Special Issue: Age and Growth of Chondrichthyan Fishes: New by John K. Carlson, Kenneth J. Goldman
By John K. Carlson, Kenneth J. Goldman
Shark conservation and administration is usually hindered by way of an absence of easy organic info for many species. An realizing of the age constitution and development dynamics of a inhabitants is necessary for potent conservation and administration simply because this data is frequently applied for decision of ordinary mortality and toughness. finally age and development details is used for calculation of important premiums in inhabitants types. over the past few years there were advances within the quantitative research of age and progress of chondrichthyan fishes. Novel techniques to growing old of varied chondrichthyan fishes proceed to come up.
This quantity is a set of papers on a number of of those issues that come with new tough components (e.g. caudal thorns) for exams of age, new suggestions for validation (e.g. bomb radiocarbon) and reexaminations of past age and development types. This quantity additionally includes papers at the significance of assessing the precision and accuracy of statistical formulation, analyses, and types which are utilized in age and progress experiences. there's at present loads of examine being carried out, a few of that's actually "pushing the envelope," in makes an attempt to evaluate the lifestyles heritage parameters of various chondrichthyan fishes.
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Additional info for Special Issue: Age and Growth of Chondrichthyan Fishes: New Methods, Techniques and Analysis (Developments in Environmental Biology of Fishes)
This was based on their estimation that this species forms two pairs of growth bands annually in the vertebral centra. These authors also stated a caveat about their uncertainty of that estimation. 2 for sexes combined. The difference in these life-history parameter estimations, and their ramiﬁcations for management and conservation of this species (Musick et al. 1993, 2000), was the major reason for our re-examination of sand tiger age and growth. Herein, we report our ﬁndings, comment on the importance of ageing protocols and use of multiple back-calculation techniques for chondrichthyan ﬁshes, and brieﬂy discuss the reproductive periodicity of this species.
Percent agreement (PA = [no. agreed/no. , this issue). We used chi-square tests of symmetry to determine whether difference within and between readers were systematic (biased) or due to random error (Hoenig et al. 1995; Evans and Hoenig 1998; Campana 2001). A relative marginal increment (RMI) analysis was used to verify the temporal periodicity of ring formation in the vertebrae. This is a standardized marginal increment analysis whereby the margin, or growth area of a centrum from the last narrow growth ring to the centrum edge, is divided by the width of the last fully formed growth increment (Branstetter and Musick 1994; Conrath et al.
1 years of age for males and females, respectively, using tooth replacement methodology and hypothesized the true value for the wild population to lie somewhere between the estimates from both methods used in his study. 10 year–1 for males and females, respectively. Although all models ﬁt the data well; statistically, the three-parameter von Bertalanffy model described the male size-at-age data better than the other three models. This model overestimated observed maximum size, but observed maximum size fell within the conﬁdence intervals for this model.