were measured (otolith
length - OL) and photographed in pairs in a way that both sides were visible.
5 megapixels of each otolith
section were obtained under transmitted light using a stereoscopic microscope Stemi DV4 (Carl-Zeiss) fitted with a Cannon[TM] Power Shot G6 digital camera.
Data on length and width were registered for each otolith
through their observation in a stereoscopic microscope with a graduated ocular lens.
Morphological indices and otolith
microstructure of Atlantic croaker, Micropogonias undulatus, as indicators of habitat quality along an estuarine pollution gradient.
Their chemical composition affords the possibility of environmental reconstruction that, when matched with otolith
biochronologies, can allow an individual fish to be placed retrospectively within time and space throughout its life (Campana and Thorrold 2001:37).
For salmon migration, theres still a way to go: now that they have shown the approach has potential, in order to apply the approach, the team will need to create tools to explore the detailed data from otoliths
microchemistry has been successfully applied to the study of small coastal pelagic fish using transitional environments (Kimura et al.
The theoretical basis behind stock identification that is based on otolith
chemistry is that otoliths
are deposited at, or very close to, oxygen isotopic equilibrium with ambient seawater and thus scientists can create a record of the environmental changes that an individual fish experiences through time (Gao et al.
The keys to Llopiz's research are tiny calcium carbonate stones, called otoliths
, that grow from birth in fishes' heads.
The objective of this study was to compare the feasibilities and precisions of age estimations of these two loaches using five different structures which were scale, otolith
, vertebra, opercular bone and cleithrum.
We recorded the presence of fish by identifying scales, otoliths
, and pharyngeal teeth in the sample.
3B) is as follows: Roughly triangular, the edge of dorsal is smooth, with one slight gap at the posterior end; the ventral edge is irregularity with two distinct protuberances on the ventral edge, the anterior of otolith
incline to the ventral slightly.