dc.contributor.author | Dayaratne, Pauline | |
dc.date.accessioned | 2008-08-07T13:40:12Z | |
dc.date.issued | 1986 | |
dc.identifier.issn | 0333-2594 | |
dc.identifier.uri | http://hdl.handle.net/11250/115152 | |
dc.description.abstract | The present paper describes the otolith structure and the
ring deposition pattern in 0-group sprat (Sprattus sprattus).
This is compared with that of Sardinella from tropical
waters. Age was estimated by using the primary growth rings in
the otoliths and the estimated age was used to calculate the
spawning time and to estimate growth.
Otolith structure and ring deposition were found to be
similar in sprat and Sardinella. In sprats, the number and
the thickness of the rings in the nuclear region seemed to vary
with the time of spawning. This indicated a difference in the
age of metamorphosis of sprat larvae. In Sardinella, however,
the period of metamorphosis was shown to be a species-specific
characteristic.
Back-calculated birth dates of sprat generally suggested a
protracted spawning from February to July with a peak in April
- June. Estimated spawning in Nordfjord (west Norway) is confirmed
by the known spawning curves. The calculated spawning
for other locations too, in genereal agrees well with the known
spawning.
The resulted growth estimates of sprat with K = 0.82 corresponds
to previous estimates. The results (growth and birth
dates) verify the daily periodicity of rings. The similarity of
the otolith structure of sprat to that of Sardinella and
herring (Clupea harengus) also indirectly validates the hypothesis
that the rings are formed daily. | en |
dc.format.extent | 712439 bytes | |
dc.format.mimetype | application/pdf | |
dc.language.iso | eng | en |
dc.publisher | Havforskningsinstituttet | en |
dc.relation.ispartofseries | Flødevigen rapportserie | en |
dc.relation.ispartofseries | 1, 1986 | en |
dc.title | A comparison of primary growth rings in otoliths from Sprattus sprattus from Norway and Sardinella spp. from Sri Lanka. In: Flødevigen rapportserie no 1, 1986 | en |
dc.type | Research report | en |
dc.source.pagenumber | 23-47 | en |