Non‐diadromous life history and limited movement in northern lineages of Australian smelt: Evidence from otolith chemistry analysis

2018 ◽  
Vol 28 (2) ◽  
pp. 229-240
Author(s):  
Md Rakeb‐Ul Islam ◽  
Daniel J. Schmidt ◽  
David A. Crook ◽  
Jane M. Hughes

2016 ◽  
Vol 179 ◽  
pp. 104-114 ◽  
Author(s):  
A. Riou ◽  
G. Bareille ◽  
F. Morat ◽  
K. Pothin ◽  
N. Bru ◽  
...  


Author(s):  
Travis Elsdon ◽  
Brian Wells ◽  
Steven Campana ◽  
Bronwyn Gillanders ◽  
Cynthia Jones ◽  
...  


2016 ◽  
Vol 67 (10) ◽  
pp. 1434 ◽  
Author(s):  
D. M. Parsons ◽  
M. A. Morrison ◽  
B. M. Gillanders ◽  
K. D. Clements ◽  
S. J. Bury ◽  
...  

Defining appropriate management units to balance productivity and yield of exploited species is fundamental to effective resource management. Anecdotal and tag–recapture information related to morphology, movement behaviour and life-history strategy suggest that separate groups of snapper (Chrysophrys auratus) exist in the Hauraki Gulf, New Zealand. To address the existence of discrete groups, we examined morphology, meristics and otolith chemistry from snapper collected throughout the Hauraki Gulf. We also used tag–recapture information, stable isotope analysis and interpreted functional aspects of morphology and meristics data to understand potential life-history strategy differences. Snapper from rocky reef habitats did not display morphology and meristic features distinct from snapper from soft sediment habitats and differences in otolith chemistry and stable isotope ratios could respectively be explained by a locational influence and predominance of kelp in rocky reef food webs. Conversely, snapper collected from a known spawning area had distinct morphological and meristic features consistent with semi–pelagic sparids and stable isotope analysis also indicated a potentially more pelagic and higher trophic-level diet. Maintenance of population complexity such as this is generally beneficial to fish populations, and can be achieved by revisiting the spatial units used for fishery management.



2017 ◽  
Vol 68 (8) ◽  
pp. 1554 ◽  
Author(s):  
D. A. Crook ◽  
D. J. Buckle ◽  
Q. Allsop ◽  
W. Baldwin ◽  
T. M. Saunders ◽  
...  

Migration is a fundamental aspect of the life history of many fish and must be well understood for targeted conservation and management. We used acoustic telemetry and otolith 87Sr/86Sr analysis, in conjunction with annual ageing, to study intraspecific variation in barramundi Lates calcarifer migration in the Northern Territory, Australia. Acoustic transmitters were implanted into 25 barramundi (420–1010-mm total length (TL); median 510mm TL) from freshwater reaches of the South Alligator River and their movements tracked over >2 years. 87Sr/86Sr transect analysis was also conducted on otoliths of 67 barramundi from the Daly, Mary, South Alligator and Roper rivers. Acoustic telemetry showed that most fish remained in fresh water across wet and dry seasons. Higher rates of movement occurred during the wet season and a minority of fish moved into the estuary during high flows. Otolith chemistry analyses revealed high diversity in salinity histories among individuals. We integrated the telemetry and otolith chemistry data to examine migration as a function of the stage of sexual development, and have proposed a revised life history model that identifies three migratory contingents. We conclude that anthropogenic disturbance, including modified river hydrology, has the potential to alter the frequency of life history contingents in barramundi populations.



2020 ◽  
Vol 651 ◽  
pp. 111-123
Author(s):  
PJ Sanchez ◽  
JR Rooker ◽  
M Zapp Sluis ◽  
J Pinsky ◽  
MA Dance ◽  
...  

Chemical markers in otoliths have been used to assess the stock structure of many marine fishes, but these natural markers have yet to be widely evaluated or applied to demersal fishes in offshore habitats where physicochemical gradients are generally less pronounced relative to nearshore waters. To address this, we quantified trace elements (Li, Mg, Mn, Co, Cu, Zn, Sr, Ba) and stable isotopes (δ13C and δ18O) in otoliths of Warsaw grouper Hyporthodus nigritus from 4 regions in the Gulf of Mexico (Texas, Louisiana, Alabama-NW Florida, and SW Florida). Region-specific differences in otolith chemistry were observed, and notable differences in several influential markers (Mn:Ca, Sr:Ca, and Ba:Ca ratios and δ18O) were present, particularly between the most distant regions investigated (Texas/Louisiana and SW Florida). Distinct regional signatures were observed for Warsaw grouper across 3 life history stages: first year (otolith core), most recent years (otolith edge), and lifetime (whole otolith), suggesting that individuals within certain regions share common environmental histories that may represent unique contingents or sub-populations. Findings also demonstrate that spatial variability within these markers was consistent enough to overcome any temporal variability within the geographic domains investigated for all 3 life history stages, highlighting their potential value for assessing the natal origin, exchange, and population structure of this species and potentially other members of the deepwater fish assemblage.



Coral Reefs ◽  
2005 ◽  
Vol 24 (2) ◽  
pp. 222-229 ◽  
Author(s):  
Heather M. Patterson ◽  
Michael J. Kingsford ◽  
Malcolm T. McCulloch


2019 ◽  
Vol 42 ◽  
Author(s):  
Boris Kotchoubey

Abstract Life History Theory (LHT) predicts a monotonous relationship between affluence and the rate of innovations and strong correlations within a cluster of behavioral features. Although both predictions can be true in specific cases, they are incorrect in general. Therefore, the author's explanations may be right, but they do not prove LHT and cannot be generalized to other apparently similar processes.



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