ASSESSMENT

Larval

Tributary streams and lentic areas of the Great Lakes systematically are assessed for abundance of larval sea lampreys to determine when lampricide treatments are required and effectiveness of past treatments. The surveys primarily are conducted with backpack electrofishing gear in water 1m deep or less and with deepwater electrofishing gear or granular formulation of the lampricide Bayer 73 in water deeper than 1m. The analysis estimates the number of larvae and maps their distribution in each stream in the current year, and estimates the number of transforming larvae that will leave the stream in the following year.

Streams considered candidates for lampricide treatment in 1996 were surveyed in 1995 to provide statistically reliable estimates (+/- 50% of the mean) of larval density and amounts of habitable substrates. Survey plots were randomly selected, catch of larvae was corrected for gear efficiency, and length of larvae was standardized to the end of the growing season. Estimated mean density of larvae in the survey plots was expanded by estimated total amount of substrates that was inhabited by larvae. A curve for probability of transformation derived from historical data estimated the number of larvae that will transform and leave the stream in 1996. The streams scheduled for treatment in 1996 are ranked on an estimated cost per kill of transformer.

Lake Superior Larval Assessment

Larval surveys were conducted in 82 tributaries (52 U.S., 30 Canada; Table 8).
The sea lamprey population in the Two Hearted River was estimated at 259,410 larvae (95% confidence intervals; 78,727, 493,976). The estimated amount of substrates (m2) was type I (preferred) 212,587, type II (acceptable though not preferred) 690,908, and type III (uninhabitable) 35,431. The successful work on the Two Hearted River concludes (1988-95) during the year of and just prior to lampricide treatments (Table 9-- WARNING: Large File).
Electrofishing and Bayer 73 surveys in 1994 & 95 predicted 2,000 - 8,000 metamorphosing sea lampreys from the Michipicoten River and 1,400 - 11,800 from the Goulais River in 1995. Sampling during the lampricide treatments failed to find evidence of metamorphosing sea lamprey in the Michipicoten River and estimated 24,300 in the Goulais River.
Summer and fall assessment of the larval population up and downstream of the experimental velocity barrier on the McIntyre River confirmed that successful spawning had occured upstream of the structure in 1994. No larvae of the 1995 year class were found upstream but a low density population was found downstream. The changed stream hydraulics have apparently uncovered some suitable spawning gravel immediately below the barrier.
Extensive survey effort up and downstream of the experimental inflatable crest barrier on the Big Carp River found a single sea lamprey larva of the 1995 year class upstream of the barrier. No larvae of the 1995 year class were found downstream of the barrier.
With the granular formulation of Bayer 73 available for survey again, several lentic populations were assessed in 1996. We observed high densities of larvae in Batchawana, MacKenzie and Mountain Bays and in Lake Helen in the Nipigon River system.


Table 8.  Status of Lake Superior tributaries that have been treated for sea lamprey larvae, 1986-95.

Stream				Last		Last			Residuals		Oldest			Larval			Transformer
				Treated		Surveyed		Found			Reestablished		Estimate		Estimate
														Year Class		In 1995			for 1996

