Protocol Details for Monitoring Aquatic Nuisance Species

Protocol Details for Monitoring Aquatic Nuisance Species Protocol Details for Monitoring Aquatic Nuisance Species

Fish - Round Goby
Multiple - benthic
Qualitative:	no
Quantitative:	Yes
Rapid Assessment:	No
Specs:
Distance:
Frequency:
Gear:	trawl
Method:	The primary gear used in each of the Great Lakes was a 4.9 m bottom trawl, commercially manufactured with a 3.8 cm stretch mesh body, a 31.8 mm stretch mesh cod end, and a 12.7 mm stretch mesh inner liner to hold small specimens. Bottom trawls were pulled with a variety of vessels and were deployed and retrieved either by hand or with a winch powered hydraulically, electrically, or by gasoline engine. The target time for trawl tows was 5 to 10 minutes per tow, but varied in duration depending on the size of the area trawled, the presence of submerged obstacles, and numbers of fish captured. Tow speed was maintained at approximately 3 km/hr. and was monitored by commercially manufactured trolling speed indicators or engine tachometer readings.
Comments:
Reference 1
Reference 2
Reference 3

Fish - Round Goby

Multiple - benthic

Qualitative:

Quantitative:

Yes

Rapid Assessment:

Specs:

Distance:

Frequency:

Gear:

trawl

Method:

A 4.9 m fully-rigged semi-balloon bottom otter trawl (3.81 cm stretch body and 0.84 mm cod mesh) with 38.1 x 76.2 cm otter trawl boards is the primary gear used in the survey. The trawl is generally towed for 5 minutes, although this can vary. See document for step-by-step protocol.

Comments:

Reference 1

author	U.S. Fish and Wildlife Service, Alpena FRO
Date	2004
Title	Lake Huron Invasive Species Surveillance and Nearshore Fish Community Monitoring Protocol
pages	5 pp.

Reference 2

author	U.S. Fish and Wildlife Service, Alpena FRO
Date	2004
Title	Round Goby
URL	http://midwest.fws.gov/alpena/roundgoby.htm

Reference 3

Fish - Round Goby

Multiple - benthic

Qualitative:

Quantitative:

Yes

Rapid Assessment:

Specs:

Distance:

Frequency:

Gear:

trawl

Method:

Although the 4.9 m trawl is the primary gear used in this sampling programme, alternative gears such as this one are sometimes used when the larger trawl is unfeasible.

A 3.0 m semi-balloon bottom otter trawl (3.81 cm stretch body and 0.84 mm cod mesh) with 30.2 x 60.9 cm trawl boards is an alternative gear that is smaller, yet fished in the same way as the larger gear only by hand and with rope instead of cable. It is used in shallow and smaller areas that have an even bottom, including bays and small river mouths. Effort is recorded in minutes trawl was fished and would consist of six 5-minute tows for a total of 30 minutes effort per sampling location.

Comments:

Reference 1

author	U.S. Fish and Wildlife Service, Alpena FRO
Date	2004
Title	Lake Huron Invasive Species Surveillance and Nearshore Fish Community Monitoring Protocol
pages	5 pp.

Reference 2

author	U.S. Fish and Wildlife Service, Alpena FRO
Date	2004
Title	Round Goby
URL	http://midwest.fws.gov/alpena/roundgoby.htm

Reference 3