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Mario Cabrejos casal en infotex.com.pe
Lun Ago 20 21:40:56 PDT 2018


Journal of Fish Biology 

First published: 02 August 2018

 <https://doi.org/10.1111/jfb.13773> https://doi.org/10.1111/jfb.13773


 


Daily growth patterns and age坼at坼recruitment of the anchoveta Engraulis
ringens as indicated by a multi坼annual analysis of otolith microstructure
across developmental stages


 
<https://onlinelibrary.wiley.com/action/doSearch?ContribAuthorStored=Plaza%2
C+G> G. Plaza
<https://onlinelibrary.wiley.com/action/doSearch?ContribAuthorStored=Cerna%2
C+F> F. Cerna
<https://onlinelibrary.wiley.com/action/doSearch?ContribAuthorStored=Landaet
a%2C+MF> M.F. Landaeta
<https://onlinelibrary.wiley.com/action/doSearch?ContribAuthorStored=Hern%C3
%A1ndez%2C+A> A. Hern芍ndez
<https://onlinelibrary.wiley.com/action/doSearch?ContribAuthorStored=Contrer
as%2C+JE> J.E. Contreras

 


Abstract


Daily age and length patterns of anchoveta Engraulis ringens were analysed
the sagittal otoliths from wild larvae (0每0.2 cm standard length, LS), pre
坼recruits (3每6 cm total length, LT), recruits (7每12 cm LT) and young
adults (12每15 cm LT). Additionally, variability in growth and age at
recruitment (AR) were evaluated for recruits caught in northern Chile in
1973, 1982, 2009, 2010, 2012, 2013, 2014 and 2015. The age每length
relationship showed four allometric patterns that were well described by
Laird坼Gompertz models. The absolute growth rates at the inflexion point
(GAR) were 0.56, 0.75, 1.22 and 1.16 mm d每1 for larvae, pre坼recruits,
recruits and young adults, respectively. At the interannual scale, GAR
values were always > 1 mm d每1 (mean ㊣ S.D. 1.37 ㊣ 0.21 mm d每1; range
1.12每1.64 mm d每1), irrespective of the season of hatching (i.e. winter v.
spring); additionally, in most cases, GAR values were reached before the
second month of life (mean ㊣ S.D. 50.47 ㊣ 9.73 days) at c. 4 cm LT (mean
㊣ S.D. 4.22 ㊣ 0.29 cm). Mean AR was < 150 days (112 ㊣ 29 days; range 75每
149 days); in contrast, estimates of AR were higher and growth rates were
lower in 1973, 1983 and 200. These results demonstrate very fast growth and
early AR of anchoveta in northern Chile, suggesting most fish are removed by
the fisheries at very early ages. An evaluation of the implications of these
results on stock assessment and management of this species is highly
recommended.

 



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