UNITED STATES

Waiska R.		May-88		1995		No		1993
Pendills Cr.		Sep-88		1995		No		1992
Galloway Cr.		Jun-92		1995		No		1993
Tahquamenon R.		Jul-90		1995		No		1991
Betsy R.		Aug-94		1995		Yes		1995
L. Two Hearted R.	Jul-91		1995		No		1992
Big Two Hearted R.	Oct-95		(1)
Sucker R. 		Jul-94		1995		Yes		1994
Sable Cr.		Sep-89		1995		No		1990
Sullivans Cr.		Jul-87		1995		No		1991
Beaver Lake Outlet	Sep-87		1995		No		1990
Miners R.		Aug-92		1995		No		1993
Furnace Cr. 		Aug-92		1995		No		1994
Au Train R.		Jul-90		1995		No		1991	 	77,714		3,817
Rock R.			Jul-90		1994		No		1994
Chocolay R.		Aug-94		1995		Yes		1994
Carp R.			Jul-88		1995		No		1991		4,481		116
Harlow Creek		Oct-92		1995		No		1993
Little Garlic R.	Oct-89		1995		No		1990		6,196		375
Big Garlic R.		Jul-93		1995		No		1993		16,553		0
Iron R.			Jun-91		1995		Yes		1991		17,658		509
Salmon Trout R.		Jun-95		(1)
Pine R.			Oct-87		1995		No		1993
Huron R.		Sep-94		(1)
Ravine R.		Aug-87		1994		No		1993
Silver R.		Sep-93		1995		Yes		1994
Falls R.		Aug-95		(1)
Sturgeon R.		Oct-94		(1)
Traverse R.		Aug-94		1995		Yes		1994
Salmon Trout R.		Aug-92		1995		No		1992		6,428		0
Misery R.		Sep-93		1995		No		1994
East Sleeping R.	Jun-95		(1)
Firesteel R.		Oct-92		1995		Yes		1993		105,359		2,912
Ontonagon R.		Sep-92		1995		Yes		1993		250,164		13,061
Potato R.		Jun-90		1995		No		1993		15,808		16
Cranberry R.		Jun-90		1995		No		1993		98,218		311
Bad R.			Sep-95		(1)
Red Cliff Cr.		Jun-94		1995		No		None
Sand R.			Oct-91		1995		No		None
Brule R.		Aug-92		1995		No		1992		19,763		80
Middle R.		Sep-94		1994		No		None
Amnicon R.		Oct-94		1994		No		None
Nemadji R. (Black R.)	Aug-93		1995		No		1993
St. Louis R.		Sep-87		1993		No		1988

Stream				Last		Last			Residuals		Oldest			Larval			Transformer
				Treated		Surveyed		Found			Reestablished		Estimate		Estimate
														Year Class		In 1995			for 1996
CANADA

West Davignon Cr.	May-89		1995		No		None		0			0
Little Carp R.		Jun-93		1995		No		1994		400			0
Big Carp R.		Jun-93		1995		No		1993		2,300			0
Cranberry Cr.		Jun-90		1994		No		None		0			0
Goulais R.		Aug-95		(1)
Haviland Cr.		none (2)	1994						300			10
Harmony R.		Jun-90		1995		Yes		None		0			0
Chippewa R.		Aug-90		1995		No		1991		6,800			0
Batchawana R.		Jul-94		1995		Yes		1994		56,200			0
Carp R.			Jun-94		1995		No		None		0			0
Pancake R.		Jul-93		1995		No		1993		20,681			0
Westman's Cr.		none (2)	1995		-		-		100			0
Agawa R.		Aug-84		1995		Yes		1985		26,600			190
Gargantua R.		Jun-95		(1)
Michipicoten R	.	Aug-95		(1)
White R.		Sep-88		1995		No		1993		2,100			0
Pic R.			Aug-90		1995		No		1991		488,300			1,180
Little Pic R.		Sep-94		(1)
Prairie R.		Jul-94		1995		No		None		0			0
Steel R.		Jul-89		1995		No		1989		2,100			320
Pays Plat R.		Aug-93		1995		Yes		1993		70,300			0
Gravel R.		Jul-94		1995		Yes		1994		42,100			20
Little Gravel R.	Jul-95		1995		No		None
Cypress R.		Jul-94		1995		Yes		1994		25,300			0
Jackpine R.		none (2)	1994
Jackfish R.		Jul-92		1995		No		1992		86,200			300
Upper Nipigon R.	Aug-92		1995		Yes		1992		287,800			280
Lower Nipigon R.	Jul-83		1995		Yes		pre 1990	146,700			1,200
Cash Cr.		Jul-91		1995		No		1991		38,300			150
Polly Cr.		Jul-87		1994		Yes		1989
Stillwater Cr.		Jul-91		1995		No		1991		10,500			40
Black Sturgeon R.	Jul-95		(1)
Wolf R.			Jul-94		1995		Yes		1994		15,200			0
Pearl R.		Jul-91		1995		No		1991		5,700			0
MacKenzie R.		Sep-78		1994		No		pre 1990
Current R. 		none (2)	1994
Neebing-McIntrye
Floodway		Jul-94		1995		Yes		1994		26,300			40
Kaministiquia R.	Aug-92		1995		Yes		1992		199,000			590
Cloud R.		Jul-94		1995		No		None
Pine R.			Jul-73		1994		No		pre 1990	low			0
Pigeon R.		Jul-94		1995		Yes		None		3,500			140

1Not surveyed since last lampricide treatment.
2 Ma y have an associated lentic population.

