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

Waters, D. Scott; Noble, Richard L.; Hightower, Joseph E.

doi:10.1577/t03-198.1

Cited by 25 publications

(26 citation statements)

References 9 publications

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“…Telemetry has been applied to estimate natural mortality rates (mortality rates are inferred from transmitters that stop moving over successive time periods) (Hightower et al, 2001;Waters et al, 2005). More recently, tag return data (e.g.…”

Section: Introductionmentioning

confidence: 99%

Estimating fishing and natural mortality rates for Pacific bluefin tuna (Thunnus orientalis) using electronic tagging data

Whitlock¹,

McAllister

Block³

2012

Fisheries Research

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Section: Introductionmentioning

confidence: 99%

Estimating fishing and natural mortality rates for Pacific bluefin tuna (Thunnus orientalis) using electronic tagging data

Whitlock¹,

McAllister

Block³

2012

Fisheries Research

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“…Movement patterns can be used to determine whether a tagged fish remains alive or has died because of nonharvest causes (possibly including catch-and-release or discard mortality). Movement patterns have commonly been used to identify the fate of individual telemetered fish (Jepsen et al 2000;Heupel and Simpfendorfer 2002;Waters et al 2005). Red drum movement rates were high enough that natural mortalities were not difficult to detect after a few monthly relocations.…”

Section: Assumptions Of Telemetry Methodsmentioning

confidence: 99%

“…Telemetry methods have been used by wildlife researchers to estimate the survival rates of terrestrial animals (White and Garrott 1990;Pollock et al 1995), but only recently have these methods been applied to aquatic organisms (Hightower et al 2001;Heupel and Simpfendorfer 2002;Waters et al 2005). Pollock et al (1995) developed a method to estimate survival of telemetered animals when the probability of relocation is less than one, and Hightower et al (2001) extended this approach to estimate F and M for fish populations in an aquatic setting.…”

Section: Introductionmentioning

confidence: 99%

A combined telemetry – tag return approach to estimate fishing and natural mortality rates of an estuarine fish

Bacheler

Buckel

Hightower

et al. 2009

Can. J. Fish. Aquat. Sci.

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A joint analysis of tag return and telemetry data should improve estimates of mortality rates for exploited fishes; however, the combined approach has thus far only been tested in terrestrial systems. We tagged subadult red drum (Sciaenops ocellatus) with conventional tags and ultrasonic transmitters over 3 years in coastal North Carolina, USA, to test the efficacy of the combined telemetry -tag return approach. There was a strong seasonal pattern to monthly fishing mortality rate (F) estimates from both conventional and telemetry tags; highest F values occurred in fall months and lowest levels occurred during winter. Although monthly F values were similar in pattern and magnitude between conventional tagging and telemetry, information on F in the combined model came primarily from conventional tags. The estimated natural mortality rate (M) in the combined model was low (estimated annual rate ± standard error: 0.04 ± 0.04) and was based primarily upon the telemetry approach. Using high-reward tagging, we estimated different tag reporting rates for state agency and university tagging programs. The combined telemetry -tag return approach can be an effective approach for estimating F and M as long as several key assumptions of the model are met.Résumé : Une analyse combinée du retour des étiquettes et des données de télémétrie devrait améliorer les estimations des taux de mortalité des poissons exploités; cependant, une telle approche conjointe n'a à ce jour été testée que dans les systèmes terrestres. Nous avons marqué des tambours rouges, Sciaenops ocellatus, avec des étiquettes ordinaires et des ém-etteurs à ultrasons sur une période de trois années sur la côte de la Caroline du Nord, É .-U., pour évaluer l'efficacité de l'utilisation combinée du retour des étiquettes et de la télémétrie. Il existe un fort patron saisonnier dans les estimations du taux mensuel de mortalité due à la pêche (F) faites à partir des étiquettes ordinaires et celles de télémétrie; les valeurs maximales de F s'observent à l'automne et les plus faibles en hiver. Bien que les patrons et l'importance des valeurs mensuelles de F soient semblables à partir du marquage classique et de la télémétrie, l'information sur F dans le modèle combiné provient surtout des étiquettes ordinaires. Le taux estimé de mortalité naturelle (M) dans le modèle combiné est faible (taux annuel estimé ± erreur type : 0,04 ± 0,04) et il se base principalement sur les données de télémétrie. En utilisant un programme de marquage avec de fortes récompenses, nous avons estimé des taux de retour des étiquettes différents pour les programmes menés par l'organisme de l'état et par l'université. L'approche qui combine le retour des étiquettes et la télémétrie peut être efficace pour estimer F et M à la condition que plusieurs des présuppositions principales du modèle soient respectées.[Traduit par la Rédaction]

