DOI: 10.5061/dryad.f56v8
title: Data from: Impact of disease on the survival of three commercially fished species

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.
description: 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 (&lt;10% of carapace with lesions), 2 is moderately
 diseased (10-50% of carapace with lesions), 3 is severely diseased
 (&gt;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