Preliminary estimates of the age and growth of immature smooth oreo Pseudocyttus maculatus Gilchrist 1906 (Oreosomatidae) in the Falkland Islands region of the South Atlantic

George, MJA and Jackson, George D and Green, C. P. and Robertson, S. G. (1998) Preliminary estimates of the age and growth of immature smooth oreo Pseudocyttus maculatus Gilchrist 1906 (Oreosomatidae) in the Falkland Islands region of the South Atlantic. Polar Biology, 19 (5). pp. 330-335. ISSN 0722-4060

Full text not available from this repository.

Abstract

Sectioned otoliths were used to estimate the age of 29 specimens of the smooth oreo (Pseudocyttus maculatus Gilchrist 1906) from the Falkland Islands region of the South Atlantic. This represents the first ageing study of this species in this region of the world. All specimens were immature (sub-adults), the largest having a maximum total length of 347 mm. Growth increments were observed in sectioned otoliths and assumed to be annual in periodicity. The maximum age estimate of individuals in this study was 20 years and the form of somatic growth was similar to previous research on this species from Australian waters. The otolith microstructure consisted of an inner, mostly opaque zone with wide increments followed by an outer, mostly translucent zone with narrower increments. It is suggested that these zones correspond to the two growth phases in the life history of this species, namely the pelagic juvenile phase (opaque zone) and the demersal sub-adult/adult phase (translucent zone).

Item Type:
Journal Article
Journal or Publication Title:
Polar Biology
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/1100
Subjects:
ID Code:
128723
Deposited By:
Deposited On:
05 Nov 2018 14:54
Refereed?:
Yes
Published?:
Published
Last Modified:
12 Aug 2020 08:13