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“…Perhaps the most feasible and reliable direct methods for estimating mortality rates are telemetry and tagging studies that can assign fates to tagged individuals; these methods have been used successfully to estimate M for some fish stocks (Hampton 2000;Hightower et al 2001;Latour et al 2001;Heupel and Simpfendorfer 2002;Pollock et al 2004;Waters et al 2005;Leigh et al 2006). It is more difficult to use tagging or telemetry methods to estimate M for crustaceans, largely because crustaceans grow by molting and may shed external tags along with the old carapace during ecdysis.…”

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confidence: 99%

Direct and Indirect Estimates of Natural Mortality for Chesapeake Bay Blue Crab

et al. 2007

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Abstract.-Analyses of the population dynamics of blue crab Callinectes sapidus have been complicated by a lack of estimates of the instantaneous natural mortality rate (M). We developed the first direct estimates of M for this species by solving Baranov's catch equation for M given estimates of annual survival rate and exploitation rate. Annual survival rates were estimated from a tagging study on adult female blue crabs in Chesapeake Bay, and female-specific exploitation rates for the same stock were estimated by comparing commercial catches with abundances estimated from a dredge survey. We also used eight published methods Our results indicate that natural mortality of blue crab is higher than previously believed, and we consider M values between 0.7 and 1.1 per year to be reasonable for the exploitable stock in Chesapeake Bay. Remaining uncertainty about M makes it necessary to evaluate a range of estimates in assessment models.The estimation of natural mortality rates is one of the most difficult and most critical elements of many fishery stock assessments. The natural mortality rate is a key determinant of the potential productivity of a stock and thus the amount of exploitation a stock can sustain. In general, assuming that natural mortality and harvest mortality are additive, stocks with higher natural mortality rates are more productive and are able to sustain higher rates of exploitation. Lacking evidence to the contrary, most stock assessments assume that natural mortality is constant through time as well as across the sizes or ages of the exploited animals. Thus, a single estimate of the instantaneous natural mortality rate (M) is presumed to apply to the entire exploitable stock.The values used for M in assessment models can have substantial effects on model results, biological conclusions, and management recommendations. For a simple age-structured model, Clark (1999) found that stock abundance and target harvest rates could be severely overestimated when M was overestimated by as little as 0.1 per year or less, especially when fishing mortality was low (F , 0.3 per year). Similarly, harvest policies for U.S. West Coast groundfish based on a catch-at-age model were sensitive to changes in M of less than 0.05 per year (Williams 2002). Using a length-structured model for red king crab Paralithodes camtschaticus in Bristol Bay, Alaska, Zheng et al. (1997a, 1997b found that stock rebuilding and longterm harvest strategies were highly sensitive to changes in M of 0.2-0.3 per year. These and other results indicate that it is desirable to have precise knowledge about M for assessment purposes.Unfortunately, estimates of M used in stock assessment models are often uncertain, partly because it is difficult and expensive to estimate the parameter. In practice, values of M for use in stock assessments are obtained by two types of methods, which we refer to as direct and indirect. Direct methods involve estimating M from data pertaining solely to the species or stock of interest. Direct methods include field ...

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

Cited by 25 publications

References 9 publications

Estimating fishing and natural mortality rates for Pacific bluefin tuna (Thunnus orientalis) using electronic tagging data

Estimating fishing and natural mortality rates for Pacific bluefin tuna (Thunnus orientalis) using electronic tagging data

A combined telemetry – tag return approach to estimate fishing and natural mortality rates of an estuarine fish

Direct and Indirect Estimates of Natural Mortality for Chesapeake Bay Blue Crab

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