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1.
J Fish Biol ; 103(2): 439-442, 2023 Aug.
Article in English | MEDLINE | ID: mdl-37148473

ABSTRACT

We report the first case of partial albinism in the Critically Endangered angelshark, Squatina squatina. The encounter with this specimen took place while SCUBA diving on the beach of Tufia, located on the east coast of the island of Gran Canaria on 2 April 2021. This is also the first confirmed finding of an albino elasmobranch specimen in the Canary Island archipelago.


Subject(s)
Albinism , Piebaldism , Sharks , Animals , Spain
2.
J Fish Biol ; 94(6): 857-864, 2019 Jun.
Article in English | MEDLINE | ID: mdl-30887506

ABSTRACT

In this study, we used a historical collection of photographs taken by recreational fishers from 1940 to 2014, at the island of Gran Canaria, to show both a significant decrease in the mean total length of Epinephelus marginatus and a concurrent change in the composition of captures. Before 1980, the mean total length of fish caught and photographed was c. 100 cm, while after 2009 this was typically < 40 cm. Before 1980, the predominant captured species was E. marginatus (an apex predator), but currently the majority of catches are of omnivorous species, in particular the parrotfish, Sparisoma cretense and seabreams Diplodus spp. Overall, integration of these results indicates a qualitative and quantitative variation in captures of recreational fishers, probably as a sign of change in ecological balances and the overfished status of many target species.


Subject(s)
Conservation of Natural Resources , Fisheries/history , Perciformes/physiology , Animals , Biodiversity , Ecology , Fishes/anatomy & histology , Fishes/physiology , History, 20th Century , History, 21st Century , Islands , Perciformes/anatomy & histology , Perciformes/growth & development , Spain
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