Otolith shape analysis as a tool for stock discrimination of forkbeard (Phycis phycis) in the Northeast Atlantic

Hydrobiologia ◽  
2014 ◽  
Vol 728 (1) ◽  
pp. 103-110 ◽  
Author(s):  
Ana Rita Vieira ◽  
Ana Neves ◽  
Vera Sequeira ◽  
Rafaela Barros Paiva ◽  
Leonel Serrano Gordo
Keyword(s):  
Shape Analysis ◽  
Otolith Shape ◽  
Otolith Shape Analysis ◽  
Northeast Atlantic ◽  
Stock Discrimination ◽  
Phycis Phycis

Otolith shape analysis as a tool for stock separation of horse mackerel (Trachurus trachurus) in the Northeast Atlantic and Mediterranean

2008 ◽  
Vol 89 (2) ◽  
pp. 159-166 ◽  
Author(s):  
Christoph Stransky ◽  
Alberto G. Murta ◽  
Jürgen Schlickeisen ◽  
Christopher Zimmermann
Keyword(s):  
Shape Analysis ◽  
Horse Mackerel ◽  
Trachurus Trachurus ◽  
Otolith Shape ◽  
Otolith Shape Analysis ◽  
Northeast Atlantic

Stock Discrimination Using Otolith Shape Analysis

1993 ◽  
Vol 50 (5) ◽  
pp. 1062-1083 ◽  
Author(s):  
Steven E. Campana ◽  
John M. Casselman
Keyword(s):  
Growth Rate ◽  
Shape Analysis ◽  
Gadus Morhua ◽  
Atlantic Cod ◽  
Otolith Shape ◽  
Otolith Shape Analysis ◽  
Stock Discrimination ◽  
The Difference ◽  
Highly Correlated ◽  
Species Specific

Otolith shape has long been known to be species specific, but recent reports have pointed to its value as an indicator of stock identity. To test this hypothesis, all three pairs of otoliths were sampled from 2349 Atlantic cod (Gadus morhua) collected on spawning grounds throughout the northwest Atlantic. Otolith shape was determined with Fourier analysis and combined with measures of otolith area and perimeter. There were highly significant differences in otolith shape among most of the cod samples, but shape also differed among ages, sexes, and year-classes. The sagittal otoliths (largest pair) provided slightly better stock discrimination than did the lapillar or asteriscal otoliths. The first discriminant function was highly correlated with both fish and otolith growth rate, indicating that stock discrimination improved as the difference in stock-specific growth rate increased. Reevaluation of published studies on other species indicated that growth rate contributes more variation to regional differences in otolith shape than does stock origin. Differences in otolith shape among ages, sexes, and year-classes were also attributable to growth rate differences. To the extent that growth rates vary more between than within stocks, otolith shape analysis can provide an easily determined measure of stock identity.

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