{"id":13086,"date":"2020-11-18T14:49:56","date_gmt":"2020-11-18T19:49:56","guid":{"rendered":"https:\/\/ncseagrant.ncsu.edu\/news\/?p=13086"},"modified":"2020-11-18T14:49:56","modified_gmt":"2020-11-18T19:49:56","slug":"some-sport-fish-are-caught-repeatedly-which-could-throw-off-population-estimates","status":"publish","type":"post","link":"https:\/\/ncseagrant.ncsu.edu\/some-sport-fish-are-caught-repeatedly-which-could-throw-off-population-estimates\/","title":{"rendered":"Some Sport Fish Are Caught Repeatedly \u2013 Which Could Throw Off Population Estimates"},"content":{"rendered":"
\"Researcher<\/a>
Researcher Brendan Runde with a red grouper. Photo credit: Owen Mulvey-McFerron.<\/figcaption><\/figure>\n

For Immediate Release<\/strong><\/p>\n

Contact<\/strong>:
\nJeff Buckel, <\/span>jabuckel@ncsu.edu<\/a>
\nBrendan Runde, <\/span>bjrunde@ncsu.edu<\/a>
\nMatt Shipman, <\/span>matt_shipman@ncsu.edu<\/a><\/p>\n

\n

NOAA and North Carolina Sea Grant funded this research.<\/strong><\/em><\/p>\n

A new study reports that, for several species of oceanic sport fish, individual fish that are caught, released and recaught are more likely to be caught again than scientists anticipated. The findings raise some interesting questions for policy makers tasked with preserving sustainable fisheries.<\/p>\n

The study makes use of data from tagging programs<\/a>, in which researchers tag fish and release them into the wild. When those fish are caught, and the tag information is returned to the researchers, it can give scientists information that informs fishery policies.<\/p>\n

\u201cFisheries researchers who work in tagging programs have long noticed that certain fish seem to get caught repeatedly, and we set out to determine the implications of this phenomenon,\u201d says Jeff Buckel, co-author of the study and a professor of applied ecology at North Carolina State University.<\/p>\n

To that end, researchers examined decades\u2019 worth of Atlantic coast tagging datasets on four fish species: black sea bass (Centropristis striata<\/em>), gray triggerfish (Balistes capriscus<\/em>), red grouper (Epinephelus morio<\/em>), and Warsaw grouper\u00a0(Hyporthodus nigritus<\/em>). Using a computational model, the researchers determined that \u2013 for the black sea bass and both types of grouper \u2013 survival was significantly higher after the second, third, and fourth release as compared to the first release.<\/p>\n

\u201cThink of it this way,\u201d says Brendan Runde, first author of the study and a Ph.D. student at NC\u00a0State. \u201cLet\u2019s say you tagged 1,000 fish and recaptured 100 of them for a first time. After re-releasing those 100 fish, you would only expect to recapture 10 of them a second time. But that\u2019s not what we\u2019re seeing. We\u2019re seeing much higher numbers of fish getting recaptured after the second time.<\/p>\n

\u201cOur hypothesis is that this increase in catch rate stems from selection for robust individuals,\u201d Runde says.<\/p>\n

In other words, because some fish don\u2019t survive the first release, and you can\u2019t catch a dead fish, the fish that were robust enough to survive their first encounter were more likely to survive following catch-and-release events.<\/p>\n

The finding could have a significant impact on stock assessments, which inform fishery policies.<\/p>\n

\u201cIt\u2019s exciting to have scientific data showing that catch-and-release works in letting fish live for another day,” says Sara Mirabilio, fisheries specialist with North Carolina Sea Grant and co-author of the popular Hook, Line & Science<\/a> blog series. “It does present some challenges to traditional population modeling, so it\u2019s great to have research, such as this study, begin to resolve those data challenges.\u201d<\/p>\n

