After collection total length (mm) was measured for each fish and lapilli otoliths
Fish age could be better estimated by otolith
weight than other otolith
measurements such as otolith
length, width and thickness, and even fish length (Boehlert, 1985; Newman, 2002; Francis & Campana, 2004).
Species Conversion Equation n [R.sup.2] Alewife SL to FL FL=1.0076(SL)+18.832 1056 0.920 Alewife SL to TL FL=1.0922(SL)+31.529 1002 0.873 Alewife FL to TL FL=0.9852(FL)+33.807 1001 0.968 Blueback SL to FL FL=1.0208(SL)+14.675 630 0.928 Blueback SL to TL TL=1.1446(SL)+18.644 630 0.930 Blueback FL to TL TL=1.104(FL)+6.02 630 0.972 Table 2 The number of samples for each comparison of ages between otolith
and scale readings for alewife (Alosa pseudoharengus) captured between 2007 and 2015 in the Potomac River in northern Virginia, with t-test statistics (t) to indicate bias for each age.
The basic question in this preliminary study is, can we use water chemistry and otolith
chemistry to distinguish resident trout from those whose mothers reside most of the year in the Willamette River and then migrate into the Marys River?
As landmarks were insufficient to represent the body and otolith
shapes, we generated templates of the digital images to provide guidelines of equal angular spacing to identify points (semilandmarks) along the structure's curves using the MakeFan program (Sheets, 2004).
The keys to Llopiz's research are tiny calcium carbonate stones, called otoliths
, that grow from birth in fishes' heads.
2009: Comparison of age estimates from scale, opercular bone, otolith
, vertebrae and dorsal fin ray in Labeo rohita (Hamilton), Catla catla (Hamilton) and Channa marulius (Hamilton).
are used in various studies such as age determination, fish growth and population dynamics all over the world (Bostanci et al.); however, the otolith
morphology and shape indices for D.
A comparison of a validated otolith
method to age weakfish, Cynoscion regalis, with the traditional scale method.
Differences in collective otoconial mass between the paired otolith
organs could in principle result in asymmetric shear forces on the otolith
membranes, although a compensation for asymmetries in vestibular function typically occurs .
Further regression analyses examined the relationship between body length and age (days) to determine whether otolith
measurements provide accurate proxies of somatic traits (Booth and Parkinson 2011).