Derelict Fishing Gear & Related Debris: Derelict Fishing Gear - PowerPoint PPT Presentation

Derelict Fishing Gear & Related Debris: Derelict Fishing Gear & Related Debris: A Hawaii Case Study A Hawaii Case Study 1 & Gregory Schorr 2 Mary J. Donohue 1 & Gregory Schorr 2 Mary J. Donohue 1 University of Hawaii Sea Grant College Program 1 University of Hawaii Sea Grant College Program 2 NOAA Fisheries Pacific Islands Science Center 2 NOAA Fisheries Pacific Islands Science Center

U.S. Pacific Islands U.S. Pacific Islands

Percentages of U.S. Coral Percentages of U.S. Coral Reefs by Area Reefs by Area US Virgin Islands US Virgin Islands Florida 2% Florida 2% 1% 1% Puerto Rico 3% Puerto Rico 3% Main Hawaiian Main Hawaiian American Samoa 2% American Samoa 2% Islands Islands Other Pac. Islands 4% Other Pac. Islands 4% 15% 15% Guam 1% Guam 1% N. Mariana Islands N. Mariana Islands 3% 3% Northwestern Northwestern Hawaiian Islands Hawaiian Islands 69% 69% (Miller and Crosby, 1998) (Miller and Crosby, 1998)

Northwestern Hawaiian Northwestern Hawaiian Islands Islands • ~70% of all U.S. coral reefs by area • ~1500 km 2 of reef <10 m deep • Protected species habitat � Hawaiian monk seal � Sea turtles • Subject to debris set adrift throughout the N. Pacific Ocean

Net Samples Analyzed from Net Samples Analyzed from NWHI 1998- -2002 2002 NWHI 1998 N = 3979 Trawl 2.3% Other 2.9% Misc. Line .95% Trawl/Seine 83.6% Monofilament Gillnet 5.2% Multifilament Gillnet 3.2% Longline 1.4% (Timmers and Donohue, 2003) (Timmers and Donohue, 2003)

Litter Accumulation by Litter Accumulation by Currents Currents 50° * * * * * * * * 40° 30° 20° 10° 0° 120° 140° 160° 180° 200° 220° 240° 50° 40° ** ** 30° * * * * 20° 10° (Kubota 1994) (Kubota 1994) 0° 120° 140° 160° 180° 200° 220° 240°

Oceanography Oceanography

Impacts of Impacts of Derelict Fishing Gear Derelict Fishing Gear Economic Impacts: Economic Impacts: � Crew/passenger safety � Crew/passenger safety � Ship (propeller/intake) damage � Ship (propeller/intake) damage � Ghost fishing � Ghost fishing

Impacts of Impacts of Derelict Fishing Gear Derelict Fishing Gear Ecological Impacts: Ecological Impacts: � Wildlife entanglement & � Wildlife entanglement & ingestion ingestion � Coral damage � Coral damage � Substrate disturbance � Substrate disturbance � Alien species introduction � Alien species introduction

Ecological Impacts Ecological Impacts Wildlife Entanglement Wildlife Entanglement

Coral/Substrate Damage Coral/Substrate Damage Substrate Damage Substrate Damage Coral Damage Coral Damage

Introduction of Alien Species Introduction of Alien Species Invasive Invasive Sea Anemone Sea Anemone found on net at found on net at Pearl & Pearl & Hermes Atoll, Hermes Atoll, 2000 2000 Diadumene lineata Diadumene lineata (Zabin ( Zabin and Godwin, 2003) and Godwin, 2003)

Northwestern Hawaiian Islands Northwestern Hawaiian Islands Multi- -Agency Marine Debris Cleanup Agency Marine Debris Cleanup Multi 1998- -2003 2003 1998