Title

Data from: Impact of disease on the survival of three commercially fished species

Document Type

Data

DOI

10.5061/dryad.f56v8

Publication Date

1-1-2017

Description

Recent increases in emergent infectious diseases have raised concerns about the population stability of some marine species. The complexity and expense of studying diseases in marine systems often dictate that conservation and management decisions are made without quantitative data on population-level impacts of disease. Mark-recapture is a powerful, underutilized, tool for calculating impacts of disease on population size and structure, even in the absence of etiological information. We applied logistic regression models to mark-recapture data to obtain estimates of disease-associated mortality rates in three commercially-important marine species: snow crab (Chionoecetes opilio) in Newfoundland, Canada, that experience sporadic epizootics of bitter crab disease; striped bass (Morone saxatilis) in the Chesapeake Bay, USA, that experience chronic dermal and visceral mycobacteriosis; and American lobster (Homarus americanus) in the Southern New England stock, that experience chronic epizootic shell disease. All three diseases decreased survival of diseased hosts. Survival of diseased adult male crabs was 1% (0.003 – 0.022, 95% CI) that of uninfected crabs indicating nearly complete mortality of infected crabs in this life stage. Survival of moderately and severely diseased striped bass (which comprised 15% and 11% of the population, respectively) was 84% (70 – 100%, 95% CI), and 54% (42- 68%, 95% CI) and that of healthy striped bass. The disease-adjusted yearly natural mortality rate for striped bass was 0.29, nearly double the previously accepted value, which did not include disease. Survival of moderately and severely diseased lobsters was 30% (15 – 60%, 95% CI) that of healthy lobsters and survival of mildly diseased lobsters was 45% (27 – 75%, 95% CI) that of healthy lobsters. High disease mortality in ovigerous females may explain the poor recruitment and rapid declines observed in this population. Stock assessments should account for disease-related mortality when resource management options are evaluated.,Snow crab recapture data 2006-2008, Conception BaySnow crabs from Conception Bay that were recaptured after a tagging study initiated in 2006. DAL= days at large, M= disease status at tagging (0=healthy, 1=diseased), disease (bitter crab disease) was diagnosed by visual assessment of the carapace. Data on crabs that were not recaptured is excluded.BCD Crab.csvMD_Striped bass mark-recapture mycobacteriosisData from tag-recapture study of striped bass in Chesapeake Bay, Maryland from 2007-2011. Tag=tag identifier, rel_date= release date, dal= days at large (between tagging and recapture, NA animals were not recaptured), tl= total length at tagging, rel_dc= disease status at release (0= healthy, 1= mild diseased, 2=moderate disease, 3=severe disease, see manuscript for further description).MD_Striped bass.csvVA_Striped bass mark-recapture mycobacteriosisData from tag-recapture study of striped bass in Chesapeake Bay, Virginia from 2005-2014. Tag=tag identifier, rel_date= release date, dal= days at large (between tagging and recapture, NA animals were not recaptured), tl= total length at tagging, rel_dc= disease status at release (0= healthy, 1= mild diseased, 2=moderate disease, 3=severe disease, see manuscript for further description).VA_Striped bass.csvAmerican lobster Recapture data- LIS - Epizootic shell diseaseData on recaptures only from American lobsters tagged and recaptured by the Millstone Environmental Lab in Millstone, CT. Data file includes: tag_num: unique tag identifier, rel_month: month of tagging, rel_day: day of tagging, rel_year: year of tagging, sex, rel_carapace_length: carapace length at tagging, male:1 if male, ovig: 1 if ovigerous female at tagging, female: 1 if non-ovigerous female at tagging, dal: days at large between tagging and release, disease_status: disease status at tagging (0 is healthy, 1 is mildly diseased (<10% of carapace with lesions), 2 is moderately diseased (10-50% of carapace with lesions), 3 is severely diseased (>50% of carapace with lesions)), recap_date: date a recapture. Data on animals that were tagged and not recaptured or were recaptured in other locations are not included in this dataset.lobster recaps 1999-2015.txt,

Publisher

DRYAD

Source Link

http://datadryad.org/stash/dataset/doi:10.5061/dryad.f56v8

Version

1

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