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Recreational shellfish harvesting on a sandy beach in the Algarve coast (southe...
Pereira, Fábio; Carvalho, André N.; Piló, David; Vasconcelos, Paulo; Gaspar, MiguelThis study aimed to characterise the recreational harvesting of wedge clams (Donax trunculus) in the Algarve coast (southern Portugal) and estimate its annual catches by recreational harvesters (RHs). For this purpose, 50 harvesting surveys were performed along the sandy intertidal during one-year (May 2022 - April 2023), roughly on a weekly basis during suitable tidal ranges (≤ 1.0 m). Overall, RHs were gender...
Recreational harvesting of the wedge clam (Donax trunculus) in southern Portuga...
Sordo, Laura; Vasconcelos, Paulo; Piló, David; Carvalho, André N.; Pereira, Fábio; Gaspar, MiguelThis study was the first attempt to characterize the recreational harvesting of the wedge clam (Donax trunculus). For this purpose, 403 face-to-face interviews were performed in the summers of 2018 and 2019 in southern Portugal. The majority of the harvesters frequented the selected beaches during holidays and collected wedge clams as a hobby for an appetizer. The respondents reported an inter-annual variation ...
Occurrence, infestation rate, and spatiotemporal distribution of the African pe...
Santos, Agatha C. N.; Vasconcelos, Paulo; Pereira, Fábio; Piló, David; Carvalho, André N.; Gaspar, MiguelThe present study aimed to analyze the occurrence and prevalence, infestation rate and intensity, host-guest colonization pattern, morphometric relationships, and spatiotemporal distribution of the African pea crab (Afropinnotheres monodi) inhabiting the shell of Mediterranean mussels (Mytilus galloprovincialis) from the Algarve coast and Ria Formosa lagoon (southern Portugal). Sampling campaigns were performed...
Morphometric relationships, relative growth and roe yield of the sea urchin (Pa...
Nicolau, Lídia; Vasconcelos, Paulo; Machado, Inês; Pereira, Fábio; Moura, Paula; Carvalho, André N.; Gaspar, MiguelSea urchin (Paracentrotus lividus) populations from the northwestern (Carreco) and southwestern (Aljezur) coasts of Portugal were surveyed to analyse and compare their morphometric relationships, relative growth (isometry vs. allometry) and roe yield. Specimens were hand-collected from intertidal rock pools and sampled monthly during two consecutive years (November 2010-November 2012). Overall, 1220 P. lividus ...
Hand dredging for the wedge clam (Donax trunculus) in the Algarve coast (southe...
Nicolau, Lídia; Vasconcelos, Paulo; Carvalho, André N.; Pereira, Fábio; Piló, David; SORDO, LAURA; Gaspar, MiguelThis study aimed to characterize the catches, quantify fishing yield, bycatch and discards, and also estimate damage and mortality rates using hand dredges with two different mesh sizes (20 and 25 mm) for harvesting the wedge clam (Donax trunculus). A total of 160 tows were performed in Lota Beach and Armona Island in the Algarve coast (southern Portugal). Overall, were caught 12,319 individuals (3985 in Lota B...
Shell morphology, morphometric relationships and relative growth of three topsh...
Vasconcelos, Paulo; Santos, Agatha C. N.; Pereira, Fábio; Moura, Paula; Carvalho, André N.; Gaspar, MiguelThis study analysed the shell morphology, morphometric relationships and relative growth in three topshell species (Phorcus lineatus, Phorcus sauciatus and Steromphala umbilicalis) collected in the Algarve coast (southern Portugal). A total of 1382 individuals were sampled (465 P. lineatus, 447 P. sauciatus and 470 S. umbilicalis) and all species comprised individuals with broad size and weight ranges. Morphome...
Size at sex change and reproductive cycle of the limpets Patella vulgata and Pa...
Vasconcelos, Paulo; Umapathy, Uthesh; Moura, Paula; Pereira, Fábio; Carvalho, André N.; Gaspar, MiguelThis study describes the reproductive cycle of the common limpet (Patella vulgata) and rough limpet (Patella ulyssiponensis) from the Algarve coast (southern Portugal). Individuals of both species were sampled monthly during two consecutive years, and subjected to gonad histology and calculation of the mean gonadal index (GI). Both species had balanced sex ratios (P. vulgata = 1M: 0.98F; P. ulyssiponensis = 1M:...