Growth patterns and age validation from otolith ring deposition in New Zealand longfin eels Anguilla dieffenbachii recaptured after 10 years at large

2015 ◽  
Vol 86 (3) ◽  
pp. 924-939 ◽  
Author(s):  
M. P. Beentjes ◽  
D. J. Jellyman
Keyword(s):  
New Zealand ◽  
Growth Patterns ◽  
Age Validation ◽  
Anguilla Dieffenbachii

Linking Land Use Capability classes and APSIM to estimate pasture growth for regional land use planning

Soil Research ◽  
2016 ◽  
Vol 54 (1) ◽  
pp. 94 ◽  
Author(s):  
Iris Vogeler ◽  
Rogerio Cichota ◽  
Josef Beautrais
Keyword(s):  
Land Use ◽  
New Zealand ◽  
Land Use Planning ◽  
Management Practices ◽  
Growth Patterns ◽  
Land Resource ◽  
Pastoral Systems ◽  
System Models ◽  
Farm System ◽  
The Impact

Investigation of land-use and management changes at regional scales require the linkage of farm-system models with land-resource information, which for pastoral systems includes forage supply. The New Zealand Land Resource Inventory (NZLRI) and associated Land Use Capability (LUC) database include estimates of the potential stock-carrying capacity across the country, which can be used to derive estimates of average annual pasture yields. Farm system models and decision support tools, however, require information on the seasonal patterns of pasture growth. To generate such pasture growth curves (PGCs), the Agricultural Production Systems Simulator (APSIM) was used, with generic soil profiles based on descriptions of LUC classes, to generate PGCs for three regions of New Zealand. Simulated annual pasture yields were similar to the estimates of annual potential pasture yield in the NZLRI spatial database, and they provided information on inter-annual variability. Simulated PGCs generally agreed well with measured long-term patterns of seasonal pasture growth. The approach can be used to obtain spatially discrete estimates of seasonal pasture growth patterns across New Zealand for use in farm system models and for assessing the impact of management practices and climate change on the regional sustainability.

Age validation and seasonal growth patterns of a subtropical marsh fish: The Gulf Killifish, Fundulus grandis

2017 ◽  
Vol 100 (10) ◽  
pp. 1315-1327 ◽  
Author(s):  
Anthony R. Vastano ◽  
Kenneth W. Able ◽  
Olaf P. Jensen ◽  
Paola C. López-Duarte ◽  
Charles W. Martin ◽  
...  
Keyword(s):  
Growth Patterns ◽  
Seasonal Growth ◽  
Age Validation ◽  
Fundulus Grandis

Studies on the Ecology of the New Zealand Long-finned Eel, Anguilla dieffenbachii Gray

1952 ◽  
Vol 3 (1) ◽  
pp. 32 ◽  
Author(s):  
AMR Burnet
Keyword(s):  
New Zealand ◽  
Population Density ◽  
Mathematical Analysis ◽  
Feeding Habits ◽  
Stomach Contents ◽  
Limiting Factor ◽  
Population Densities ◽  
Baited Traps ◽  
Anguilla Dieffenbachii

Experimental trapping of eels, using carrion-baited traps, was carried out on a number of rivers of various types throughout New Zealand. Where possible, a mathematical analysis has been applied to the trapping results and an estimate of the efficiency obtained. Total trappable population densities of between 30 and 1,368 lb./ac. Were found. An attempt has been made to correlate type of river with the population density. The amount of cover present is apparently the limiting factor. The baited trap takes very few eels of less than 24 in. long and is thus not a very efficient means of keeping a stream free from eels. The feeding habits of the eel are generalized and readily adaptable to most faunas. In most rivers trout occurred only infrequently in the stomach contents.

Another New Zealand centenarian: age validation of black cardinalfish (Epigonus telescopus) using lead–radium and bomb radiocarbon dating

2017 ◽  
Vol 68 (2) ◽  
pp. 352 ◽  
Author(s):  
Dianne M. Tracey ◽  
Allen H. Andrews ◽  
Peter L. Horn ◽  
Helen L. Neil
Keyword(s):  
New Zealand ◽  
Growth Zone ◽  
Commercial Fishing ◽  
Age Validation ◽  
Fishing Activity ◽  
Combined Application ◽  
Bomb Radiocarbon ◽  
Otolith Core ◽  
Radiometric Ages ◽  
Lead 210

Black cardinalfish (Epigonus telescopus, Apogonidae) is an important component of deepsea commercial fishing activity in the New Zealand region. It is estimated to live longer than 100 years on the basis of counts of unvalidated annual growth zones in otoliths. Age-validation procedures for long-lived fishes are often one of the following two techniques: (1) lead–radium disequilibria, which uses the natural decay of radium-226 into lead-210 as a natural clock; or (2) bomb radiocarbon (Δ14C) dating, which relies on the marine signal created by nuclear testing. The high estimated lifespan, as well as the large size of the otolith core region, make E. telescopus an excellent candidate for a combined application of these two independent age-validation techniques. The lead–radium dating using otolith cores indicated that growth-zone counts less than ~60 years were consistent with radiometric ages, whereas higher counts appeared to be under-estimates. There was 95% confidence that maximum age was at least 95 years. The validation indicated that fish aged over 60 years tended to be under-aged by up to 30%. The bomb radiocarbon levels in otolith cores supported age estimates up to ~40 years made from zone counts, and by inference from the zone counts validated with lead–radium dating, longevity exceeds 100 years.

