Validation of daily growth increments in otoliths of Anguilla rostrata (Lesueur) elvers

1995 ◽  
Vol 73 (1) ◽  
pp. 208-211 ◽  
Author(s):  
Michael H. Martin
Keyword(s):  
Rhode Island ◽  
Tetracycline Hydrochloride ◽  
Anguilla Rostrata ◽  
Daily Growth ◽  
Growth Increments ◽  
Time Required ◽  
Hydrochloride Solution

The presence of daily growth increments in otoliths was validated for Anguilla rostrata. Elvers were captured at the freshwater–seawater interface of the Annaquatucket River, Rhode Island, immersed in a tetracycline hydrochloride solution to mark their otoliths, and maintained in stream aquaria for 10 or 20 d. Increment counts outside the tetracycline mark generally underestimated the number of days since marking by less than 5%. This underestimation was probably due to the time required for tetracycline incorporation after administration.

Validation of Daily Growth increments in Otoliths form Thrysa aestuaria (Ogilby), a tropical Anchovy from Northern Australia

1992 ◽  
Vol 43 (5) ◽  
pp. 1043 ◽  
Author(s):  
FE Hoedt
Keyword(s):  
Growth Parameters ◽  
Age And Growth ◽  
Tetracycline Hydrochloride ◽  
Northern Australia ◽  
Growth Rings ◽  
Daily Growth ◽  
Growth Increments ◽  
Single Cohort

Age and growth parameters were determined for the tropical anchovy Thryssa aestuaria from northern Queensland, Australia. Larval and juvenile forms of T. aestuaria, believed to be a single cohort recruited in the spring of 1990, were sampled between October 1990 and January 1991. Counts of growth rings in sagittal otoliths were determined for specimens from three of these samples. Comparisons of the different ring counts of fish from successive samples with the number of days elapsed between samples suggested that the growth rings examined were deposited daily. Two specimens of T. aestuaria marked with tetracycline hydrochloride in aquaria were found to deposit growth rings in the sagitta at a rate of one ring per day. Problems associated with reading daily growth rings in tropical anchovies are discussed in light of the results of this study. Growth in T. aestuaria is discussed in relation to reported growth information for other species of tropical anchovies.

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.

Estimating the ages of successional stands of tropical trees from growth increments

1997 ◽  
Vol 13 (6) ◽  
pp. 833-856 ◽  
Author(s):  
John Terborgh ◽  
Cesar Flores N. ◽  
Peter Mueller ◽  
Lisa Davenport
Keyword(s):  
Tropical Forests ◽  
Primary Succession ◽  
Tropical Trees ◽  
Applied Science ◽  
Point Bar ◽  
Growth Increments ◽  
Loess Regression ◽  
Successional Species ◽  
Time Required ◽  
Slow Growing

ABSTRACTInability to age tropical trees has imposed major limitations on the basic and applied science of tropical forests. Here advantage was taken of even-aged stands present in successional chronosequences found on Amazonian Whitewater river meanders to simplify the assumptions needed to estimate tree ages from growth measurements. Growth increments of eight common early successional species were measured in 21 0.5-ha plots evenly distributed over chronosequences from the earliest post-pioneer stage to mature Ficus-Cedrela stands representing approximately the mid-point of primary succession. Increment measurements, based on 4 or 5 y of growth, were arrayed in scatter diagrams against the midpoints of the growth intervals. A loess regression of the points, weighted for the higher mortality of slow-growing individuals, was then conducted to generate a ‘best estimate lifetime growth trajectory’ (BELGT) of a ‘typical’ individual surviving to maturity. The BELGT curves were integrated to generate a set of derived curves describing the time required by a ‘typical’ surviving individual to attain any given size up to the maximum for the species. Predictions of the ages of particular stands were derived from these latter curves and found to agree within 3 to 20% of ages independently estimated from the rate of point bar accretion.

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