Age and Growth of Capoeta Erhani (Actinopterygii: Cypriniformes: Cyprinidae) From the Menzelet Reservoir, Turkey (original) (raw)
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Cybium, 2007
A B S T R A C T. -Age and growth of S c a rdinius ery t h ro p h t h a l m u s (Linnaeus, 1758) collected from Bafra Fish Lakes between January 2000 and December 2000 were determined by examination of five hard structures. Scales, vertebrae, opercular bones, lagenar and utricular otoliths were aged by three readers independently. The precision in age estimations, which is derived by percent reader agreement and coefficient of variation indicated that otoliths were the most reliable structures for age determination. The estimated ages ranged from two to five years. The radius length of each annulus was measured in lagenar and utricular otoliths and the mean values per age were calculated. Otolith dimensions were found to be highly correlative with the fork length. The weight-length relationship of S. ery t h ro p h t h a l m u s was described as W = 0 . 0 1 0 5 F L 3 . 2 3 ( r = 0.98) for combined sexes. Monthly changes in the frequency of appearance of an opaque margin on the outer edge of the otolith and the annual variation of marginal increment length indicated that only one growth zone formed from March to October per year. R É S U M É. -Détermination de l'âge des S c a rdinius ery t h ro p h t h a l m u s (Cyprinidae) vivant dans les lacs de Bafra (Samsun,Turquie) par lecture de stries annuelles sur les otolithes et validation par les incréments marginaux. L'âge et la croissance de S c a rdinius ery t h ro p h t h a l m u s (Linné, 1758) dans les lacs de Bafra (Turquie) entre janvier et décembre 2000 ont été déterminés par l'examen de cinq types de structures dures. Les écailles, les vertèbres, les opercules, l'otolithe lagenaire (sagitta) et l'otolithe utriculaire (lapillus) ont été observés par trois personnes de façon indépendante.
Cybium, 2007
A B S T R A C T. -Age and growth of S c a rdinius ery t h ro p h t h a l m u s (Linnaeus, 1758) collected from Bafra Fish Lakes between January 2000 and December 2000 were determined by examination of five hard structures. Scales, vertebrae, opercular bones, lagenar and utricular otoliths were aged by three readers independently. The precision in age estimations, which is derived by percent reader agreement and coefficient of variation indicated that otoliths were the most reliable structures for age determination. The estimated ages ranged from two to five years. The radius length of each annulus was measured in lagenar and utricular otoliths and the mean values per age were calculated. Otolith dimensions were found to be highly correlative with the fork length. The weight-length relationship of S. ery t h ro p h t h a l m u s was described as W = 0 . 0 1 0 5 F L 3 . 2 3 ( r = 0.98) for combined sexes. Monthly changes in the frequency of appearance of an opaque margin on the outer edge of the otolith and the annual variation of marginal increment length indicated that only one growth zone formed from March to October per year. R É S U M É. -Détermination de l'âge des S c a rdinius ery t h ro p h t h a l m u s (Cyprinidae) vivant dans les lacs de Bafra (Samsun,Turquie) par lecture de stries annuelles sur les otolithes et validation par les incréments marginaux. L'âge et la croissance de S c a rdinius ery t h ro p h t h a l m u s (Linné, 1758) dans les lacs de Bafra (Turquie) entre janvier et décembre 2000 ont été déterminés par l'examen de cinq types de structures dures. Les écailles, les vertèbres, les opercules, l'otolithe lagenaire (sagitta) et l'otolithe utriculaire (lapillus) ont été observés par trois personnes de façon indépendante.
Age, growth rates and otolith morphometry of Capoeta angorae, collected by using electro shocker, were determined from the Fırnız Stream and Menzelet Reservoir between August 2011 and November 2012. A total of 175 otoliths were obtained from C. angorae that ranged between 7.5 and 27.0 cm L were used in the analysis. The overall male : female ratio (M : F = 1.52 : 1.00) was biased in favour of males. Student’s t-test revealed significant differences between sexes, regarding total length (P < 0.05). The length–weight relationships were calculated as W = 0.0128L2.8703 (R2= 0.975) for females, W = 0.0103L2.9462 (R2 = 0.969) for males and W = 0.0097L2.9629 (R2 = 0.978) for all specimens. Otolith length (OL), width (OW) and radius (OR) were ranged between 1.67 – 3.45 mm, 1.39 – 2.82 mm and 0.89 – 1.70 mm, respectively. The von Bertalanffy growth models were L∞ = 27.55 cm (L), K = 0.465 (year-1), t0 = -0.539 (year), females; L∞ = 22.84 cm (L), K = 0.772 (year-1), t0 = -0.71 (year) males...
