Browsing by Subject "Mediterranean sea"

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    Assessing the contribution to overfishing of small- and large-scale fisheries in two marine regions as determined by the weight of evidence approach
    (Elsevier, 2021-09-15) Cánovas Molina, Almudena; García Charton, José Antonio; García Frapolli, Eduardo; Ecología e Hidrología
    Overfishing is taking place all over the world threatening marine ecosystems’ health and associated livelihoods. Correctly identifying the drivers of overexploitation are crucial to guide effective fishery measures. In the present study the distinct contribution to overfishing of large-scale fisheries (LSF) and small-scale fisheries (SSF) in the Gulf of California and in the Mediterranean Sea has been compared. To accomplish the task, a weight of evidence approach has been applied based on a thorough literature review documenting overfishing. Results showed that both SSF and LSF shared responsibilities in overfishing in the two geographical locations considered, albeit with different contributions. In the Gulf of California, the weight of evidence revealed that overfishing was mainly driven by fishers engaged in SSF whereas in the Mediterranean, overfishing was mainly driven by LSF. In the Mediterranean, bycatch by LSF played a greater role than in the Gulf of California where, instead, a higher number of endemic overfished species were recorded. In order to attain fisheries sustainability some recommendations are given. In the Mediterranean, selective fishing practices and fishery policies that include input controls and catch limits are highly desirable. In the Gulf of California, the presence of governmental agencies and their services together with participatory management schemes should be reinforced in the region.
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    Molecular identification of Anisakis and Hysterothylacium larvae incommercial cephalopods from the Spanish Mediterranean coast
    (Elsevier, 2016-04-15) Picó-Durána, Gabriela; Pulleiro-Potela, Lorena; Abolloc, Elvira; Pascual, Santiago; Muñoz, Pilar; Sanidad Animal
    This study aims to investigate the occurrence of nematode larvae in commercial cephalopods in theWestern Mediterranean Sea. A total of 202 animals comprising 123 broadtail shortfin squid (Illex coinde-tii), 34 European squid (Loligo vulgaris) and 45 common octopus (Octopus vulgaris) were examined usingenzymatic digestion. A total of 31 larvae were isolated (prevalence: 14.6%) and identified using molecularanalyses which included PCR and sequencing of the ITS (ITS1-5.8S rDNA-ITS2) region. Phylogenetic treeinferred from ITS sequences yielded supported relationships for Anisakis (P: 12.2%) and Hysterothylaciumspecies (P: 4.1%). All parasites were found parasitizing I. coindetii and, as expected, A. pegreffii presentedthe highest prevalence (11.4%). A. physeteris was also found with a lower prevalence (1.6%) but confirmingthe role of the broadtail shortfin squid as paratenic host and, its potential host for anisakidosis transmis-sion. A hybrid larva between Anisakis simplex and A. pegreffi was also identified. All Anisakis larvae werefound within the visceral cavity; in contrast most of the Hysterothylacium larvae were isolated from themantle. A significant correlation was found between total nematode prevalence and depth, explained bythe presence of larger broadtail shortfin squids inhabiting deeper depths. Therefore, the results obtainedin the present study improve the knowledge of the occurrence of Anisakis and Hysterothylacium species inthe I. coindetii from the Spanish Mediterranean Sea highlighting the importance of considering I. coindetiias a potential hazard for humans if it is consumed raw or not well cooked and the need of further researchin other cephalopods.