Lake Michigan Larval Assessment

Surveys were conducted in 91 tributaries of Lake Michigan (Table 10).
Young-of-the-year recruitment was detected in 25 of 53 examined streams.
Sea lampreys reestablished larval populations in 48 streams.

Table 10.  Status of Lake Michigan tributaries that have been treated for sea lamprey larvae, 1986-95



Stream				Last		Last			Residuals		Oldest			Larval			Transformer
				Treated		Surveyed		Found			Reestablished		Estimate		Estimate
														Year Class		In 1995			for 1996

Brevort R.		May 89		1995		No		1991
Paquin Cr.		Oct 87		1995		No		1989
Hog Island Cr.		Jun 92		1995		Yes		1992		3,436			195
Black R.		Jun 91		1995		Yes		1991		524,392			266
Millecoquins R.		Jun 95		1995		 		(1)
Rock R.			Jun 95		1995			  	(1)
Crow R.			May 86		1995		No		None
Hudson Cr.		May 90		1995		No		1990		4,578			8
Swan Cr.		Jul 92		1993		No		None
Milakokia R.		Jun 94		1995		Yes		1994
Gulliver Lake Outlet	Aug 88		1995		No		1994
Marblehead Cr.		Aug 88		1995		No		1992		10,579			107
Manistique R. 		Aug 89		1995		No		1992
Deadhorse Cr.		May 91		1995		No		1992		26,595			20
Parent Cr.		Jun 91		1995		No		1994
Poodle Pete Cr.		Jun 91		1995		No		1991
Valentine Cr.		May 91		1995		No		1991		3,064			7
L. Fishdam R.		Jul 92		1995		Yes		1993
Big Fishdam R.		May 95		1995		No		(1)
Sturgeon R.		May 94		1995		Yes		1994
Ogontz R.		Jun 92		1995		Yes		1992		20,397			146
Whitefish R.		Aug 95		1995				(1)
Rapid R.		Jun 95		1995				(1)
Tacoosh R.		May 92		1995		No		1993		17,163			150
Days R.			Jun 94		1995		No		1994
Ford R.			Apr 93		1995		Yes		1993		1,181,683		36,399
Bark R.			Oct 92		1995		No		None
Cedar R.		Sep 93		1995		Yes		1994
Bailey Cr.		Sep 93		1995		Yes		1994
Beattie Cr.		Jun 88		1995		No		1993
Peshtigo R.		Jun 91		1995		No		1991		10,947			305
Oconto R.		May 87		1995		No		1994
Hibbards Cr.		May 95		1995		Yes		None
Whitefish Bay Cr.	May 87		1994		No		None
East Twin R.		May 95		1994		  		(1)
Fischer Cr.		May 87		1995		No		None
Carp Lake R.		Sep 94		1994		Yes		(1)
Big Sucker Cr.		May 89		1994		No		1989
Wycamp Lake Outlet	Sep 88		1994		No		1993
Horton Cr.		Sep 93		1995		Yes		1994
Boyne R.		Aug 91		1995		No		1992
Porter Cr.		Aug 94		1995		No		1995
Jordan R.		Aug 92		1995		Yes		1993
Elk Lake Outlet		Aug 88		1995		No		1989
Mitchell Cr.		Jun 94		1995		No		1994
Boardman R.
Hospital Cr.		Jun 91		1995		Yes		1991		81,082			4,221
  Lower			Jul 91		1995		Yes		1991
  Upper			Aug 87		1994		No		None
Platte R.		Jun 92		1995		No		1992		1,347,167		7,212
Betsie R.		Jun 95		1995		No		1995
Big Manistee R.		Jul 94		1995		Yes		1994
  L. Manistee R.	Jul 94		1995		Yes		1994
Gurney Cr.		Sep 93		1994		Yes		None
Lincoln R.		Jun 94		1995		Yes		1994
Pere Marquette R.	Aug 95		1995		Yes		None
Pentwater R.		Jul 92		1995		No		1993		34,051			34
Stoney Cr.		Jul 87		1995		No		None
White R.		Aug 95		1995		Yes		None
Muskegon R.		Sep 92		1995		No		1993		6,078,224		235,835
  Sand Cr.		May 95		1995		No		None
  Minnie Cr.		May 95		1995		No		None
  Bigelow Cr.		May 95		1995		No		None
Grand R.
  Crockery Cr.		Sep 91		1995		No		1992
  Norris Cr.		Jun 87		1995		No		None
Kalamazoo R.
  Bear Cr.		May 92		1995		No		None
  Sand Cr.		May 92		1995		No		None
  Mann Cr.		Jun 88		1995		No		1992
Black R.		Sep 93		1995		Yes		1994
Brandywine Cr.		Jun 85		1995		No		1994
St. Joseph R.
  Paw Paw R.		Sep 92		1995		No		1993
  Pipestone Cr.		Jul 88		1995		No		None
  Blue Cr.		Jul 88		1995		No		1991
Galien R.		Jun 93		1995		No		1993
Trail Cr.		May 92		1995		Yes		None
State Cr.		May 86		1995		No		None
Burns Ditch		Jun 93		1995		Yes		None