Iranian Journal of Fisheries Sciences, 2013
The relationships between sagitta otolith morphology and fish size were examined for common carp in the Southern Caspian Sea; and also the aging of different length groups were determined. Statistical tests to examine correlation between left and right otoliths dimensions were carried out and no statistically significant difference between them was found. The biggest otolith had 0.032g weight belongs to an individual with BW= 428g and FL=36cm; and the smallest otolith had 0.014g for a fish with BW=220g and FL= 26cm. Regression model relations to each otolith morphometric parameter to fish length are provided. Also, the aging of this species was done by sectioning of sagitta otolith and a high significant correlations was found between fish age and morphometric parameters of both body weight and fork length and also otolith weight and length. The maximum age was determined 6 + years. The length-weight relationship was BW= 0.006 TL 3.232 (r = 0.963). According to the morphometric rela...
North American Journal of Fisheries Management, 2008
Age data are commonly used by fisheries biologists to assess a number of important population characteristics. For cyprinid fishes, there have been few attempts to assess the validity of age estimates, particularly those based on otolith microstructure. We assessed the periodicity of growth increment formation in the otoliths of three species of cyprinid from the Brazos River, Texas, two of which are of conservation concern. We immersed juvenile sharpnose shiners Notropis oxyrhynchus, smalleye shiners N. buccula, and plains minnow Hybognathus placitus in a 100mg/L solution of alizarin complexone for 24 h and sampled fish at 5-d intervals for 30 d. Regression models indicated high correspondence between number of days posttreatment and number of growth increments between the alizarin mark and the edge of the otolith for all three species (sharpnose shiner: r 2 ¼ 0.99; smalleye shiner: r 2 ¼ 0.98; plains minnow: r 2 ¼ 0.97). Slopes of regression lines did not differ from 1.0 (t-test: P , 0.05), indicating that growth increments are deposited daily in these three species. Our results provide evidence that daily growth increments are reliable sources of age information for cyprinids.
The relationships between size (length and width) of the lagenar (asteriscus) and the utricular (lapillus) otoliths and body length for five cyprinid fish species, freshwater bream Abramis brama, white bream Blicca bjoerkna, Prussian carp Carassius gibelio, brond-snout Chondrostoma regium, and rudd Scardinius erythrophthalmus, collected from Lake Ladik from November 2009 through October 2010, are presented. The right and left side measurements of otoliths were pooled in all cases except asteriscus length in Prussian carp. Nonlinear and linear functions provided the best fit for 80% and 20% of all species, respectively. All relationships were highly significant (P < 0.001, R2 > 0.71) and the mean percent prediction errors were less than 10%. The results showed that reliable original size estimates of all species studied are obtainable from their otolith biometrics. The regressions from this study can be useful for investigators examining food habits of piscivorous fauna and sizes of these fishes in archaeological samples.
Marine Biology, 1995
Abstraet Otolith increment age estimates for a deepwater species, AUocyttus verrucosus, were validated by comparison with the results from 21~ radiometric analysis. Transverse sectioning and subsequent grinding of otoliths to a thickness of --0.2 mm revealed increments which provided age estimates for a range of fish sizes. Age estimates ranged from 7 yr for an immature fish of 15.2 cm total length (TL) to 130 yr for a female fish of 36.5 cm TL. Age at maturity was estimated as 28 yr for females and 24 yr for males. In comparison, radiometric analysis of whole otoliths, using a single linear ototith-mass growth-rate model suggested maximum ages of 130 to 170 yr for fish of 34 to 35 cm TL. Radiometric ages were also recalculated using a two-phase otolith-mass growth-rate model in which the growth rate was assumed to slow after maturity to 90% of the pre-maturity rate. This reduced the maximum age to 132 _+ 15 yr for a mean fish length of 34.5 cm. Age at maturity for females was estimated at 34yr. The similarity between age estimates from otolith-increment counts and radiometric analysis strongly supports the accuracy of results from both methods, and encourages further use of such comparisons as an alternative to traditional validation techniques.
