Estimation of the Coefficient of Tag Shedding from Drifting Seaweed

Polycyclic aromatic hydrocarbon (PAH) concentrations in wharf roach (Ligia spp.), as an environmental indicator, and in environmental components of the intertidal and supralittoral zones were determined, and the PAH exposure pathways in wharf roach were estimated. Wharf roaches, mussels, and environmental media (water, soil and sand, and drifting seaweed) were collected from 12 sites in Japan along coastal areas of the Sea of Japan. PAH concentrations in wharf roaches were higher than those in mussels (median total of 15 PAHs: 48.5 and 39.9 ng/g-dry weight (dw), respectively) except for samples from Ishikawa (wharf roach: 47.9 ng/g-dw; mussel: 132 ng/g-dw). The highest total PAH concentration in wharf roach was from Akita (96.0 ng/g-dw), followed by a sample from Niigata (85.2 ng/g-dw). Diagnostic ratio analysis showed that nearly all PAHs in soil and sand were of petrogenic origin. Based on a correlation analysis of PAH concentrations between wharf roach and the environmental components, wharf roach exposure to three- and four-ring PAHs was likely from food (drifting seaweed) and from soil and sand, whereas exposure to four- and five-ring PAHs was from several environmental components. These findings suggest that the wharf roach can be used to monitor PAH pollution in the supralittoral zone and in the intertidal zone.

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First marlin archival tagging study suggests new direction for research

Marine and Freshwater Research ◽

10.1071/mf18160 ◽

2019 ◽

Vol 70 (4) ◽

pp. 603 ◽

Cited By ~ 2

Author(s):

Michael L. Domeier ◽

Sofia Ortega-Garcia ◽

Nicole Nasby-Lucas ◽

Paxson Offield

Keyword(s):

Peritoneal Cavity ◽

Baja California ◽

Tracking Data ◽

Recovery Rates ◽

Geographic Position ◽

Archival Tags ◽

Fish Tracking ◽

Tag Shedding

Decades of billfish tagging studies have been hindered by below-par conventional tag recovery rates and high rates of premature satellite pop-up tag shedding. With hopes of obtaining long-term tracking data, we performed the world’s first archival tagging study on an istiophorid, surgically implanting 99 archival tags into the peritoneal cavity of striped marlin (Kajikia audax) off the coast of Baja California, Mexico. Marlin were also tagged externally with a conventional tag before release. Ten archival tags (10.1%) were recovered with days at liberty (DAL) ranging from 400 to 2795. Nine recoveries were from Mexican waters, whereas one marlin was recaptured off Ecuador. In total, 100% of the light stalks on the archival tags failed, with nine failing within the first 3 months of deployment; because the light data are used to estimate the geographic position of the tagged fish, tracking data were compromised. The absence of conventional tags on all recaptured marlin indicates that studies of marlin using conventional tags have been hindered by tag shedding rather than tagging-associated mortality or underreporting. Our high recapture rate and long DAL suggest istiophorid science could be greatly advanced by archival tagging if new tag designs or methods can eliminate tag failure.

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Modeling data from double-tagging experiments to estimate heterogeneous rates of tag shedding in lake trout (Salvelinus namaycush)

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f99-069 ◽

1999 ◽

Vol 56 (8) ◽

pp. 1409-1419 ◽

Cited By ~ 6

Author(s):

Mary C Fabrizio ◽

James D Nichols ◽

James E Hines ◽

Bruce L Swanson ◽

Stephen T Schram

Keyword(s):

Lake Trout ◽

Survival Rates ◽

Salvelinus Namaycush ◽

Wild Fish ◽

Retention Rates ◽

Type I ◽

Tag Retention ◽

Tag Loss ◽

Modeling Data ◽

Tag Shedding

Data from mark-recapture studies are used to estimate population rates such as exploitation, survival, and growth. Many of these applications assume negligible tag loss, so tag shedding can be a significant problem. Various tag shedding models have been developed for use with data from double-tagging experiments, including models to estimate constant instantaneous rates, time-dependent rates, and type I and II shedding rates. In this study, we used conditional (on recaptures) multinomial models implemented using the program SURVIV (G.C. White. 1983. J. Wildl. Manage. 47: 716-728) to estimate tag shedding rates of lake trout (Salvelinus namaycush) and explore various potential sources of variation in these rates. We applied the models to data from several long-term double-tagging experiments with Lake Superior lake trout and estimated shedding rates for anchor tags in hatchery-reared and wild fish and for various tag types applied in these experiments. Estimates of annual tag retention rates for lake trout were fairly high (80-90%), but we found evidence (among wild fish only) that retention rates may be significantly lower in the first year due to type I losses. Annual retention rates for some tag types varied between male and female fish, but there was no consistent pattern across years. Our estimates of annual tag retention rates will be used in future studies of survival rates for these fish.

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Tag-shedding rates for tropical tuna species in the Atlantic Ocean estimated from double-tagging data

Fisheries Research ◽

10.1016/j.fishres.2021.106211 ◽

2022 ◽

Vol 248 ◽

pp. 106211

Author(s):

D. Gaertner ◽

L. Guéry ◽

N. Goñi ◽

J. Amande ◽

P. Pascual Alayon ◽

...

