FN Archimer Export Format
PT J
TI Impact of egg production and stock structure on MSY reference points and its management implications for southern hake (Merluccius merluccius)
BT 
AF CERVINO, Santiago
   DOMINGUEZ-PETIT, Rosario
   JARDIM, Ernesto
   MEHAULT, Sonia
   PINEIRO, Carmen
   SABORIDO-REY, Fran
AS 1:1;2:2;3:3,5;4:4;5:1;6:2;
FF 1:;2:;3:;4:PDG-RBE-STH-LTBH;5:;6:;
C1 Ctr Oceanog Vigo, Inst Espafiol Oceanog, Vigo 36200, Spain.
   CSIC, Inst Marine Res, Vigo 36208, Spain.
   Inst Invest Pescas & Mar IPIMAR, Lisbon, Portugal.
   Inst Francais Rech Exploitat Mer IFREMER, Lorient, France.
   European Commiss, Joint Res Ctr, Inst Protect & Secur Citizen, Maritime Affairs Unit G 04, I-21027 Ispra, VA, Italy.
C2 IEO, SPAIN
   CSIC, SPAIN
   IPIMAR, PORTUGAL
   IFREMER, FRANCE
   JRC, ITALY
SI LORIENT
SE PDG-RBE-STH-LTBH
IN WOS Ifremer jusqu'en 2018
   copubli-europe
IF 1.843
TC 20
UR https://archimer.ifremer.fr/doc/00161/27254/25487.pdf
LA English
DT Article
DE ;Egg production;Biological reference points;Steepness;Length based models;Hake
AB Spawning stock biomass (SSB) is one of the most common measures of stock status. However recent research on reproductive potential has shown that alternative variables may be an improvement over SSB. In the case of European hake (Merluccius merluccius), it is known that large individuals produce more eggs by unit of body weight, and their quality is better than those of small individuals. Under these circumstances, application of reproductive potential may be pertinent in the implementation of the Johannesburg agreement, since it is not only the spawning biomass but also its age or length structure that defines stock productivity and its ability to achieve maximum sustainable yield (MSY). In this contribution we used an age-length structured population model to assess the impact of different reproductive indices (total spawning biomass, female spawning biomass and egg production) on MSY reference points. First, we analyzed how these different indices alter our perception about per recruit productivity. Second, we analyzed the quality of these alternative reproductive indices to explain and predict recruitment using different model structures (Ricker and Beverton-Holt) and Bayesian inference. Third, we combined per recruit models and stochastic stock-recruitment relationships to estimate the probability distributions of MSY biological reference points (MSY, 'F-msy, Stock(msy), and F ash). Our results show that, for hake stocks where larger fish have a strong contribution to stock reproductive potential, use of alternative reproductive indices will affect estimations of stock sustainability. The change in perception of relative contribution of each length class is exhibited in two opposite ways: reproductive potential per recruit and the shape of the stock-recruitment relationship defined with steepness. In our case, the change from SSB to egg production, resulted in an increase in steepness which counteracted the depletion per recruit resulting in a larger F-msy.
PY 2013
PD FEB
SO Fisheries Research
SN 0165-7836
PU Elsevier Science Bv
VL 138
UT 000325236400020
BP 168
EP 178
DI 10.1016/j.fishres.2012.07.016
ID 27254
ER

EF