Size at hatching and incubation period of Sympterygia bonapartii (Müller & Henle, 1841) (Chondrichthyes, Rajidae) bred in captivity at the Temaiken Aquarium

Abstract

Two mature Sympterygia bonapartii held in captivity laid a total of 136 egg cases, 33 of them were incubated at constant temperature (16Á5°C), salinity (36) and photoperiod (12L:12D). The hatching rate was 100%. Juvenile fish hatched after 135 AE 10 days (mean AE S.D.) and the mean total length, disc width and mass at hatching were 140 mm, 86 mm and 15Á1 g respectively.

Morphology and dynamics of male gametogenesis in Sympterygia bonapartii (Chondrichthyes, Rajidae) from Northern Patagonia

“…Our results show that the length and hardening of the claspers are not only related to the macroscopic aspect of the genital organs, but it also agrees with the histological events (spermatogenesis and spermiogenesis) that occur inside the testis, thus sustaining the conception that length growth and hardening of the claspers are a valid and simple criteria to determine maturity on board, at least for S. bonapartii. The size range observed in S. bonapartii is consistent with those reported by other authors for the same species (Mabragaña et al, 2002;Oddone & Velasco, 2004;Cousseau et al, 2007;Jañez & Sueiro, 2007;Basallo & Oddone, 2014). Likewise, the seasonal frequency of maturity stages here observed, does not differ from previous reports regarding to S. bonapartii for the El Rincón salt marsh area, near the Bahía Blanca estuary (Mabragaña et al, 2002).…”

Morphological study of the oviductal gland in the smallnose fanskate Sympterygia bonapartii (Müller and Henle, 1841) (Chondrichthyes, Rajidae)

“…Females are oviparous and use the Bahía Blanca estuary as a breeding and nursery area during spring and summer (Cousseau and Perrotta, 1998). Its biology is poorly known and only the basic aspects of reproductive features, such as length at first maturity, sexual dimorphism, size at hatching and some laying areas, are known (Mabragaña et al, 2002;Oddone and Velasco, 2004;Jañez and Sueiro, 2007).…”

First observations on captive hatching and incubation period of the yellow‐nose skateDipturus chilensis(Rajiformes: Rajidae), from the South‐Eastern Pacific Ocean

“…In South America, direct observations on incubation period and L 0 of batoids have been reported only in Sympterygia acuta Garman 1877, S. bonapartii Müller & Henle 1841, and Zapteryx brevirostris (Müller & Henle 1841) (Gonzalez, ; Jañez & Sueiro, ; Oddone & Vooren, ). A number of authors have provided estimates but not empirical data of these and other life‐history traits of D. chilensis (Licandeo & Cerna, ; Licandeo et al, ).…”