scholarly journals Sagittal otolith size and shape variability to identify geographical intraspecific differences in two species of sparidae (Pagellus erythrinus and Diplodus vulgaris)

2018 ◽  
Vol 5 ◽  
Author(s):  
Marwa Mejri ◽  
Imen Jmil ◽  
Jean-Pierre QUIGNARD ◽  
Monia Trabelsi
Keyword(s):  
Size And Shape ◽  
Pagellus Erythrinus ◽  
Sagittal Otolith ◽  
Otolith Size

scholarly journals Sagittal otolith size and shape variability to identify geographical intraspecific differences in three species of the genus Merluccius

2000 ◽  
Vol 80 (2) ◽  
pp. 333-342 ◽  
Author(s):  
Gabriel J. Torres ◽  
Antoni Lombarte ◽  
Beatriz Morales-Nin
Keyword(s):  
Intraspecific Variability ◽  
Geographical Differentiation ◽  
Morphometric Measurements ◽  
Fourier Harmonic ◽  
Size And Shape ◽  
Sagittal Otolith ◽  
Spatial Differences ◽  
Discriminant Analyses ◽  
Components Analysis ◽  
Otolith Size

A study was carried out on the morphology (size and shape) of the saccular otolith (sagitta) by means of image analysis on three species of the genus Merluccius (M. gayi, M. hubbsi and M. merluccius). By digitization of the sagittae, morphometry and outline (Fourier harmonic) as form descriptor measurements were obtained, that were subsequently analysed by means of multivariant methods, allowing the intraspecific variability to be quantified. The differences in the intraspecific sagittal otolith variability confirmed spatial differences of predicted groups. The results were associated with environmental and population aspects. The use of combined morphometric measurements for the whole otolith and its corresponding sulcus acusticus were very appropriate for determining the origin of the analysed otoliths. Using both principal components analysis and discriminant analyses, a clear geographical differentiation was obtained for Merluccius gayi (from Chile and Peru) and M. merluccius (from the Atlantic and Mediterranean). In both species, the discriminant analysis predicted that all the sagittae could be correctly assigned within each of the groups studied. However, it was a little less effective at differentiating between the two groups of M. hubbsi (from the San Matias Gulf on the Patagonian Shelf and Argentinian–Uruguayan Common Fishing Zone). As a result, the morphometric analysis of the sagittae otoliths acted as a clear diagnostic tool to differentiate individuals from different geographical distribution areas.

Relationships between sagittal otolith size and body size of Terapon jarbua (Teleostei, Terapontidae) in Malaysian waters

2020 ◽  
Author(s):  
Shyama Sundari Devi Chanthran ◽  
Phaik Eem Lim ◽  
Sze-Wan Poong ◽  
Jianguo Du ◽  
Kar-Hoe Loh
Keyword(s):  
Body Size ◽  
Sagittal Otolith ◽  
Otolith Size

scholarly journals The Size and The Shape of Sagittal Otolith of Redtail Scad, Decapterus kurroides Blekeer 1855 from Kema Bay, North Minahasa Regency, North Sulawesi, Indonesia

Omni-Akuatika ◽  
2020 ◽  
Vol 16 (3) ◽  
pp. 99
Author(s):  
Fransine B Manginsela ◽  
Gybert E Mamuaya ◽  
Rizald M Rompas ◽  
Lawrence J L Lumingas
Keyword(s):  
Shape Index ◽  
Growth Patterns ◽  
Width Ratio ◽  
Total Length ◽  
North Sulawesi ◽  
Sagittal Otolith ◽  
Significant Difference ◽  
Length Width ◽  
The Difference ◽  
Otolith Size

This study aimed to examine the difference in the otolith size and otolith shape of redtail scad Decapterus kurrodes between sex in North Sulawesi. The otoliths of D. kurroides were studied for sagitta otolith pair samples of 34 juveniles,   58 females and 75 males from Kema Bay. These pairs sagitta otolith images were interpreted using ImageJ tool to describe the otolith size (length, width, perimeter, and area), then we calculated the shape index (form factor, roundness, circularity, rectangularity, ellipticity and aspect ratio or length-width ratio). No significant difference was found in otolith length between left and right otoliths of juveniles of D. kurroides or called symmetrical but significant differences or asymmetrical were found in all sample, females and males. The regressions of total length against otolith sizes (otolith lengt, otolith width otolith perimeter and otolith area of D. kurroides follow a power function. The growth patterns showed dominant allometric growth in total length–otolith sizes relationships of D. kurroides from Kema Bay, Key Words: size, shape index, otolith, Decapterus kurroides, Kema Bay.