\u201cOne might assume that every catch and release in a recreational fishery is a unique fish,\u201d Buckel says. \u201cSo that if 5 million black sea bass were caught and released in a given year, that would mean there were at least 5 million black sea bass in a fishery. For these three species of fish and likely many others, that\u2019s just not true. At least some of those 5 million catches were the same fish getting caught over and over again.\u201d<\/p>\n

\u201cReliable estimates of how many unique fish are released are critical to accurately assessing the health of the population,\u201d says Kyle Shertzer, a co-author of the study and stock assessment scientist at NOAA Fisheries.<\/p>\n

\u201cOn the positive side, the study also suggests that for many species fish mortality from being released appears lower than we thought,\u201d Buckel says. \u201cFor those species, if a fish survives its first release, it has an even better chance of surviving subsequent releases.\u201d<\/p>\n

\u201cWe think that the issues raised by our findings are likely relevant for many marine fish stock assessments that rely on catch-and-release data \u2013 though this will vary based on the species and the details of how each stock assessment is performed,\u201d Runde says.<\/p>\n

The paper, \u201cRepetitive capture of marine fishes: implications for estimating number and mortality of releases<\/a>,\u201d is published in the ICES Journal of Marine Science<\/em>. The paper was co-authored by Paul Rudershausen, a research scholar in NC\u00a0State\u2019s Department of Applied Ecology; Nate Bacheler of NOAA Fisheries; and Beverly Sauls of the Florida Fish and Wildlife Research Institute.<\/p>\n

The work was done with support from NOAA, under grants NA14NMF4540061, NA09NMF4720265 and NA09NMF4540140; and from North Carolina Sea Grant Fishery Resource Grant projects 07-FEG-01 and 11-FEG-04.<\/em><\/p>\n

Read the latest science for anglers at HookLineScience.com<\/a><\/em>.<\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

\u201cThink of it this way,\u201d says Brendan Runde, first author of the study and a Ph.D. student at NC\u00a0State. \u201cLet\u2019s say you tagged 1,000 fish and recaptured 100 of them for a first time. After re-releasing those 100 fish, you would only expect to recapture 10 of them a second time. But that\u2019s not what we\u2019re seeing.”<\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"ncst_custom_author":"","ncst_show_custom_author":false,"ncst_dynamicHeaderBlockName":"","ncst_dynamicHeaderData":"","ncst_content_audit_freq":"","ncst_content_audit_date":"","ncst_content_audit_display":false,"ncst_backToTopFlag":"","footnotes":""},"categories":[1391],"tags":[512,502,499,513,505,506,511,510,500,508,507,501,17,20,413,24,503,509,15,498,504],"_ncst_magazine_issue":[],"class_list":["post-13086","post","type-post","status-publish","format-standard","hentry","category-research","tag-beverly-sauls","tag-black-sea-bass","tag-brendan-runde","tag-florida-fish-and-wildlife","tag-gray-triggerfish","tag-hook","tag-ices","tag-ices-journal-of-marine-science","tag-jeff-buckel","tag-kyle-shertzer","tag-line-science","tag-matt-shipman","tag-nc-state","tag-noaa","tag-noaa-fisheries","tag-north-carolina-sea-grant","tag-red-grouper","tag-repetitive-capture-of-marine-fishes-implications-for-estimating-number-and-mortality-of-releases","tag-sea-grant","tag-sport-fish","tag-warsaw-grouper"],"displayCategory":null,"acf":{"ncst_posts_meta_modified_date":null},"yoast_head":"\nSome Sport Fish Are Caught Repeatedly \u2013 Which Could Throw Off Population Estimates - North Carolina Sea Grant<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/ncseagrant.ncsu.edu\/some-sport-fish-are-caught-repeatedly-which-could-throw-off-population-estimates\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Some Sport Fish Are Caught Repeatedly \u2013 Which Could Throw Off Population Estimates - North Carolina Sea Grant\" \/>\n<meta property=\"og:description\" content=\"\u201cThink of it this way,\u201d says Brendan Runde, first author of the study and a Ph.D. student at NC\u00a0State. \u201cLet\u2019s say you tagged 1,000 fish and recaptured 100 of them for a first time. 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