New Zealand Journal of Marine and Freshwater Research abstracts
Batch fecundity and spawning frequency of southern blue whiting (Micromesistius
australis) in the southwest Atlantic Ocean
G. J. Macchi
Consejo Nacional de Investigaciones Científicas y Técnicas
(CONICET)
Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP)
Paseo Victoria Ocampo No. 1, CC. 175
7600 Mar del Plata
Argentina
email: gmacchi@inidep.edu.ar
M. Pájaro
O. C. Wöhler
Instituto Nacional de Investigación y Desarrollo Pesquero (INIDEP)
Paseo Victoria Ocampo No. 1, CC. 175
7600 Mar del Plata
Argentina
M. J. Acevedo
R. L. Centurión
D. G. Urteaga
Facultad de Ciencias Exactas
Universidad Nacional de Buenos Aires (UBA)
Int. Güiraldes 2620, Ciudad Universitaria
1428 Buenos Aires
Argentina
Abstract The reproductive biology of southern blue whiting
(Micromesistius australis) inhabiting waters of the southwest Atlantic
Ocean (52°–53°S and 57°–62°W) was studied through histological
analysis of the ovaries. During 2003, the spawning peak occurred at the beginning
of September south of the Malvinas Islands. Batch fecundity of this species
ranged from 35 000 (41 cm total length, TL) to 245 000 (62 cm TL) oocytes
and relative batch fecundity was 122 ± 43 (Mean ± SD, n
= 24) oocytes per gram somatic weight. The average proportion of mature females
with stage-0 post-ovulatory follicles was 0.25 for September 2003, which
indicated a spawning frequency of 4 days during the peak of the season. Large
females produced more egg batches than small spawners during the same period,
but no significant relationship was found between oocyte dry weight and female
size of southern blue whiting.
Keywords Micromesistius australis; Atlantic Ocean;
fecundity; spawning frequency
M04147; Online publication date 22 July 2005 Received 26 October 2004;
accepted 21 February 2005
New Zealand Journal of Marine and Freshwater Research, 2005, Vol. 39:
993-1000
0028-8330/05/3905-0993 © The Royal Society of New Zealand 2005
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