1Not surveyed since last lampricide treatment.

Lake Huron Larval Assessment

Larval surveys were conducted in 60 tributaries (31 U.S., 29 Canada; Table 11).
Assessment surveys in 1994 & 95 predicted 1,000 - 9,300 metamorphosing sea lampreys from the Root River and 200 - 24,700 from the Mississagi River in 1995.
Sampling of the larval populations during the lampricide applications estimated a metamorphosing population of 1,100 in 8.5 km of the Root River and 200 in the Mississagi River.
Hand scap net collections during the lampricide application of the Mississagi River collected almost 100 metamorphosing sea lampreys and the population estimate of 200 appears to be significantly under estimated.
The St. Marys River Control Task Force report (pp 45 to 51) includes an update on the binational effort to map distribution and density of the larval population contained in that river.
Quantitative assessment of the Byng Inlet (Magnetewan River) population yielded an estimate of 126,000 larvae and a potential for about 300 transformers in 1996.


Table 11.  Status of Lake Huron tributaries that have been treated for sea lamprey larvae, 1986-95.

Stream				Last		Last			Residuals		Oldest			Larval			Transformer
				Treated		Surveyed		Found			Reestablished		Estimate		Estimate
														Year Class		In 1995			for 1996

UNITED STATES

L. Munuscong R.		May 95		(1)
Munuscong R		May 86		1995		No		1992		12,041			821
Carlton Cr.		May 86		1993		No		1988
Caribou Cr.		May 91		1994		No		None
Albany Cr.		May 94		1994		Yes		None
Trout Cr.		May 94		1995		Yes		None
Beavertail Cr.		May 91		1995		Yes		1992		9,319			202
Prentiss Cr.		Oct 93		1995		Yes		None
McKay Cr.		May 95		(1)
Ceville Cr.		May 94		1995		No		None
Hessel Cr.		May 91		1995		No		None
Nuns Cr.		Oct 88		1995		No		1993		4,378			805
Pine R.			Jun 93		1995		Yes		1993
Carp R.			May 93		1995		Yes		1993		698,835			12,791
Martineau Cr.		Oct 93		1993		No		None
Cheboygan R.
   Maple R.		Aug 92		1995		No		1993
   Pigeon R.		Aug 93		1995		Yes		1994
   Sturgeon R.		Aug 94		1995		No		1995
   Laperell Cr.		May 89		1994		No		1993
   Meyers Cr.		May 89		1994		No		1993
   L. Pigeon R.		Oct 88		1994		No		None
Elliot Cr.		Jul 92		1995		Yes		1992	 	27,498			730
Greene Cr.		May 92		1995		Yes	  	1992	 	13,932	   		545
Mulligan Cr.		May 94		1995		Yes	 	None
Black Mallard Cr.	May 92		1995		Yes	 	1992	 	46,952			5,368
Ocqueoc R.
   Lower only		Aug 93		1995		Yes	  	1994
   Upper only		Sep 94		1995		Yes	 	None
Schmidt Cr.		Aug 93		1994		Yes	  	1994
Trout R.		Jun 93		1995		Yes	 	1993
Devils R.		May 95		(1)
Black R.		May 94		1995		Yes	  	1994
Au Sable R.		Jun 95		1995		Yes	  	1995
Pine R.			Jun 87		1995		No	  	None
Tawas R.
