Regulation of fish stocks without stock-recruitment relationships: the case of small pelagic fish

T. Mariella Canales; Gustav W Delius; Richard Law

doi:10.1111/faf.12465

Regulation of fish stocks without stock-recruitment relationships: the case of small pelagic fish

T. Mariella Canales, Gustav W Delius, Richard Law

Mathematics

Research output: Contribution to journal › Article › peer-review

Abstract

Small pelagic fish lack clear stock-recruitment relationships. This is a problem because such relationships are taken to be the primary descriptors of density dependence, responsible for regulating population density. In this paper, we show that small pelagic fish species, anchovy (Engraulis spp, Engraulidae), living in a stochastic environment, can be strongly regulated without a stock-recruitment relationship emerging. This is done through numerical analysis of a size-spectrum model, in which fish grow by eating and die in part from being eaten, with the result that birth, growth and death are all density dependent. The model includes cannibalism, and growth-dependent larval mortality, both of which have been suggested as regulatory mechanisms in anchovy, together with growth and reproduction later in life. Despite the lack of a clear stock-recruitment relationship in the presence of stochasticity, signals of density dependence in the vital rates remain clear, suggesting that they might prove to be better indicators of density dependence than stock-recruitment relationships in small pelagic fish.

Original language	English
Pages (from-to)	857-871
Number of pages	15
Journal	Fish and fisheries
Volume	21
Issue number	5
DOIs	https://doi.org/10.1111/faf.12465
Publication status	Published - 2 Sept 2020

Bibliographical note

© 2020 John Wiley & Sons Ltd. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

Access to Document

10.1111/faf.12465

DD_anchovy_3
© 2020 John Wiley & Sons Ltd. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.
Accepted author manuscript, 411 KBLicence: Unspecified

Cite this

@article{483d94f0e03447399d3188532287e821,

title = "Regulation of fish stocks without stock-recruitment relationships: the case of small pelagic fish",

abstract = "Small pelagic fish lack clear stock-recruitment relationships. This is a problem because such relationships are taken to be the primary descriptors of density dependence, responsible for regulating population density. In this paper, we show that small pelagic fish species, anchovy (Engraulis spp, Engraulidae), living in a stochastic environment, can be strongly regulated without a stock-recruitment relationship emerging. This is done through numerical analysis of a size-spectrum model, in which fish grow by eating and die in part from being eaten, with the result that birth, growth and death are all density dependent. The model includes cannibalism, and growth-dependent larval mortality, both of which have been suggested as regulatory mechanisms in anchovy, together with growth and reproduction later in life. Despite the lack of a clear stock-recruitment relationship in the presence of stochasticity, signals of density dependence in the vital rates remain clear, suggesting that they might prove to be better indicators of density dependence than stock-recruitment relationships in small pelagic fish.",

author = "Canales, {T. Mariella} and Delius, {Gustav W} and Richard Law",

note = "{\textcopyright} 2020 John Wiley & Sons Ltd. This is an author-produced version of the published paper. Uploaded in accordance with the publisher{\textquoteright}s self-archiving policy. Further copying may not be permitted; contact the publisher for details.",

year = "2020",

month = sep,

day = "2",

doi = "10.1111/faf.12465",

language = "English",

volume = "21",

pages = "857--871",

journal = "Fish and fisheries",

issn = "1467-2960",

publisher = "Wiley-Blackwell",

number = "5",

}

TY - JOUR

T1 - Regulation of fish stocks without stock-recruitment relationships

T2 - the case of small pelagic fish

AU - Canales, T. Mariella

AU - Delius, Gustav W

AU - Law, Richard

N1 - © 2020 John Wiley & Sons Ltd. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details.

PY - 2020/9/2

Y1 - 2020/9/2

N2 - Small pelagic fish lack clear stock-recruitment relationships. This is a problem because such relationships are taken to be the primary descriptors of density dependence, responsible for regulating population density. In this paper, we show that small pelagic fish species, anchovy (Engraulis spp, Engraulidae), living in a stochastic environment, can be strongly regulated without a stock-recruitment relationship emerging. This is done through numerical analysis of a size-spectrum model, in which fish grow by eating and die in part from being eaten, with the result that birth, growth and death are all density dependent. The model includes cannibalism, and growth-dependent larval mortality, both of which have been suggested as regulatory mechanisms in anchovy, together with growth and reproduction later in life. Despite the lack of a clear stock-recruitment relationship in the presence of stochasticity, signals of density dependence in the vital rates remain clear, suggesting that they might prove to be better indicators of density dependence than stock-recruitment relationships in small pelagic fish.

AB - Small pelagic fish lack clear stock-recruitment relationships. This is a problem because such relationships are taken to be the primary descriptors of density dependence, responsible for regulating population density. In this paper, we show that small pelagic fish species, anchovy (Engraulis spp, Engraulidae), living in a stochastic environment, can be strongly regulated without a stock-recruitment relationship emerging. This is done through numerical analysis of a size-spectrum model, in which fish grow by eating and die in part from being eaten, with the result that birth, growth and death are all density dependent. The model includes cannibalism, and growth-dependent larval mortality, both of which have been suggested as regulatory mechanisms in anchovy, together with growth and reproduction later in life. Despite the lack of a clear stock-recruitment relationship in the presence of stochasticity, signals of density dependence in the vital rates remain clear, suggesting that they might prove to be better indicators of density dependence than stock-recruitment relationships in small pelagic fish.

U2 - 10.1111/faf.12465

DO - 10.1111/faf.12465

M3 - Article

SN - 1467-2960

VL - 21

SP - 857

EP - 871

JO - Fish and fisheries

JF - Fish and fisheries

IS - 5

ER -