TITLE:
Model for stock-recruitment dynamics of the Peruvian anchoveta (Eugraulis ringens) off Peru
AUTHORS:
Ashneel A. Singh, Kazumi Sakuramoto, Naoki Suzuki
KEYWORDS:
Anchoveta; Density-Dependent; Recruitment; Regimes; Reproductive Success; Sea Surface Temperature; Southern Oscillation Index; Spawning Stock Biomass
JOURNAL NAME:
Agricultural Sciences,
Vol.5 No.2,
February
14,
2014
ABSTRACT:
This paper was aimed at re-examining the validity of the
results from Cahuin et al. (Estuar.
Coast. Shelf Sci. 84, 2009) and identifying a model to describe the
stock-recruitment relationship of the Peruvian anchoveta (Eugraulis ringens). Regression analysis was used to determine if
density-dependent effects were present. The analysis did not show the
existence of any densitydependent effects. It is important to use environmental
factors and take observational and process errors into account when attempting
to identify density-dependent effects in fish populations. Sea surface temperature
(SST) and Southern Oscillation Index (SOI) were used as independent
variables to fit the recruitment dynamics of the anchoveta. Both SST and SOI
were found to be significantly important parameters in structuring anchoveta
dynamics according to Akaike Information Criterion (AIC) and R2 values. The results of
this study do not correlate with the
findings of Cahuin et al., (2009),
where density-dependent effects and the presence of regimes were detected. In
conclusion, the recruitment Rt is essentially determined in proportion to spawning stock biomass St, and then environmental
factors in year t further change the
recruitments. This mechanism is completely same with that for Japanese sardine
proposed by Sakuramoto (The Open Fish. Sci. 5, 2012).