Abstract
AbstractIn this study, we explored the feasibility of using the beaks of the African cuttlefish Sepia bertheloti for age estimation and growth analysis. The rostrum sagittal section (RSS) of the lower beak was the most suitable region in the species. It was applied in samples caught off Morocco and Guinea-Bissau between June 2018 and January 2020. A maximum life expectancy of around 14 months was observed (specifically 419 days for cuttlefishes from Morocco and 433 from Guinea-Bissau). The males presented greater longevity, as the maximum age of the females was between 9 and 11 months. Sepia bertheloti showed a negative allometric growth; however, the exponential model better describes each population growth. By sexes, the males of both locations followed an asymptotic growth model while the females exhibited a non-asymptotic growth. The growth rates were different between locations, with the highest values in Guinea-Bissau. The males, in turn, grew faster for both study locations. In Guinea-Bissau, these growth differences were influenced by the hatching season since individuals born between autumn and winter were the fastest-growing. Samples from Morocco did not show growth differences between the hatching season and other seasons. These results indicate that the RSS of lower beaks are suitable for estimating the age, growth pattern, and population structure of Sepia bertheloti.
Funder
Universidad de Las Palmas de Gran Canaria
Universidad de las Palmas de Gran Canaria
Publisher
Springer Science and Business Media LLC
Subject
Ecology,Aquatic Science,Ecology, Evolution, Behavior and Systematics
Reference74 articles.
1. Akaike H (1974) A new look at the statistical model identification. IEEE Trans Auto Con 19(6):716–723
2. Almonacid-Rioseco EI (2006) Contribución a la ecología de Sepia officinalis (Cephalopoda: Sepiidae) en Gran Canaria, Doctoral dissertation
3. Ama-Abasi D, Akpan I (2008) Elemental concentration and size relationship in African cuttlefish Sepia bertheloti, from the coastal waters of Qua Iboe River, Nigeria. En: 22nd Annual Conference of the Fisheries Society of Nigeria (FISON), 12–16 Nov 2007, Kebbi, Nigeria, 245–249
4. Arístegui J, Barton E, Álvarez-Salgado X, Santos PA, Figueiras F, Kifani S, Hernández-León S, Mason E, Machú E, Demarcq H (2009) Sub-regional ecosystem variability in the Canary Current upwelling. Prog Ocea 83:33–48
5. Arkhipkin A (1996) Geographical variation in growth and maturation of the squid Illex coindetii (Oegopsida, Ommastrephidae) off the north-west African coast. J Mar Bioll Assoc UK 76:1091–1106