the lagoon and outside catches. P. indicus and P. semisulcatus were relatively scarce in the trawl catches. Estimates of the growth and mortality parameters for each species are provided. Cash flow analyses are also reported in respect to base case fishing units for each gear type.......
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