   Silver Cr.		Jun 92		1995		No	 	 1992
   Cold Cr.		Jun 92		1995		No	  	1992		464,301			14,148
East Au Gres R.		May 93		1995		No	  	1993
Au Gres R.		May 93		1995		No	 	 1993		14.698
Rifle R.		Jul 93		1995		Yes	  	1993
Saginaw R.
   Shiawassee R.	Oct 87		1995		No	 	 1988
   Chippewa R.		Sep 95		1995		No	 	 None
   Pine R.		Oct 88		1995		No	 	 1989
   Big Salt Cr.		Oct 88		1995	  	No	   	1988		26,568			312
   Carroll Cr.		Oct 88		1995	   	No	   	1990
   Big Salt R.		May 93		1995	   	No	   	1993
Pine R.			Apr 88		1994	   	No	   	None


Stream				Last		Last			Residuals		Oldest			Larval			Transformer
				Treated		Surveyed		Found			Reestablished		Estimate		Estimate
														Year Class		In 1995			for 1996

CANADA

St. Marys R.		none		1995		pre 1990			3,400,000
Root R.			Sep-95		(1)
Garden R.		Jul-94		1995		No		1994		280,700			0
Echo R. 		Jul-94		1995		Yes		1994		13,400			0
Sucker Cr.		Jul-95		(1)
Twotree R.		May-90		1995		No		1993		1,200			0
Richardson Cr.		Jun-89		1995		No		1990		1,600			290
Watson Cr.		Jun-94		1994		No		none		0			0
Gordon Cr.		Jun-92		1995		Yes		1992		12,300			1,200
Brown's Cr.		Sep-92		1995		No		1993		17,200			0
Koshkawong R.		Jul-93		1995		No		1993		1,900			0
Unnamed (H-68) (2)	Sep-75		1995		No		pre 1990
Thessalon R.(upper)	Sep-91		1995		Yes		1992		148,900			12
Thessalon R.(lower)	Jun-92		1995		Yes		1992		129,600			63
Livingstone Cr.		Aug-94		1995		No		none		0			0
Mississagi R.		Aug-95		(1)
Blind R.		May-84		1995		No		pre 1990	100			0
Lauzon R.		Jul-93		1995		Yes		1993		200			10
Spragge Cr.		Oct-95		(1)		none
Serpent R. (main)	Jul-93		1995		No		none		0			0
Serpent R. (Grassy Cr.)	Jul-93		1995		Yes		1993		2,600			220
Spanish R.		Aug-94		1995		Yes		1994		62,161			630
Kagawong R.		Aug-67		1991		No		pre 1990
Silver Cr.		May-94		1994		No		none		0			0
Sand Cr.		Oct-94		(1)
Mindemoya R.		Jun-93		1995		Yes		1993		97,000			0
Timber Bay Cr.		Jun-93		1995		Yes		1993		23,700			0
Manitou R.		May-94		1995		No		1994		400			0
Blue Jay Cr.		May-94		1995		Yes		none		0			0
Chikanishing R.		Jun-95		(1)
French R. (main)	none		1992		pre 1990
French R. (Wanapitei).	Aug-94		1995		No		none		0			0
French R. (West Chan)	Jun-92		1995		No		1992		3,800			30
Still  R.		Jun-88		1995		No		1989		23,600			900
Magnetawan R.		Jul-93		1995		Yes		1993		76,600			280
Naiscoot R.		Jun-93		1995		No		1993		70,200			0
Shebeshekong R (.)2	none		1993		pre 1990
Boyne R.		Jun-95		(1)
Musquash R.		Aug-88		1995		No		1989		62,000			920
Coldwater R. (2)	none		1994
Sturgeon R.		Jun-95		(1)
Nottawasaga R.		Jun-93		1995		Yes		1993		1,851,900		2,400
Beaver R. (2)		none		1995
Sauble R.		Jun-85		1995		No		pre 1990	21,900			2,940
Saugeen R.		Jun-71		1995		No		pre 1990	8,800			100

