Age at first increment formation and validation of daily growth increments in golden perch(Macquaria ambigua:Percichthyidae) otoliths

2007 ◽  
Vol 41 (2) ◽  
pp. 157-161 ◽  
Author(s):  
Paul Brown ◽  
Ian Wooden
Keyword(s):  
Daily Growth ◽  
Growth Increments ◽  
Increment Formation

scholarly journals Age determination in merobenthic octopuses using stylet increment analysis: assessing future challenges using Macroctopus maorum as a model

2011 ◽  
Vol 68 (10) ◽  
pp. 2059-2063 ◽  
Author(s):  
Zoë A. Doubleday ◽  
Jimmy White ◽  
Gretta T. Pecl ◽  
Jayson M. Semmens
Keyword(s):  
Body Weight ◽  
Life History ◽  
Early Life ◽  
Age Determination ◽  
Early Life History ◽  
Daily Growth ◽  
Life History Stages ◽  
Growth Increments ◽  
Increment Formation ◽  
Future Challenges

Abstract Doubleday, Z. A., White, J., Pecl, G. T., and Semmens, J. M. 2011. Age determination in merobenthic octopuses using stylet increment analysis: assessing future challenges using Macroctopus maorum as a model. – ICES Journal of Marine Science, 68: 2059–2063. Stylet increment analysis (SIA) is a method recently developed to age octopuses; it involves the enumeration of daily growth increments within stylets (an internal shell). To examine the potential of SIA in a merobenthic octopus species, SIA was applied to Macroctopus maorum collected from southeast Australia and New Zealand (n = 147). The stylets had clear concentric growth increments and a core-like region. However, low increment counts (≤224 d) produced non-feasibly high (≤21.7% body weight per day) instantaneous growth rates, based on the assumption that increment number relates to age (d). In the light of these results, the issues surrounding the application of SIA to merobenthic octopuses is discussed, particularly in relation to the lack of understanding in regard to stylet development in the early life history stages and the importance of validating age at first increment formation.

Spatial Variability of Recent Otolith Growth and RNA Indices in Pelagic Juvenile Diaphus kapalae (Myctophidae): an Effect of Flow Disturbance near an Island?

1996 ◽  
Vol 47 (2) ◽  
pp. 273 ◽  
Author(s):  
IM Suthers
Keyword(s):  
Dry Weight ◽  
Otolith Growth ◽  
Flow Disturbance ◽  
Daily Growth ◽  
Growth Increments ◽  
Recent Growth ◽  
Significant Difference ◽  
Increment Formation ◽  
Marginal Increment ◽  
Pelagic Juvenile

In February 1993, the pelagic juvenile myctophid Diaphus kapalae was sampled with a neuston net in the southern Coral Sea in a region of flow disturbance north of Cato Reef, and to the east in the free stream (northerly flow at 30 cm s-1). There was no significant difference in the size (11-16 mm SL) or age (45-74 days after hatching) between the two regions. Recent growth indices derived from the width of the peripheral daily growth increments (~10 μm each) revealed enhanced otolith growth 38 km downstream and up to 4 days before capture. No significant difference was found for times longer than a week before capture, consistent with fluctuation of the wake indicated from current-meter data. Daily increment formation was confirmed by marginal increment analysis. Recent otolith growth was correlated with the RNA content adjusted by dry weight, which also revealed significantly higher condition in the wake region. Recent growth was correlated with microzooplankton biomass, recorded with an optical plankton counter.

Otolith Microstructore of Larval Herring (Clupea harengus): Image or Reality?

1987 ◽  
Vol 44 (11) ◽  
pp. 1922-1929 ◽  
Author(s):  
Steven E. Campana ◽  
Jacques A. Gagné ◽  
Jean Munro
Keyword(s):  
Systematic Difference ◽  
Clupea Harengus ◽  
Sensitive Species ◽  
Daily Growth ◽  
Growth Increments ◽  
Pelagic Larvae ◽  
Rate Of Increase ◽  
Increment Formation ◽  
Slow Growing ◽  
Mortality Estimates

When assessed with light microscopy, daily increment formation did not appear to occur in the otoliths of known-age larval herring (Clupea harengus). Increment counts underestimated age in all larvae. The age-increment discrepancy increased curvilinearly with age and appeared to stabilize after 50–60 d. Both the magnitude and rate of increase of the discrepancy were consistent with a hypothesis of resolution-limited increment visibility; models of daily otolith growth indicated that discrete daily growth increments would not be resolvable with a light microscope for the first 15–20 d after hatch. The hypothesis was also consistent with the observed effects of otolith polishing, a systematic difference in increment counts between different-sized sagittae in the same larvae, and other published reports of apparent nondaily increment formation in slow-growing pelagic larvae. Previous reports of growth rate limited increment formation appear to provide an empirical description of the same phenomenon. Otolith-based age, growth and mortality estimates can be expected to be biased if resolution effects are ignored. However, various procedures are available for the identification of potentially sensitive species and samples.

