The reproductive ecology of Loligo squids (Cephalopoda: Myopsida) in Lusitanian zoogeographical province

13 pages, 9 figures, 5 tables, supplementary material https://doi.org/10.1016/j.rsma.2025.104506.-- Data availability: Data will be made available on request

Analysis of the temporal and spatial distribution of 686 records of egg masses and egg mass groups from (i) recreational divers and posted in the various public media, (ii) scientific survey data collected during research programs and (iii) publications in peer-reviewed literature plus published and unpublished information on the seasonality of the occurrence of mature females, demonstrated that the reproduction of Loligo squids occurs throughout the Lusitanian zoogeographical province all year round with varying seasonal peaks. This may be due to high phenotypic plasticity, with the life cycle adapting to local conditions, or the existence of small discrete stock units related to individual water features. In warmer and relatively productive waters the spawning peak is more extended, and percentage of mature females in catches is lower In the Mediterranean the peak of occurrence of both mature females and spawned eggs gradually shifts to earlier dates from the west to the east, which is consistent with respective changes of the earlier peak of productivity. There is little or no gap between peak of occurrence of mature females and peak of the egg mass records. Spawning grounds of L. vulgaris extend in the Mediterranean area much deeper than thought before and they extend from 3 m to 550 m. Egg masses were reported by recreational scuba divers from deeper locations in the central Mediterranean than in other areas. Loligo forbesii egg masses were found between 170 and 720 m

Female maturity data were collected during the Eurosquid Projects (EEC research programmes FAIR, contract no. MA 1.146 and FAIR-CT96–1520). We thank Lucia Coelho, Pedro Andrade, Pilar Sanchez, Angel Guerra, Helen Martins, Drosos Koutsoubas, Christos Arvanitidis and Filipe Porteiro who collected some of the Eurosquid datasets. FÁF-Á was supported by a Beatriu de Pinós fellowship from Secretaria d’Universitats i Recerca del Departament de Recerca i Universitats of the Generalitat de Catalunya (Ref. BP2021 00035) and the Spanish government through the “Severo Ochoa Center of Excellence” accreditation (CEX2019–000928-S). Samples from the Balearic Islands were collected within the Medits surveys and the National Programme of collection, management and use of data in the fisheries sector and support for scientific advice regarding the Common Fisheries Policy, co-funded by the IEO and the EU through the European Maritime and Fisheries Fund (EMFF)

Peer reviewed