scholarly journals Biometric relationships between body size and otolith size in 15 demersal marine fish species from the northern Brazilian coast

2019 ◽  
Vol 49 (4) ◽  
pp. 299-306
Author(s):  
Rory Romero de Sena OLIVEIRA ◽  
Marcelo Costa ANDRADE ◽  
Fabiola Seabra MACHADO ◽  
Élida Jesana Santana CUNHA ◽  
Flaviane Souto de FREITAS ◽  
...  
Keyword(s):  
Stomach Contents ◽  
Coefficient Of Determination ◽  
Brazilian Coast ◽  
Marine Fish Species ◽  
Fish Size ◽  
Total Length ◽  
Marine Predators ◽  
Sagittal Otolith ◽  
First Time ◽  
Otolith Size

ABSTRACT The relationships between fish size and sagitta otolith measurements were calculated for the first time for 15 species belonging to six families from the northern Brazilian coast. A total of 220 fish were sampled from the bycatch landed by the bottom-trawl industrial shrimp-fishing fleet between August and September 2016. All species had strong relationships between otolith measurements and fish total length with the coefficient of determination (r 2) ranging between 0.71 and 0.99. The variable most strongly related to fish total length was found to be the sagittal otolith length (OL) with 98% of the variability. These relationships are a useful tool to estimate length and mass of preyed fish from otoliths found in stomach contents of marine predators.

Unbiased estimation of particle number and sizes using the new stereological tools: the disector, the fractionator, the selector, and the nucleator — or just point-sampled intercepts

1988 ◽  
Vol 46 ◽  
pp. 428-429
Author(s):  
H.J.G. Gundersen
Keyword(s):  
Particle Number ◽  
Small Distance ◽  
Parallel Plane ◽  
Unbiased Estimation ◽  
Severe Problem ◽  
New Era ◽  
Size And Shape ◽  
Distinct Property ◽  
Sectioned Tissue

Previously, all stereological estimation of particle number and sizes were based on models and notoriously gave biased results, were very inefficient to use and difficult to justify. For all references to old methods and a direct comparison with unbiased methods see recent reviews.The publication in 1984 of the DISECTOR, the first unbiased stereological probe for sampling and counting 3—D objects irrespective of their size and shape, signalled the new era in stereology — and give rise to a number of remarkably simple and efficient techniques based on its distinct property: It is the only known way to obtain an unbiased sample of 3-D objects (cells, organelles, etc). The principle is simple: within a 2-D unbiased frame count or sample only cells which are not hit by a parallel plane at a known, small distance h.The area of the frame and h must be known, which might sometimes in itself be a problem, albeit usually a small one. A more severe problem may arise because these constants are known at the scale of the fixed, embedded and sectioned tissue which is often shrunken considerably.

The influence of confocal microscope design on imaging performance

1993 ◽  
Vol 51 ◽  
pp. 144-145
Author(s):  
C J R Sheppard
Keyword(s):  
Image Quality ◽  
Fluorescence Imaging ◽  
Confocal Microscope ◽  
Industrial Applications ◽  
Three Dimensions ◽  
Design Parameters ◽  
Weak Signals ◽  
Size And Shape ◽  
Imaging Performance ◽  
Fundamental Limitation

The confocal microscope is now widely used in both biomedical and industrial applications for imaging, in three dimensions, objects with appreciable depth. There are now a range of different microscopes on the market, which have adopted a variety of different designs. The aim of this paper is to explore the effects on imaging performance of design parameters including the method of scanning, the type of detector, and the size and shape of the confocal aperture.It is becoming apparent that there is no such thing as an ideal confocal microscope: all systems have limitations and the best compromise depends on what the microscope is used for and how it is used. The most important compromise at present is between image quality and speed of scanning, which is particularly apparent when imaging with very weak signals. If great speed is not of importance, then the fundamental limitation for fluorescence imaging is the detection of sufficient numbers of photons before the fluorochrome bleaches.

SIZE AND SHAPE OF CRYSTAL FACES ON HEATED METAL TIPS

1984 ◽  
Vol 45 (C9) ◽  
pp. C9-29-C9-37
Author(s):  
Vu Thien Binh ◽  
M. Drechsler
Keyword(s):  
Size And Shape ◽  
Heated Metal
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