I/OJ C- # 4JLD • 3Wi-ODO

LAKE SURVEYS:

NANAIMO RIVER WATERSHED

JULY 1980

B. Blackman

Nanaimo River

Salmonid Enhancement Project

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- 1 -

INTRODUCTION

The purpose of the lake survey program in the Nanaimo River watershed

was to gather baseline data on:

1. biophysical features of the lakes

2. water quality

3. fish utilization and species and diseases present

4. to find a suitable lake pen rearing site

MATERIALS AND METHODS

Lake surveys were carried out on nineteen lakes within the Nanaimo

River watershed (Fig. 1). These lakes included:

1. Barsby Lake

2. Beck Lake

3. Blackjack Lake

4. Blind Lake

5. Cassidy Gravel Pit

6. Crystal Lake

7. First Lake

8. Fourth Lake

9. Green Mountain (or Heart) Lake

10. Healy (or Panther) Lake

11. Holden Lake

12. McKay Lake

13. Myles Lake

14. Quennel Lake

15. Second Lake

16. Shelton Lake

17. Third Lake

18. Timberlands Lake

19. Williams Lake

In most cases, the write up for each lake contains a physical description

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- 2 -

a contour map with vegetation noted, water quality data and gill net data.

PHYSICAL DESCRIPTION

The physical description of the lake contains the following information

and the method by which it was determined.

NAME: Name of the lake.

DATE: Date of the survey.

LOCATION: NTS map number, latitude and longitude and the UTM number.

ACCESS: Recorded by the S.E.P. field technicians. All directions start

from Nanaimo.

PHYSICAL DATA: Surface Area - Calculated from the survey map using a

polar planimeter.

Perimeter - Calculated in metres using a map measurer.

Volume - Calculated in cubic metres using the following

formula:

VoW =[i A.+1(D.+1 -D.) +H(A± -A.+1) (Di+1 -D.)] +̂ (D^ -Dfe)Where A = the area of the contour line

D = the depth at the contour interval

k = the number of contour lines

For example:

Volume = 90(3 - 0) + *5(100 - 90) (3 - 0) + 80(6 - 3) + ^(90

70(9 - 6) + *2(80 - 70) (9 - 6) + h x 70(10.4 - 9)

- 80) (6 - 3) +

-. 3 - ' • "

Elevation - In metres, determined from the NTS map.-

Maximum Depth - In metres, determined by the field technicians

using a hand line.

Mean Depth - Calculated in metres using the formula;

Mean Depth = Volume (ra3)Surface Area (m2)

DRAINAGE: Taken from the Fish and Wildlife Branch maps or from the NTS maps.

PHYSICAL CHARACTERISTICS: Noted by the S.E.P. field technicians.

VEGETATION: Noted by the S.E.P. field technicians.

BENCHMARK: Noted and placed by the S.E.P. field technicians.

PUBLIC UTILIZATION: Noted by the S.E.P. field technicians.

COMMENTS: Noted by the S.E.P. field technicians.

CONTOUR MAP

The contour maps of the lakes were either taken from the Nanaimo

Fish and Wildlife Branch or were drawn from data gathered using a handline. The vegetation marked on the contour maps was identified and notedby the S.E.P. field technicians.

WATER QUALITY DATA

The water quality was determined by the S.E.P. field technicians.

The tests and equipment included:

SECCHI DEPTH: The depth of light penetretion in metres using a secchi disc.

WATER TEMPERATURE: Taken at one metre depth intervals using a max/rain

thermometer or- a Yellow Springs- Instrument - model

33 S.C.T. metre.

DISSOLVED OXYGEN (mg/1), ALKALINITY (gr/gal) and pH: Standard Hach testswere carried out at a minimum of 2 depths. Carbon dioxide (mg/1) andhardness tests were also carried out on occasion.

_ A -

CONDUCTIVITY (umbos) - Tests were carried out at each of the test depths

using the Yellow Springs Instrument - model 33 S.C.T.

meter. If the instrument was unavailable, a % litre

water sample from each depth was taken back to the

office for testing.

GILL NET DATA: Gill netting was carried out in only 9 of the 19 lakes. The

nets used were sinking monofilament, 50 x 6 ft., 1/2, 3/4,

1, 11/2, 2, 21/2 and 3 inch mesh. All fish caught were taken

to the Pacific Biological Station to be tested for diseases

and parasites.

RESULTS

Disease and parasite analysis on gill net caught fish were completed at

the Pacific Biological Station in Nanaimo. The results were:

/. Parasites:

Digenea: Crepidostomum farionis

Tetracotyle sp.

Cestoda: Diphyllobothrium sp.

Proteocephalus sp.

Acanthocephala: Neoechinorhynchus sp.

Nematoda: R.habdochona sp.

Sterliadochona tenuissima

Trematoda: Neascus sp.

Protozoa: Myxobotus neurobius

Parasites were found in normal numbers for wild stocks - specific

cases were not given.

Diseases:

The only disease found in the gill netted fish was furunculosis. There

(War were 2 cases of the disease, one chinook smolt and one spawned out adult

chinook.

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- :> -

NANAIMO RIVER WATERSHED

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Fig. 1 - Lakes within the

Nanaimo River Watershed.

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LAKE SURVEY MAP LEGEND

SYMBOLS

^-"~>. Road

>"1, ** Railway

Power Transmission Line

^ .'x Bridge

O Building

•* Stream Flow Direction

"^-Ai-rHSontour Line

vP Water Chemistry Station

© Benchmark

*• * * Gill Net

—> Flat Shoreline

1 > Moderate Shoreline

-*-*-> Steep Shoreline - 30°+

a\\> Very Steep Shoreline - A5°+

/"X Beaver House

^ Beaver Dam

""/ V Picnic Site

/N Campsite

VEGETATION

I> Alder

C- Cedar

^ Douglas Fir

H Hemlock

? Pine

S> Sitka Spruce

W Willow

-3«& Swamp

CT Cattails

L-l— Leather Leaf

LP Lily Pads

^STT Detritus

- 33 -

LAKE SURVEY

NAME: First Lake

DATE: May 10, 1979

LOCATION: NTS // 92F/1 Lat., Long. 49° 06', 124° 10' UTM // 150 385

ACCESS: -turn right onto Nanaimo River Road from Island Highway

-go 20.8 km and turn left at campsite sign. There is a boat

launching ramp at the campsite (200 m east of Crown Zellerbach

office).

PHYSICAL DATA: Surface Area -1,960,000 m2 ffr^* ^^^^Lj X jL^

DRAINAGE:

Perimeter - 8900 m

Volume - 8,049,000 m3

Elevation - 193 m

Maximum Depth - 19.2 m

Mean Depth -4.1m

Main inlet and outlet is the Nanaimo River.

^T-

VEGETATION: The lake is surrounded by fir, cedar, alder, willow and some

pine. Along the shoreline there is some leather leaf, lily pads,

sedges and bulrushes.

BENCHMARK: 1 m above water line on piling on north side of lake.

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