1 Not surveyed since last lampricide treatment.
2May have an associated lentic population.

Lake Erie Larval Assessment

Larval surveys were conducted in 24 tributaries (14 U.S., 10 Canada; Table 12).
Sea lamprey populations exist in 6 streams out of 18 that have had a known population of sea lampreys.

Table 12.  Status of Lake Erie tributaries that have been treated for sea lamprey larvae, 1986-95.

Stream				Last		Last			Residuals		Oldest			Larval			Transformer
				Treated		Surveyed		Found			Reestablished		Estimate		Estimate
														Year Class		In 1995			for 1996
UNITED STATES

Delaware Cr.		Oct-86		1995		No		None
Cattaraugus Cr.		Oct-94		1995		Yes		1995
Halfway Br.		Oct-86		1994		No		None
Canadaway Cr.		Oct-86		1994		No		None
Crooked Cr.		Oct-90		1995		No		1991
Raccoon Cr.		Oct-90		1994		No		1991
Conneaut Cr.		Oct-95		1995		No		None
Grand R.		Apr-87		1995		No		1991

CANADA

East Cr.		Jun-87		1995		No		None
Catfish Cr.		Jun-87		1995		No		None
Big Otter Cr.		May-91		1995		No		None
South Otter Cr.		Oct-86		1995		No		None
Clear Cr.		May-91		1995		No		None
Big Cr.			May-92		1995		No		1992		42,230			9,916
Forestville Cr.		May-89		1995		No		None
Normandale Cr.		May-87		1995		No		None
Fishers Cr.		Jun-87		1995		No		1994		54			0
Young's Cr.		May-91		1995		No		None

Lake Ontario Larval Assessment

Larval surveys were conducted in 37 tributaries (23 U.S., 14 Canada; Table 13).
Intensive larval population and habitat assessments were conducted on two tributaries: the Credit River and South Sandy Creek. Estimates of larval and 1996 transformer production were 43,487/25,212 for the Credit, and 64,157/1,223 for South Sandy.
Transformer populations were estimated on 6 Canadian and 4 U.S. tributaries in 1996 using the index protocol.
Routine assessment work to determine larval presence/absence and distribution was conducted on 7 Canadian and 19 U.S. tributaries.


Table 13.  Status of Lake Ontario tributaries that have been treated for sea lamprey larvae, 1986-95

Stream				Last		Last			Residuals		Oldest			Larval			Transformer
				Treated		Surveyed		Found			Reestablished		Estimate		Estimate
														Year Class		In 1995			for 1996
UNITED STATES

Black R.		Jun-91		1995		No		1995
Stony Cr.		Sept-82		1995		No		None
South Sandy Cr.		May-93		1995		No		1993		64,157 			1,223
Skinner Cr.		May-93		1995		No		1995
Lindsey Cr.		May-94		1995		Yes		1994		22,945 			1,032
Blind Cr.		May-76		1995		No		None
Little Sandy Cr.		May-95		1995		No		1995
Deer Cr.		May-95		1995
Salmon R.		May-95		1995		Yes		1995
Grindstone Cr.		Apr-94		1995		Yes		1994
Snake Cr.		May-95		1995
Sage Cr.		Apr-78		1995		No		None
Little Salmon R.	May-94		1995		Yes		1994
Butterfly Cr.		May-72		1995		No		None
Catfish Cr.		May-93		1995		No		1993		2,314 			126
Oswego R. System
   Black Cr.		May-81		1995		No		None
   Big Bay Cr.		Sep-93		1995		No		None
   Scriba Cr.		May-84		1995		No		None
   Fish Cr.		June-95		1995		Yes		1995
   Carpenters Br.	May-94		1994		No		None
   Hall Br.		Never		1995		No		None
   Cold Spring Br.	Never		1995		No		None
   Crane Br.		Never		1995		No		None
   Putnam Br.		Never		1995		No		1990		5,991 			1,353
   Scaneateles Cr.	Never		1995		No		None
Rice Cr.		May-72		1992		No		None
Nine Mile Cr.		May-95		1995
Sterling Cr.		May-94		1995		No		1994
Blind Sodus Cr.		May-78		1995		No		None
Red Cr.			Apr-94		1994		No		None
Wolcott Cr.		May-79		1993		No		None
Sodus Cr.		May-95		1995		No		None
Third Cr.		Aug-72		1995		No		None
First Cr.		May-95		1995
Salmon Cr.		May-93		1995		No		1993		16,764 			652
Oak Orchard Cr.	May-/88	1994		No		None

