Implications of compensatory and additive mortality to the management of selected sportfish populations

Allen, Micheal S.; Miranda, Leandro E.; Brock, Richard

doi:10.1111/j.1440-1770.1998.tb00033.x

Cited by 74 publications

(81 citation statements)

References 33 publications

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“…These yield models are based on the assumption that natural and fishing mortality rates are additive rather than compensatory. This assumption is supported by a review of published estimates of exploitation and total mortality rates for largemouth bass (Allen et al 1998).…”

Section: Discussionmentioning

confidence: 96%

Fishing and Natural Mortality of Adult Largemouth Bass in a Tropical Reservoir

2005

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Largemouth bass Micropterus salmoides, an intensively studied sport fish of temperate North America, has been introduced into tropical regions, but with little evaluation of fishing or natural mortality rates. Previous research in Puerto Rico suggested that annual mortality rates are high, but whether the extended spawning season (nearly 6 months annually), high angler harvest, or a combination was the cause of the elevated mortality was unresolved. Using ultrasonic telemetry, we tracked 44 adult largemouth bass over an 18‐month period to quantify patterns of natural, fishing, and total mortality. Using a general capture–recapture model, we estimated the annual instantaneous rates of fishing (0.584, SE = 0.164) and natural mortality (0.310, SE = 0.122). Natural mortality varied seasonally and generally increased during periods of spawning activity; however, fishing mortality was fairly consistent throughout the study. Given the relatively high fishing mortality rate, restrictions on harvest could probably be used to alter the age and size distribution of this population.

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Section: Discussionmentioning

confidence: 96%

Fishing and Natural Mortality of Adult Largemouth Bass in a Tropical Reservoir

2005

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“…By assuming 0% tag loss, managers are underestimating exploitation and fishing mortality rates and thus overestimating natural mortality rates. Fishing and natural mortality rates are generally accepted to be compensatory risks of death for certain fish species, i.e., natural mortality decreases as fishing mortality increases (Allen et al 1998). By overestimating natural mortality, managers might believe that exploitation and fishing mortality can be increased, thereby leading to overfishing of the stock.…”

Section: Discussionmentioning

confidence: 98%

Impacts of Anchor Tag Loss on Walleye Management in the Winnebago System

Koenigs

Bruch

Kamke

2013

N American J Fish Manag

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Rates of tag loss should be estimated and accounted for when using mark–recapture surveys and angler tag returns to estimate fish population abundance and exploitation rates. Walleyes Sander vitreus sampled during April 2010 spawning assessments conducted in the Winnebago system, Wisconsin, were marked with anchor tags and upper caudal fin clips to estimate tag loss rates during three time intervals: 0–11 d posttagging, 0–90 d posttagging, and 1 year posttagging. Tag loss was negligible (<0.5%) within the first 11 d but increased to 4.7% within the first 90 d and to 21.9% after 1 year. After we corrected for the tag loss occurring within the first 90 d, estimates of population abundance decreased 4.3% for females and 4.4% for males, while estimates of exploitation increased 4.9% for both sexes. Accounting for 21.9% annual tag loss led to more severe decreases in the estimates of population abundance (20.0% for females and 21.2% for males) and increases in the estimates of exploitation (28.0% for both sexes) than not accounting for any tag loss. Higher exploitation rates resulted in higher estimates of fishing mortality and lower estimates of natural mortality. When used in yield‐per‐recruit models, the estimated natural mortality rates derived from exploitation rates that accounted for tag loss resulted in higher yields through the implementation of larger minimum length limits to maximize yield. We recommend that managers evaluate the effectiveness of their tagging operations by estimating tag loss and assessing the potential impacts of quantified loss on management metrics. We also caution against the application of population models without an accurate estimate of tag loss and the associated impacts on estimates of population abundance and exploitation and, in turn, fishing and natural mortality rates. Received May 22, 2013; accepted June 11, 2013

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“…Although lake productivity was only a marginally important variable in the relationship between density and growth for the Minnesota lakes data, it became more significant in the pooled data. In a survey of the literature Allen et al (1998) found exploitation may be compensatory for pike less than 40 cm total length (cannibalism was reduced; natural mortality decreased to compensate for the exploitation and total mortality remained near constant) but became additive (i.e. total mortality increased) in larger fish.…”

Section: Population Dynamicsmentioning

confidence: 95%

A short review of pike ecology

Craig¹

2008

Hydrobiologia

141

122

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A brief review is provided in some advances in understanding the ecology of pike Esox lucius Linnaeus over the last 10 years. Based on longterm studies and manipulative, often short-term experiments (laboratory, field and mesocosms) several established theories have been supported, as well as new concepts developed. Despite their wide distribution pike show low levels of polymorphism and divergence indicative of a recent common ancestral population. Recent genetic studies, however, indicate a single refugium in North America compared to several refugia in Europe. Pike are found in rivers, lakes and weakly saline waters. Variables such as growth and mortality are mainly affected by factors such as temperature, water transparency, productivity, availability of prey and density of pike and other predators. In choice of habitat pike have been shown to support the ideal free-distribution theory. The importance of macrophyte habitat in the life history of pike has been reconfirmed and pike have been shown to be flexible in response to water clarity. Pike are extremely 'plastic' in choice of prey types, prey size and in response to prey behaviour (e.g. they are unaffected by shoal size). Predation by pike not only affects abundance and biomass of prey (including younger and smaller pike through cannibalism which plays a major role in population dynamics, other fishes and invertebrates) but also evolution and adaptation of their morphology (in particular body shape) and behaviours. There appears to be no relationship between stock and recruitment. Recruitment is influenced by several abiotic factors in lakes and rivers. Pike play a major role in structuring freshwater communities and have been used in stocking programmes to improve water quality (biomanipulation). Many new concepts have been developed in pike behaviour in maximizing these stocking programmes both in biomanipulation and fisheries management. Despite many recent advances in understanding the ecology of pike, particularly at the individual level, developments in quantifying and modelling the role of pike as a top predator in large ecosystems have been limited, probably due to the difficulties of sampling natural populations.

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Implications of compensatory and additive mortality to the management of selected sportfish populations

Cited by 74 publications

References 33 publications

Fishing and Natural Mortality of Adult Largemouth Bass in a Tropical Reservoir

Fishing and Natural Mortality of Adult Largemouth Bass in a Tropical Reservoir

Impacts of Anchor Tag Loss on Walleye Management in the Winnebago System

A short review of pike ecology

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