1. Life history strategy of sandy sprat Hyperlophus vittatus (Clupeidae): a comparison with clupeoids of the Indo-Pacific and southern Australia.
- Author
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Rogers, P. J. and Ward, T. M.
- Subjects
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GALAXIAS fisheries , *CLUPEIDAE , *SPRAT , *CLUPEIFORMES , *FISH reproduction , *MORTALITY , *AQUATIC resources , *FISHERY sciences - Abstract
The life history strategy of sandy sprat (whitebait) Hyperlophus vittatus was compared to those of other clupeoids found in the Indo-Pacific and southern Australia. Hyperlophus vittatus is a small (100 mm, fork-length, FL) pelagic species that spawns in inshore waters of southern Australia. The average growth rate for larvae (20.1–27.6 mm, total length, TL) inside the Coorong Lagoon was 0.12 mm day−1. Von Bertalanffy growth parameters were k = 1.83 year−1 and L∞ = 78.10 mm and the oldest fish was ∼4 years of age. Males and females attained 50% sexual maturity at 59 and 58 mm FL, respectively, and all individuals were sexually mature at lengths ≥75 mm, at ∼1.5 years of age. Macroscopic gonad staging showed the spawning season extended from October to February (spring and summer) and peaked during November. Mean egg densities were highest between September and November. Females produced batches of pelagic eggs at a mean frequency of 5 days and batch fecundities ranged between 743 and 5600 hydrated oocytes. The life history of H. vittatus is similar to those of larger, iteroparous clupeoids that occur in southern temperate Australian waters, e.g. sardine Sardinops sagax and Australian anchovy Engraulis australis, and dissimilar to those of small tropical clupeoids and the sympatric blue sprat Spratelloides robustus, which is semelparous. [ABSTRACT FROM AUTHOR]
- Published
- 2007
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