Stream				Last		Last			Residuals		Oldest			Larval			Transformer
				Treated		Surveyed		Found			Reestablished		Estimate		Estimate
														Year Class		In 1995			for 1996
CANADA

Ancaster Cr.		Apr-77		1994		No		1990
Bronte Cr.		Jun-95		1995		No		1995
Sixteen Mile Cr.	Jun-82		1994		No		pre - 1990
Credit R.		May-91		1995		Yes		1991		43,487			25,212
Rouge R.		May-94		1995		No		none
Duffins Cr.		Jun-93		1995		No		1993		1,441			112
CarruthersCr.		Sep-76		1992		No		none
Lynde Cr.		Sep-95		1995
Oshawa Cr.		Apr-93		1995		Yes		1993		50,911			7,860
Farewell Cr.		Sep-95		1994
Bowmanville Cr.		Jun-95		1995		No		1995
Wilmot Cr.		Apr-93		1995		Yes		1993		42,701			2,127
Graham Cr.		May-86		1995		No		1993		6,362			792
Port Britain Cr.	 May-91		1995		No		1991		2,413			1,150
Gage Cr.		May-71		1989		No		none
Cobourg Cr.		Aug-92		1995		No		1992		10,737			801
Covert Cr.		Apr-94		1994		No		none
Grafton Cr.		May-88		1995		No		1994
Shelter Valley Br.	Sep-86		1995		Yes		1992		13,397			4,296
Colborne Cr.		Jun-95		1994
Salem Cr.		Sep-94		1994		No		1995
Proctors Cr.		Jun-95		1995
Smithfield Cr.		Sep-86		1994		No		none
Mayhew Cr.		Aug-92		1995		No		1993		1,896			25
Salmon R.		Jun-94		1994		No		none

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ASSESSMENT

Larval

Lake Superior Larval Assessment

Stream Last Last Residuals Oldest Larval Transformer Treated Surveyed Found Reestablished Estimate Estimate Year Class In 1995 for 1996

Stream Last Last Residuals Oldest Larval Transformer Treated Surveyed Found Reestablished Estimate Estimate Year Class In 1995 for 1996

Lake Michigan Larval Assessment

Stream Last Last Residuals Oldest Larval Transformer Treated Surveyed Found Reestablished Estimate Estimate Year Class In 1995 for 1996

Lake Huron Larval Assessment

Stream Last Last Residuals Oldest Larval Transformer Treated Surveyed Found Reestablished Estimate Estimate Year Class In 1995 for 1996

Stream Last Last Residuals Oldest Larval Transformer Treated Surveyed Found Reestablished Estimate Estimate Year Class In 1995 for 1996

Lake Erie Larval Assessment

Stream Last Last Residuals Oldest Larval Transformer Treated Surveyed Found Reestablished Estimate Estimate Year Class In 1995 for 1996

Lake Ontario Larval Assessment

Stream Last Last Residuals Oldest Larval Transformer Treated Surveyed Found Reestablished Estimate Estimate Year Class In 1995 for 1996

Stream Last Last Residuals Oldest Larval Transformer Treated Surveyed Found Reestablished Estimate Estimate Year Class In 1995 for 1996