Age and growth of four tropical marine fish species: Lethrinus choerorynchus, Lutjanus kasmira, A'emipterus furcosus and Scomberomorus brusiliensis, were determined by means of otolith interpretation and length-frequency analysis. The results showed the presence of annual rings in the studied species. These rings were consistently interpreted and their annwl periodicity tested by means of various methods. The annuli are composed of distinct daily increments, of different thickness depending of the otolith area. Growth determination by means of length-frequency analysis was problematic in some species due to the lack of clear modal classes (in the length distributions). n i e joint analysis of the age and the length-frequency data improved the estimation of growth parameters, and allowed the selection of results that were biologically acceptable. Keynords : Growth, tropical fish, otolith microstructure, length frequency analysis. Détermination de la croissance de poissons marins tropicaux au moyen de fanalyse des fréquences de tailles et de Pinterprétation de lecture à'otolithes. Résumé L'étude de la croissance et de i'âge de quatre espèces de poissons marins tropicaux: Lethrinus choerorjnchus, Lutjanus kasmira, Nemipterus furcosus et Scomberomorus brusiliensis a été faite au moyen de i'analyse des fyéquences de tailles et de lectures d'otolithes. Ces otolithes présentent des anneaux annuels chez les espèces étudiées. Ces anneaux se distinguent clairement et leur périodicité annuelle a été testée ri I'aide de diverses méthodes. Les annuli sont formés du dépôt journalier de microstries d'épaisseur variable selon la zone de i'otolithe considérée. La détermination de la croissance au moyen de i'analyse des fréquences de tailles est rendue délicate chez certaines espkes par le manque de classes modales distinctes. L'analyse conjointe de I'âge et de la fréquence des tailles des captures améliore l'estimation des paramètres de croissance et permet la sélection des résultats ayant une signification biologique. hlots-clés : Croissance, poissons tropicaux, microstructure de I'otholithe, analyse des fréquences de tailles.
Fisheries Research, 2009
We examined sagittal otoliths from 398 gray angelfish (Pomacanthus arcuatus) collected from the lower Florida Keys between September 2000 and September 2003. Fish ranged in size from 78 to 442 mm total length (TL). Males had a mean TL of 329 mm (n = 192), females had a mean TL of 308 mm (n = 166), and an additional 56 fish were unsexed (mean TL = 239 mm). Sectioned otoliths displayed clear increments that were used to estimate fish ages. Marginal increment analysis validated the formation of a single annulus per year. The relationship between TL and age was described by the von Bertalanffy growth equation L t = 325.1[1 − exp(−0.0601(t + 0.828))] for females and L t = 388.5[1 − exp(−0.383(t + 0.923))] for males. Females and males grew rapidly for the first 5 years of life and eventually reached asymptotic lengths of ∼325 and ∼388 mm, respectively, with a maximum estimated age of 24 years. Morphometric parameters evaluated for use in the age model for gray angelfish included fish length and weight and otolith length, width, thickness, and weight. As with fish length, otolith length and width became asymptotic between the ages of 4 and 7. Otolith weight increased throughout the life of the fish, but the rate of increase slowed with age. Only otolith thickness was linear with fish age. Stepwise forward regression resulted in the following equation: ln (age + 1) = 1.157 + 2.542 × ln(otolith thickness) indicating that otolith thickness, which explained 89% of the variation, was the best predictor of age. Additional variables did not improve the regression, nor did dividing the data into subsets based on growth rate. Once the otolith thickness-age relationship was established, the simple process of measuring otolith thickness was as effective for determining the age of gray angelfish as the far more difficult process of sectioning and reading the otoliths. Use of similar models in ageing other species, along with periodic validation to ensure that the otolith parameter-age relationship has not changed over time, could simplify age data collection for population models. This, in turn, could potentially allow fisheries to be better managed at a significantly reduced cost.