Genetic structure of New Zealand eels Anguilla dieffenbachii and A. australis with allozyme markers

2001 ◽  
Vol 10 (3) ◽  
pp. 132-137 ◽  
Author(s):  
P. J. Smith ◽  
P. G. Benson ◽  
C. Stanger ◽  
B. L. Chisnall ◽  
D. J. Jellyman
Keyword(s):  
New Zealand ◽  
Genetic Structure ◽  
Anguilla Dieffenbachii

Changing population structure of eels (Anguilla dieffenbachii and A. australis) from southern New Zealand

2006 ◽  
Vol 15 (4) ◽  
pp. 428-440 ◽  
Author(s):  
M. P. Beentjes ◽  
D. J. Jellyman ◽  
S. W. Kim
Keyword(s):  
Population Structure ◽  
New Zealand ◽  
Anguilla Dieffenbachii

Using tree-ring crossdating techniques to validate annual growth increments in long-lived fishes

2005 ◽  
Vol 62 (10) ◽  
pp. 2277-2284 ◽  
Author(s):  
Bryan A Black ◽  
George W Boehlert ◽  
Mary M Yoklavich
Keyword(s):  
Time Series ◽  
Tree Ring ◽  
Growth Increment ◽  
Growth Patterns ◽  
Freshwater Species ◽  
Age Validation ◽  
Average Growth ◽  
Growth Increments ◽  
Wide Range ◽  
Ring Analysis

We applied crossdating, a dendrochronology (tree-ring analysis) age validation technique, to growth increment widths of 50 Sebastes diploproa otoliths ranging from 30 to 84 years in age. Synchronous growth patterns were matched by the following: (i) checking the dates of conspicuously narrow growth increments for agreement among samples and (ii) statistically verifying that growth patterns correlated among samples. To statistically verify pattern matching, we fit each time series of otolith measurements with a spline, and all measurements were divided by the values predicted by the curve. This standardized each time series to a mean of 1, removing the effects of age on growth and homogenizing variance. Each time series was then correlated with the average growth patterns of all other series, yielding an average correlation coefficient (r) of 0.53. Average growth of all 50 samples was significantly correlated with an upwelling index (r = 0.40, p = 0.002), the Pacific Decadal Oscillation (r = –0.29, p = 0.007), and the Northern Oscillation Index (r = 0.51, p = 0.0001), corroborating accuracy. We believe this approach to age validation will be applicable to a wide range of long-lived marine and freshwater species.

The influence of environmental cues on the activity of silver eels (Anguilla dieffenbachii) in Lake Manapouri, New Zealand

2018 ◽  
Vol 53 (2) ◽  
pp. 169-181
Author(s):  
Rose E. Stuart ◽  
Gerard P. Closs ◽  
P. Mark Lokman ◽  
Don Jellyman
Keyword(s):  
New Zealand ◽  
Environmental Cues ◽  
Silver Eels ◽  
Anguilla Dieffenbachii

scholarly journals Comparison of Non-linear Growth Curve Models in Non-descript California and New Zealand Rabbits Reared in the Tropical Conditions of Nigeria

2020 ◽  
pp. 22-28
Author(s):  
Okeke Rufina Obioma ◽  
Suleiman Ibrahim Onotu ◽  
Omotugba Stephen Kayode ◽  
Ibikunle Kehinde Yemiola ◽  
Idris Abdullahi ◽  
...  
Keyword(s):  
New Zealand ◽  
Growth Curve ◽  
Logistic Models ◽  
Growth Patterns ◽  
Data Matrix ◽  
Nonlinear Functions ◽  
Average Growth ◽  
Growth Curve Models ◽  
Tropical Conditions ◽  
Weight Data

Nonlinear functions of body weight at different age intervals were used to estimate the growth pattern in New Zealand White and California rabbits. Gompertz and Logistic functions of 3 and 4 parameters were fitted to Age-weight data matrix. Age-weight records of New Zealand White and California rabbits from birth were monitored to 56 days to estimate the average growth curve for each breed. The weight difference between breeds was consistently in favor of California rabbits as compared to New Zealand White. It was concluded that the Gompertz and logistic models were both parsimonious and adequate in describing the growth patterns of New Zealand White and California rabbits in the tropical conditions of Nigeria.

scholarly journals Age validation and growth of southern blue whiting,Micromesistius australisNorman, in New Zealand

1996 ◽  
Vol 30 (1) ◽  
pp. 57-67 ◽  
Author(s):  
S. M. Hanchet ◽  
Y. Uozumi
Keyword(s):  
New Zealand ◽  
Age Validation ◽  
Blue Whiting
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