Aspects of reproductive biology of the humpback smooth-hound shark (Mustelus whitneyi) off northern Peru
Adriana Gonzalez-Pestana
A D , Joanna Alfaro-Shigueto A B C and Jeffrey C. Mangel A C
A ProDelphinus, Calle Jose Galvez 780-e, 15074 Lima, Peru.
B Facultad de Biología Marina, Universidad Científica del Sur, Panamericana Sur, kilometro 19, 15067 Lima, Peru.
C Centre for Ecology and Conservation, College of Life and Environmental Sciences, University of Exeter, Penryn Campus Penryn, Cornwall, TR10 9FE, UK.
D Corresponding author. Email: adriana@prodelphinus.org
Marine and Freshwater Research 70(8) 1185-1188 https://doi.org/10.1071/MF18382
Submitted: 1 October 2018 Accepted: 19 December 2018 Published: 21 February 2019
Abstract
The humpback smooth-hound shark (Mustelus whitneyi) is one of the most captured shark species in the south-east Pacific and is classified as vulnerable, yet its reproductive biology has been poorly studied. The aim of this study was to increase our knowledge of the reproductive biology of the humpback smooth-hound shark. In all, 41 pregnant females, 386 macroscopically visible embryos in utero and 16 neonates were sampled off northern Peru. Pregnant females measured between 73- and 118-cm total length (TL) and the number of embryos per litter ranged from 6 to 18, with a mean of 10. Size at birth ranged between 21 and 22 cm TL. Litter size increased with the TL of the mother, yet this relationship was not strong (r2 = 0.36). The gestation period had a minimum duration of 7 months and a synchronous cycle in which birth occurred in September. The humpback smooth-hound shark is a placental viviparous elasmobranch. This study represents the most comprehensive research of the reproductive biology of the humpback smooth-hound shark, and is the first time the embryonic development is described for this species. These findings could contribute to the design and implementation of local management plans for this species.
Additional keywords: embryonic development, litter size, pregnancy, south-east Pacific.
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