Case Study: Blue and Mako Shark Catch Rates in US Atlantic Recreational Fisheries as Potential Indices of Abundance

Gregory Skomal; Elizabeth A Babcock; Ellen K. Pikitch

doi:10.1002/9781444302516.ch16

Case Study: Blue and Mako Shark Catch Rates in US Atlantic Recreational Fisheries as Potential Indices of Abundance

Gregory Skomal, Elizabeth A Babcock, Ellen K. Pikitch

Marine Biology and Ecology

Research output: Chapter in Book/Report/Conference proceeding › Chapter

4 Scopus citations

Abstract

Generalized linear models were used to derive indices of abundance for blue (Prionace glauca) and shortfin mako (Isurus oxyrinchus) sharks based on two components of the US Atlantic recreational fishery: (1) the private and charter boat recreational anglers covered by the Marine Recreational Fisheries Statistics Survey (MRFSS, 1981-2002) of the National Marine Fisheries Service and (2) Massachusetts shark tournaments (1991-2004). From the MRFSS data, blue shark catch per unit effort (CPUE) showed different trends for different regions, seasons, and fishing modes, implying that CPUE is not tracking blue shark abundance. Mako shark CPUE differed by mode for private versus charter boats, and showed no trend in either boat type. From the Massachusetts tournament data, blue shark CPUE showed different trends north and south of Cape Cod. Mako shark CPUE declined in the late 1990s in Massachusetts tournaments, then increased again in 2002.

Original language	English (US)
Title of host publication	Sharks of the Open Ocean: Biology, Fisheries and Conservation
Publisher	wiley
Pages	205-212
Number of pages	8
ISBN (Print)	9781444302516, 0632059958, 9780632059959
DOIs	https://doi.org/10.1002/9781444302516.ch16
State	Published - Jan 30 2009

Keywords

Angling
Blue shark
CPUE
Game fishing
Isurus oxyrinchus
Mako shark
Prionace glauca
Recreational fishing
Shark tournaments

ASJC Scopus subject areas

Engineering(all)
Agricultural and Biological Sciences(all)

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title = "Case Study: Blue and Mako Shark Catch Rates in US Atlantic Recreational Fisheries as Potential Indices of Abundance",

abstract = "Generalized linear models were used to derive indices of abundance for blue (Prionace glauca) and shortfin mako (Isurus oxyrinchus) sharks based on two components of the US Atlantic recreational fishery: (1) the private and charter boat recreational anglers covered by the Marine Recreational Fisheries Statistics Survey (MRFSS, 1981-2002) of the National Marine Fisheries Service and (2) Massachusetts shark tournaments (1991-2004). From the MRFSS data, blue shark catch per unit effort (CPUE) showed different trends for different regions, seasons, and fishing modes, implying that CPUE is not tracking blue shark abundance. Mako shark CPUE differed by mode for private versus charter boats, and showed no trend in either boat type. From the Massachusetts tournament data, blue shark CPUE showed different trends north and south of Cape Cod. Mako shark CPUE declined in the late 1990s in Massachusetts tournaments, then increased again in 2002.",

keywords = "Angling, Blue shark, CPUE, Game fishing, Isurus oxyrinchus, Mako shark, Prionace glauca, Recreational fishing, Shark tournaments",

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AU - Babcock, Elizabeth A

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N2 - Generalized linear models were used to derive indices of abundance for blue (Prionace glauca) and shortfin mako (Isurus oxyrinchus) sharks based on two components of the US Atlantic recreational fishery: (1) the private and charter boat recreational anglers covered by the Marine Recreational Fisheries Statistics Survey (MRFSS, 1981-2002) of the National Marine Fisheries Service and (2) Massachusetts shark tournaments (1991-2004). From the MRFSS data, blue shark catch per unit effort (CPUE) showed different trends for different regions, seasons, and fishing modes, implying that CPUE is not tracking blue shark abundance. Mako shark CPUE differed by mode for private versus charter boats, and showed no trend in either boat type. From the Massachusetts tournament data, blue shark CPUE showed different trends north and south of Cape Cod. Mako shark CPUE declined in the late 1990s in Massachusetts tournaments, then increased again in 2002.

AB - Generalized linear models were used to derive indices of abundance for blue (Prionace glauca) and shortfin mako (Isurus oxyrinchus) sharks based on two components of the US Atlantic recreational fishery: (1) the private and charter boat recreational anglers covered by the Marine Recreational Fisheries Statistics Survey (MRFSS, 1981-2002) of the National Marine Fisheries Service and (2) Massachusetts shark tournaments (1991-2004). From the MRFSS data, blue shark catch per unit effort (CPUE) showed different trends for different regions, seasons, and fishing modes, implying that CPUE is not tracking blue shark abundance. Mako shark CPUE differed by mode for private versus charter boats, and showed no trend in either boat type. From the Massachusetts tournament data, blue shark CPUE showed different trends north and south of Cape Cod. Mako shark CPUE declined in the late 1990s in Massachusetts tournaments, then increased again in 2002.

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