Historical and recent estimates of the body-size and abundance of pelagic species taken by longline Peter Ward RAM Myers Dalhousie University EB WP-7.

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Presentation transcript:

Historical and recent estimates of the body-size and abundance of pelagic species taken by longline Peter Ward RAM Myers Dalhousie University EB WP-7

Changes in pelagic fish communities Comparison of 1990s (Hawaii) and 1950s (POFI) longline dataComparison of 1990s (Hawaii) and 1950s (POFI) longline data Species composition Species composition Size Size Catch rates Catch rates

Change in index of mass Bigeye tuna Silky shark Yellowfin tuna Blue shark 1950s

Data Features Non-target species Non-target species Size of each fish Size of each fish Hook number Hook number Depth of each catch Depth of each catch Soak time of each catch Soak time of each catch 1950s: 1950–1958,880days survey grid 1990s: 1994–2002,505days commercial fishing

Study area Hawaii 1950s 1990s

Month 1950s1990s

1950s 1990s 02:0004:0006:0008:00 Deployment time

Soak time (hr) 1950s 1990s

Depth (m) Thermocline depth Hooks Hooks per operation Key:1950s1990s s 1990s Hook depth (m)

Depth (m) Thermocline depth Hooks Hooks per operation Key:1950s1990s s 1990s Hooks per operation

Summary Similar gear gear season season time of day time of dayDifferent area area depth range depth range soak time soak time number of hooks number of hooks

Generalized linear model: mass index = mean weight x cpue

Black marlin Albacore SwordfishYellowfinBigeye Silky shark Blue shark Oceanic whitetip Blue marlin Mako sharks Striped marlin Thresher sharks Sailfish SkipjackLancetfishes Wahoo Mahi mahi Barracudas Spearfish Pelagic ray Crocodile shark Pomfrets Large predators Small species Rare species Change in mass or cpue increasedecrease

Yellowfin tuna size 1950s s Size (kg)

1950s mean size (kg) 1990s mean size (kg) Blue marlin Mako sharks Mahi mahi Change in body size

Change in index with size 1950s mean size (kg) Change in index of mass Blue marlin Mako sharks Mahimahi

Reductions in size and cpue of large predators Reductions in size and cpue of large predators Modest change in small species Modest change in small species Appearance of several new species Appearance of several new species Reduction in index of mass Reduction in index of mass Conclusions 500