Browsing by Author "Ruano, Francisco"
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- ABUNDANCE, DISTRIBUTION AND POPULATION STRUCTURE OF THE COMMON COCKLE Cerastoderma edule (Linnaeus, 1758) IN RIA DE AVEIRO, PORTUGALPublication . Maia, Francisco; Ruano, Francisco; Gaspar, Miguel; Instituto Português do Mar e da Atmosfera, I.P.The common cockle (Cerastoderma edule) is currently the most important shellfish resource exploited in Ria de Aveiro. In recent years, surveys have been conducted by the Portuguese Institute of the Sea and Atmosphere to provide data on stock status for management purposes. The present work presents the results of the 2019 cockle survey, as well as the stock trends over the years. Results revealed that Cerastoderma edule is well established in all fishing areas of the Ria de Aveiro. The major cockle beds were found in Cale da Moacha (1951.0 g/m2 at 2.5 m depth), Mira Channel (1519.4 g/m2 at 3.4 m depth) and Ílhavo Channel (1192.8 g/m2 at 2.0 m depth). These three production areas were responsible for about 60% of the total cockle biomass caught. However, the cockle fishing yields were still remarkably lower than those registered in the 2007 survey, which may compromise the sustainability of the stocks and seriously jeopardize future catches and incomes
- NOTE OF A PATHOLOGICAL STUDY OF THE COPEPOD PARASITE Nicothoë astaci IN EUROPEAN LOBSTER, Homarus gammarusPublication . Ruano, Francisco; Monteiro, Luísa; Instituto Português do Mar e da AtmosferaThe occurrence of an infestation of European lobsters by the copepod parasite Nicothoe astaci is reported for the first time in Portugal. A short description of the morphology of the parasite is done. Pathogenic analysis of the host reveal large eroded areas of gill filaments with necrotic scars deep into the gill axis, caused by the parasite. The internal organs show an empty digestive tract, with a discoloured hepatopancreas. A normal epidermis reveals an intermolt stage and the gonads shows a female in maturation. Due to the heavy infestation and its weak condition, the host was rejected for sale. The available material and the lack of recorded information about the stocks of this species, does not allowed getting a correct perception on the prevalence of this disease in wild populations.
- Preliminary studies on the lifecycle of Catostylus tagi: differentiation between female and male at morphological levelPublication . Lisboa, Raquel; Mascarenhas, Paulo; Gil, Fátima; Ruano, Francisco; Ladeira, Carina; Morais, ZildaJellyfish has been proposed as a source in drug development to treat diseases such as arthritis and hypertension. Catostylus tagi, the sole European Catostylidae, is an edible Scyphozoa which occurs in summer at Tagus and Sado estuaries. Some aspects of its application in health sciences have already been studied. This assay aimed to investigate its sexual differentiation by morphological characteristics.