Effects of temperature and salinity on the development and survival of the embryos and zoeae I from the southern surf crab Ovalipes trimaculatus (Brachyura: Portunidae)

MARTELLI, ANTONELA; BARÓN, PEDRO J.

ANAIS DA ACADEMIA BRASILEIRA DE CIENCIAS.

ACAD BRASILEIRA DE CIENCIAS

Lugar: Rio de Janeiro; Año: 2021

0001-3765

Ovalipes trimaculatus is a commercially fished portunid crab. However, has poorly information of their growth and development in captivity. This work analyzed the combine effects of different thermo-haline conditions on the length of development and survival of embryos (6, 10, 13, 15, 18, 22, 24 ⁰C x 30, 33 ?; 13 ⁰C x 26, 30, 33, 37 ?) and zoeae I (13, 18, 22 ⁰C x 30, 33 ?; 13 ⁰C x 26, 30, 33, 37 ?) of the southern surf crab O. trimaculatus from Nuevo Gulf?s (Patagonia, Argentina) populations. The relevant results shown that the mean length of embryogenesis decreased from 63 days to 19 days with increasing temperatures, but was not affected by water salinity. Mean embryonic survival was significantly lower at high temperatures tested than at other thermo-haline treatments. Also, it differed between salinity conditions. Both at 30 and 33?, the length of the Zoea I stage significantly varied between thermal treatments, being longer at 13⁰C. However, no zoeae I reared at 13 ⁰C survived at 37? and mean survival at 26? halved that of 30-33?. These experimental results might be used in the design of broodstock conditioning and zoeae I rearing, promoting their exploitation through aquaculture.