Analyses of field moult data: prediction of intermoult period and assessment of seasonal growth in Antarctic krill, Euphausia superba Dana

1989 ◽  
Vol 1 (4) ◽  
pp. 301-306 ◽  
Author(s):  
Friedrich Buchholz ◽  
David J. Morris ◽  
Jonathan L. Watkins
Keyword(s):  
Food Availability ◽  
Antarctic Krill ◽  
Marked Effect ◽  
Laboratory Data ◽  
Euphausia Superba ◽  
Simple Relationship ◽  
Daily Growth ◽  
Growth Increments ◽  
Data Prediction ◽  
Field Samples

A technique for moult staging Antarctic krill (Euphausia superba Dana) was used in the analysis of field samples to predict intermoult periods and hence assess growth and the effects of seasonal changes in food availability. The proportion of moulting krill was used, in conjunction with laboratory data on the duration of this phase, to predict the moulting frequency (intermoult period, IMP). The moulting frequency was then combined with appropriate daily growth increments from laboratory study to assess overall growth in the krill sampled. The effects of seasonal fluctuations in food availability on moulting frequency were examined for samples taken at five different locations and times of year. Moulting rate was not linearly related to the availability of phytoplankton, although it is likely that this factor has a marked effect. Similarly, although temperature affects IMP, the data indicate that this is not a simple relationship either. These preliminary data indicate the value of utilizing this technique in the analysis of field samples of Antarctic krill.

Influence of biomass and ocean climate on the growth of Pacific herring (Clupea pallasi) from the southwest coast of Vancouver Island

1997 ◽  
Vol 54 (12) ◽  
pp. 2782-2788 ◽  
Author(s):  
R W Tanasichuk
Keyword(s):  
Growth Rates ◽  
Growing Season ◽  
Vancouver Island ◽  
Pacific Herring ◽  
Daily Growth ◽  
Sea Temperature ◽  
Clupea Pallasi ◽  
Southwest Coast ◽  
Growth Increments ◽  
Adult Growth

I examined the growth of Pacific herring (Clupea pallasi) from the southwest coast of Vancouver Island using data for over 83 000 fish seined between 1975 and 1996. Size-at-age (length, total mass) of recruits (age 3) was negatively related to parental biomass. Length was also negatively related to sea temperature over the first growing season and positively related to salinity later in the third growing season. Prerecruit effects explained variations in mass and length for adult herring ages 4 and 5, respectively. Growth of adults was described as growth increments (growth rates). Seasonal growth in length for adults was assumed to be a linear function of time, and growth in mass an exponential function. Daily growth rates for length were negatively related to initial length. Instantaneous daily growth rates in mass were a negative function of initial mass, adult biomass, and sea temperature in August. Interannual variations in condition suggest that adults grow differently in mass than they do in length. I suggest that length is not synonymous with mass as a measure of adult growth. Consequently, it provides little, if any, information on surplus energy accumulation by adults and therefore adult fish contribution to stock productivity.

Daily Growth Increments in Otoliths of Starry Flounder (Platichthys stellatus) and the Influence of Some Environmental Variables in Their Production

1982 ◽  
Vol 39 (7) ◽  
pp. 937-942 ◽  
Author(s):  
Steven E. Campana ◽  
John D. Neilson
Keyword(s):  
Environmental Conditions ◽  
Environmental Variables ◽  
Daily Basis ◽  
Otolith Growth ◽  
Daily Growth ◽  
Environmental Regime ◽  
Starry Flounder ◽  
Daily Increments ◽  
Growth Increments ◽  
Platichthys Stellatus

Tetracycline injected into juvenile starry flounders (Platichthys stellatus) was incorporated into the periphery of the sagittal otoliths within 24 h. The resulting band, visible under ultraviolet light, was used as a dated mark on the otolith growth increments. This technique was used to verify that increments were laid down on a daily basis, both in field and laboratory environments. Subdaily increments were visible in otoliths of fishes reared under most environmental conditions. The production of daily increments in juvenile starry flounders preconditioned to a natural environmental regime was unaffected by photoperiod or temperature fluctuation, suggesting the presence of an internal circadian rhythm.Key words: starry flounder, Platichthys stellatus; otoliths, daily rings, growth increments, circadian, tetracycline

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