Olga Ayza

Dirección General de Protección de la Naturaleza. Gobierno de Canarias · Servicio de Biodiversidad

Fourteen species of marine invertebrates are recorded for the first time for the the Canary and Cabo Verde archipelagos: four jellyfish, a nemertean, an equiurid, four mollusks, a crustacean, a mite, an echinoderm and a salpa. All of them include illustrations of the live specimens and information on the localities where they have been observed.

Thirteen species of marine invertebrates are recorded in the Canary archipelago for the first time: two hydrozoans, three isopods, two bryozoans, four sea squirts, one pyro-so mid and one salp. In addition, new data from other invertebrate species for which there is little information in the Canaries are provided. All of them include illustrations...

During the past 20 years, experimental cruises have been conducted around the Canary Islands (North-West Africa) to investigate the biodiversity of the deep-sea ecosystem and to explore new fisheries resources. Although pandalid shrimps were shown to be very abundant in this region, information is lacking regarding the best fishing method for catch...

The aim of the study was to analyse the size, growth and size at maturity of Nephrops norvegicus in two areas off the Portuguese coast. Samples were collected between September 2006 and January 2007. A total of 2081 individuals ranging between 25 and 88 mm carapace length were collected, measured and sexed. The estimated growth parameters were L∞ =...

Diplodus vulgaris is characterized by a rudimentary hermaphroditism, with a low proportion of protandrous sex reversal. Male : female ratio is slightly unbalanced in favour of females (1 : 1.17), although no significant difference of the relation 1 : 1 was found. Both sexes have similar size distributions, with females predominating in larger sizes...