Fish Diversity and Diet in Lake Erken and Falken

Created by

Ronalds Aumeisters and Elvijs Berkolds

Introduction

There are many kinds of fish species in SwedishLakes.We wanted to make this research to see howmuch of different fish species we will catch in thetwo lakes- Lake Erken and Lake Falken.

Hypotheses

• There will be 2 dominant species (Perch, Roach).

• We will find a larger variety of fish species in shallow areas than the deeper ones.

• The fish will be bigger in deeper areas.• The fish diet is more varied in shallow areas

than in deep areas.

Materials & Methods

• Putting out nets• Picking up nets• Identifying fish• Identifying fish diet

Field Work

Field work equipment• Fish nets • Floats• Life west • Rowing boat• Notebook • GPS device• Eco Sounder

Laboratory Work

Laboratory work equipment• Scale • Measure • Microscope • Scope• Dissection instruments (scalpel, scissors) • Notebook + pencil

ResultsCaught fishes in Lake

ErkenPerch 18

Roach 26

Bream 6

Rudd 9

Burbot 1

Caught fishes in Lake Falken

Perch 17

Roach 28

Bream 2

Pike 1

Percentage of caught fishes in Lake Falken

Percentage of caught fishes in Lake Erken

P e r c h

0 %2 0 %4 0 %6 0 %8 0 %

1 0 0 %

0 5 1 0 1 5 2 0 2 5 3 0

T o t a l le n g t h [ c m ]

Sto

ma

ch

C

on

ten

t

c r a y f i s h

f i s h

z o o b e n th o s

z o o p la n k to n

R o a c h

0 %

5 0 %

1 0 0 %

0 5 1 0 1 5 2 0 2 5 3 0

T o t a l le n g t h ( c m )

Sto

ma

ch

c

on

ten

t

Z o o b e n th o s

Z o o p l a n k to n

A l g a e

DiscussionThe diversity in Lake Erken is very high comparing

to Lake Falken, which is an almost unknown, little explored lake. According to our results the largest amount of fish diversity were in shallow areas (this was the case in both lakes Erken and Falken.)

Thanks for listening!