Keyword(s):

Atlantic Ocean ◽

Tropical Tuna ◽

Tag Shedding

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Estimating migration rates from two tag–release/one recovery experiments

ICES Journal of Marine Science ◽

10.1016/j.icesjms.2004.01.006 ◽

2004 ◽

Vol 61 (5) ◽

pp. 821-828 ◽

Cited By ~ 2

Author(s):

Kunio Shirakihara ◽

Shuichi Kitada

Keyword(s):

Experimental Design ◽

Coefficient Of Variation ◽

Migration Rate ◽

Skipjack Tuna ◽

Survey Area ◽

Time Intervals ◽

Migration Rates ◽

Movement Rates ◽

Recovery Techniques ◽

Tag Shedding

Abstract We propose a method for estimating migration (movement) rates from two tag–release/one recovery experiments, regardless of tag-shedding or incomplete tag-reporting which are major problems when tag–recovery techniques are applied to commercially exploitable populations. The entire survey area is divided into multiple strata in advance. The first release is limited to one stratum; then, the second release occurs in every stratum. Recoveries from both releases occur in every stratum. The migration rate between the time of the first and second release is estimated together with its variance. To check the applicability of our method, we applied it to tag–recovery data for skipjack tuna from various places at different times and unequal time intervals. The precision of the estimates was low and the coefficient of variation was 22.6–42.1% because of the small number of recoveries. The experimental design necessary to improve precision is discussed.

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Preliminary observations of tag shedding, tag reporting, tag wounds, and tag biofouling for raggedtooth sharks (Carcharias taurus) tagged off the east coast of South Africa

ICES Journal of Marine Science ◽

10.1016/j.icesjms.2006.06.009 ◽

2006 ◽

Vol 63 (9) ◽

pp. 1640-1648 ◽

Cited By ~ 21

Author(s):

M.L. Dicken ◽

A.J. Booth ◽

M.J. Smale

Keyword(s):

South Africa ◽

East Coast ◽

Telephone Survey ◽

Total Length ◽

Significant Difference ◽

Juvenile Sharks ◽

Carcharias Taurus ◽

Tag Shedding

Abstract A double-tagging experiment and integrated on-site questionnaire and telephone survey were used to investigate aspects of tag shedding, tag reporting, tag wounds, and tag biofouling for the raggedtooth shark (Carcharias taurus), tagged off the east coast of South Africa. Between 2002 and 2004, 84 juvenile (<1.8 m total length, TL), and 24 adult (>1.8 m TL) C. taurus were double-tagged. Of these, 11 juvenile and six adult double-tagged sharks were recaptured. Significantly, more tags were shed from adult than from juvenile sharks, and there was also a significant difference between the number of anterior and posterior tags shed. Rates of tag reporting were estimated from a survey of 477 randomly selected shore-anglers, and they varied both temporally and spatially from 27% to 100%. In all, 93 tag recaptures were reported in the survey, most (75.3%) with some biofouling. Tag-inflicted damage was reported in 35.5% of recaptured sharks, and the incidence of tag-inflicted damage was greater for disk (77.8%) than for dart tags (25.3%).

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Comparison of Three Nonlinear Models to Describe Long-Term Tag Shedding by Lake Trout

Transactions of the American Fisheries Society ◽

10.1577/1548-8659(1996)125<0261:cotnmt>2.3.co;2 ◽

1996 ◽

Vol 125 (2) ◽

pp. 261-273 ◽

Cited By ~ 23

Author(s):

Mary C. Fabrizio ◽

Bruce L. Swanson ◽

Stephen T. Schram ◽

Michael H. Hoff

Keyword(s):

Lake Trout ◽

Nonlinear Models ◽

Tag Shedding

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Multiyear tagging studies incorporating fishing effort data

Canadian Journal of Fisheries and Aquatic Sciences ◽

10.1139/f97-256 ◽

1998 ◽

Vol 55 (6) ◽

pp. 1466-1476 ◽

Cited By ~ 54

Author(s):

John M Hoenig ◽

Nicholas J Barrowman ◽

William S Hearn ◽

Kenneth H Pollock

Keyword(s):

Mortality Rate ◽

Additional Data ◽

Survival Rates ◽

Fishing Effort ◽

Reporting Rate ◽

Natural Mortality ◽

Fishing Mortality ◽

Recovery Rates ◽

Sampling Survey ◽

Tag Shedding

The Brownie models for multiyear tagging studies can be used to estimate age- and year-specific annual survival rates and tag recovery rates. The latter are composites of the exploitation rates and rates of tag reporting, tag shedding, and tag-induced mortality. It is possible to estimate the exploitation rates if the other components of the tag recovery rates can be quantified. Instantaneous rates of fishing and natural mortality can be estimated if information is available on the seasonal distribution of fishing effort. The estimated rates are only moderately dependent on the timing of the fishing; consequently, the relative effort data can be crude. Information on the timing of the catch over the course of the year can be used as a substitute for the effort data. Fishing mortality can also be assumed to be proportional to fishing effort over years; consequently, if fishing effort is known then the tag reporting rate, natural mortality rate, and a single catchability coefficient can be estimated (instead of natural mortality and a series of fishing mortalities). Although it is possible in theory to estimate both the tag reporting rate and the natural mortality rate with all of these models, in practice it appears necessary to obtain some additional data relating to tag reporting rate to obtain acceptable results. The additional data can come from a variable reward tagging study, a creel or port sampling survey, or from tagged animals that are secretly added to the fishers' catches.

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