The growth and age structure of Chilean jack mackerel ( Trachurus murphyi ) following its influx to New Zealand waters

2020 ◽  
Author(s):  
Peter L. Horn ◽  
Caoimhghin Ó Maolagáin
Keyword(s):  
New Zealand ◽  
Age Structure ◽  
Jack Mackerel ◽  
Trachurus Murphyi

scholarly journals Genetic variability in jack mackerel Trachurus murphyi Nichols: New SSRs loci and application

2012 ◽  
Vol 76 (1) ◽  
pp. 67-71 ◽  
Author(s):  
Ricardo Galleguillos ◽  
Cristian B Canales-Aguirre ◽  
Sandra Ferrada
Keyword(s):  
Genetic Variability ◽  
Jack Mackerel ◽  
Trachurus Murphyi

scholarly journals Insight on population structure of the Chilean jack mackerel (Trachurus murphyi)

2012 ◽  
Vol 25 (4) ◽  
pp. 341-355 ◽  
Author(s):  
François Gerlotto ◽  
Mariano Gutiérrez ◽  
Arnaud Bertrand
Keyword(s):  
Population Structure ◽  
Jack Mackerel ◽  
Trachurus Murphyi

scholarly journals Effect of slaughter methods on the quality of Chilean jack mackerel (Trachurus murphyi) during refrigerated storage

2013 ◽  
Vol 52 (3) ◽  
pp. 1742-1747 ◽  
Author(s):  
Fei Lyu ◽  
Rui-Ji Huang ◽  
Lin Liu ◽  
Xuxia Zhou ◽  
Yu-Ting Ding
Keyword(s):  
Refrigerated Storage ◽  
Jack Mackerel ◽  
Trachurus Murphyi

scholarly journals A fish for all seasons: Spatial and temporal variation in patterns of demographic heterogeneity for Retropinna retropinna

2021 ◽  
Author(s):  
◽  
Christopher McDowall
Keyword(s):  
Population Dynamics ◽  
Seasonal Variation ◽  
New Zealand ◽  
Age Structure ◽  
Growth Rates ◽  
Environmental Conditions ◽  
Environmental Variation ◽  
Life Cycles ◽  
Demographic Heterogeneity ◽  
Demographic Attributes

<p>Demographic heterogeneity can have big effects on population dynamics, but for most species we have limited understanding of how and why individuals vary. Variation among individuals is of particular importance for stage-structured populations, and/or where species have ‘complex life-cycles’. This is especially relevant in the case of amphidromous fishes that typically spawn in river mouths and estuaries, develop at sea and return to freshwater to finish development. These fish face strong selection pressures as they negotiate challenges around dispersal and development in order to reproduce successfully. Quantifying variation amongst individual fish can improve understanding of their population dynamics and suggest possible drivers of variation.  I evaluate patterns and sources of variation in demographic attributes of the New Zealand smelt (Retropinna retropinna). R. retropinna is an amphidromous fish that is endemic to New Zealand. While most populations have a sea-going larval stage, a number of landlocked freshwater populations occur, with the largest landlocked population residing in Lake Taupo. Here R. retropinna are presented with a variety of littoral feeding/spawning habitats and environmental conditions that may vary across distinct regions of the lake. In addition, the protracted spawning period for this species in Lake Taupo (occurring over eight months of the year) provides additional scope for seasonal variation to influence demographic attributes of individuals.  I sampled R. retropinna from discrete coastal habitats (beach or river) that were located in the eastern, southern and western regions of the lake. I evaluated patterns of variation in the size-structure, age-structure and morphology of R. retropinna among habitats and/or regions across Lake Taupo. I used otoliths to reconstruct demographic histories (ages, growth rates, hatch dates) of individuals, and used a set of statistical models to infer spatial variation in demographic histories. I found differences in size and age structure between regions, and a temporal effect of hatch date on larval/juvenile growth rates.  In addition, I obtained samples of R. retropinna from a sea-going population at the Hutt river mouth (sampled fish were presumed to be migrating upstream after their development period in Wellington Harbour and/or adjacent coastal environments). While Lake Taupo is large, deep, fresh, oligotrophic and strongly stratified for 8-9 months outside of winter, Wellington Harbour is less than a sixth of the area, shallow, saline, eutrophic and never stratified. These greatly differing environmental conditions led me to expect that these systems’ R. retropinna populations would carry significantly different demographic attributes. I compared the hatching phenology, recruitment age, body morphology, and individual growth histories (reconstructed from otoliths) of R. retropinna sampled from Lake Taupo and Wellington Harbour. I explored the relationships between demographic variation and environmental variation (water temperature, chlorophyll a) for the two systems and found that this additional environmental information could account for much of the seasonal variation in daily otolith increment widths of R. retropinna. My results also suggest that while the two sampled populations likely share similar hatching and spawning phenologies, individuals from Lake Taupo tend to grow more slowly, particularly during winter, and end up smaller than sea-going fish sampled near Wellington. I speculate that these differences reflect variation in food supply (zooplankton may be limited in Lake Taupo over winter).  Overall, my results demonstrate a high degree of variation in morphological and life-history traits within a single species, potentially driven by an interaction between environmental variation and timing of development. My work contributes to a growing body of literature on demographic heterogeneity, and may help to inform the management of landlocked populations of R. retropinna in Lake Taupo.</p>

Fisrt record of a carangid fish,Trachurus murphyi from New Zealand

1988 ◽  
Vol 35 (2) ◽  
pp. 212-214 ◽  
Author(s):  
Shigeyuki Kawahara ◽  
Yuji Uozumi ◽  
Harumi Yamada
Keyword(s):  
New Zealand ◽  
Trachurus Murphyi
Sign in / Sign up

Export Citation Format

Share Document