First record of albinism in the smooth dogfish Mustelus Schimitti Springer, 1939 (Carcharhiniformes - Triakidae) from Southern Brazil

Abstract

This paper reports on a subadult male specimen of the smooth dogfish, Mustelus schimitti, caught in the continental shelf of Rio Grande Sul, during winter of 1993, which exhibited the characteristics of total albinism.

Abnormal embryos of sharpnose sharks, Rhizoprionodon porosus and Rhizoprionodon lalandii (Elasmobranchii: Carcharhinidae), from Brazilian coast, western South Atlantic

“…Study cases of abnormalities in elasmobranchs are mostly focused on partial or complete albinism and leucism (e.g. Joseph, 1961;Nakaya, 1973;Teixeira & Araújo, 2002;Ben Souissi et al, 2007;Ball et al, 2013) and on morphological body deformities related, for instance, to incomplete fin-head fusion in batoids (skates and rays) and skeletal abnormalities of the vertebral column, recorded since 1642 (Driggers et al, 2012). Most published information on prenatal abnormalities of elasmobranchs were produced during the last 30 years and, there are a few studies if compared to land vertebrates, probably due to the relative unavailability of specimens of sharks and rays until recent times, the nature of these abnormalities, resulting in prenatal death, and, in a general view, the remarkable increase of interest to investigate other biological and anatomical parameters.…”

“…Several elasmobranch taxa were reported exhibiting some skeletal anomaly during embryonic development (Ford, 1930;Gopalan, 1971;Goto et al, 1981;Heupel et al, 1999;El Kamel et al, 2009;Delpiani et al, 2011;Galván-Magaña et al, 2011;Hevia-Hormanzábal et al, 2011;Mejia-Falla et al, 2011;Driggers et al, 2012;Guida et al, 2013;Muñoz-Osorio et al, 2013;Wagner et al, 2013). Brazilian studies on elasmobranch prenatal body abnormalities are restricted to some case reports based on few specimens (Gomes et al, 1991;Rosa et al, 1996;Teixeira & Araújo, 2002;Mancini et al, 2006;Bornatowski & Abilhoa, 2008). The most comprehensive Brazilian data available were provided by Ribeiro-Prado et al (2008) describing different anomalies in six batoid species from southern Brazil.…”

A case of albinism in Batrachoides surinamensis (Batrachoidiformes: Batrachoididae) from north-eastern Brazil

“…There are several reports of instances of albinism in fish (e.g. Sazima & Pombal Jr, 1986;Teixeira & Araújo, 2002;Bottaro et al, 2005;Brito & Caramaschi, 2005;Reum et al, 2008).…”

First record of a single-clasper specimen of Pseudobatos percellens (Elasmobranchii: Rhinopristiformes: Rhinobatidae) from the Caribbean Sea, Venezuela

“…Documented cases of abnormalities in elasmobranchs worldwide are most often reported for sharks (Atz 1964, Heupel et al 1999, Teixeira and Góes de Araújo 2002, Jones et al 2005, Saïdi et al 2006, Bottaro et al 2009, Delpiani et al 2011, Galván-Magaña et al 2011, Muñoz-Osorio et al 2013, Wagner et al 2013, Ehemann et al 2016, Becerril-García et al 2017, Lamarca et al 2017, Capapé and Ali 2017 and rarely for skates and rays. Nevertheless, the number of records of anomalous defects in batoid fish specimens have increased over the past decade, including morphological anomalies (Escobar-Sánchez et al 2009, Mejía-Falla et al 2011, Ramírez-Hernández et al 2011, Torres-Huerta et al 2015, albinism (Sandoval-Castillo et al 2006, Ben-Souissi et al 2007, Ball et al 2013, and dicephalic embryos (Castro-Aguirre and Torres-Villegas 1979, Bornatowski andAbilhoa 2009, Guida et al 2014).…”