Logo: TVO Kids.

Logo: Fifth Ground Entertainment.

In animation, a sign with the name of the show falls in the water.

The name of the show reads "Leo's Fish Heads."

A clip shows a group of friends fishing.

Leo, an animated fish says WE ARE THE FISHHEADS
EXPLORER CLUB,
SAYAT, CHRISTIAN,
AND ME, LEO.

Sayat is around 12. She has long curly brown hair in a high ponytail and wears a pink sweater, a neon green life jacket, gloves, and a cream cap hat.

Christian is around 12, with short straight light brown hair and wears an orange jacket, a blue life jacket, and rubber gloves.

Leo says TOGETHER, WE'RE GETTING WET
AND MUCKY
WORKING WITH EXPERTS AND
HELPING OUR AQUATIC FRIENDS.

A caption reads "TVO Kids presents: Fish Heads explorer club."

Leo says EACH DAY WE'RE ON A NEW MISSION
EXPLORING WHAT'S GOING ON
ALONG THE SHORELINES
AND UNDER THE WAVES.
SPLISH, SPLASH, GRAB YOUR BOOTS
AND YOU CAN BE A FISHHEAD TOO.
(WATER BURBLES)

Leo says PSST... I'M ON THE LOOKOUT
FOR SOME ALIEN INVADERS
WHO HAVE BECOME BIG
TROUBLEMAKERS!
THEY ARE NONE OTHER THAN
THE RUSTY CRAYFISH.
AND YES, THEY ARE AT THE TOP
OF OUR FISH FINDER LIST TODAY.
THE RUSTY CRAYFISH
ARE AN INVASIVE SPECIES.
IN THEIR HOME WATERS BACK
IN THE OHIO RIVER,
HAH, NOT A PROBLEM.
BUT HERE, THEY'RE A BIG
PROBLEM, MHMM.
THE RUSTY CRAYFISH GROW LARGER
THAN MOST CRAYFISH.
SO ONCE THE PUSHY RUSTY MOVE
INTO A RIVER OR STREAM,
THEY PRETTY MUCH TAKE IT OVER.
BECAUSE OF THIS,
OUR NATIVE CRAYFISH POPULATIONS
ARE RAPIDLY DECLINING.
AND SO ARE THE SNAILS, ALL
KINDS OF WATER BUGS AND CLAMS.
SAYAT AND CHRISTIAN ARE MEETING
UP WITH JESSICA FANG
AND HER TEAM, FROM THE TORONTO
AND REGION CONSERVATION
AUTHORITY.

An animated map shows in on the Rouge River area.

Leo says THEIR MISSION IS TO HELP REMOVE
SOME OF THOSE INVADING
RUSTY TROUBLEMAKERS
AND HELP THEM STOP SPREADING.

A caption reads "Jessica Fang. Toronto and región conservation authority."

Jessica is in her thirties, with long straight Brown hair in a ponytail and wears a blue T-shirt, a beige overall and a white cap.

She says THANK YOU FOR HELPING OUT,
FISHHEADS.
WE SET SOME MINNOW TRAPS
LAST NIGHT.
NOW WE'RE GOING TO GO CHECK
THEM TO SEE
IF WE CAUGHT ANYTHING.

Christian says WE JUST CAN'T WAIT
TO GET IN THE RIVER
AND SEE THEM UP CLOSE.

Sayat says YEAH.

Jessica says YEAH.
HI, ELIZABETH...

Elizabeth says HEY. HOW IS IT GOING, GUYS?

The caption changes to "Elizabeth Petrov. Toronto and region conservation authority."

Elizabeth is in her twenties, with long straight blond hair in a ponytail and wears a blue T-shirt, a beige overall and a beige cap hat.

Sayat says HI. DID YOU START WITHOUT US?

Elizabeth says OH, I WAS JUST TAKING A PEEK
TO SEE
IF I CAN FIND ANY RUSTY
CRAYFISH.

Sayat says WHY IS IT SO IMPORTANT
TO STUDY RUSTY CRAYFISH?
THEY'RE AN INVASIVE SPECIES.

Elizabeth says THEY ARE.
WE'RE JUST TRYING TO LOOK
FOR THEIR POPULATIONS
AND THEIR DISTRIBUTION,
SO HOPEFULLY WE CAN HELP
OUR NATIVE CRAYFISH OUT.

A caption reads "Native crayfish. Northern Clearwater crayfish, robust crayfish, virile crayfish."

Elizabeth says ARE YOU READY TO GET IN
THE WATER?

Sayat says OH YEAH!

Christian says BORN, READY!

Elizabeth says LET'S DO IT!

Leo says SAFETY CHECK?
OKAY. I'VE SAID IT BEFORE
AND I'LL SAY IT AGAIN:
ALWAYS WEAR A PERSONAL
FLOTATION DEVICE,
ALSO KNOWN AS A LIFE JACKET,
WHEN AROUND THE WATER.
AND NEVER GO INTO A RIVER, LAKE
OR STREAM WITHOUT AN ADULT.
EVEN THE CALMEST AND SHALLOWEST
OF RIVERS CAN BE DANGEROUS
WITH ONE SLIP ON A ROCK.
SO, PLAY IT SAFE,
BECAUSE SAFE IS SMART.
AND THAT'S HOW WE FISHHEADS
ROLL. OH YEAH!

Christian says READY.

Sayat says READY.

Jessica says OH, I LOVE HOW YOU TWO KNOW
HOW TO PLAY IT SAFE AROUND
THE WATER.

Christian says WE WERE TAUGHT BY THE BEST.

Sayat says OH YEAH.

Leo says MHMM.

They spot crayfish shells on a rock.

Sayat says ARE THOSE CRAYFISH SHELLS?

Elizabeth says OH YES.
THIS IS A SIGN THAT
THEY'RE AROUND HERE.

Leo says CRAYFISH ACTUALLY PUSH
THEMSELVES OUT
OF THEIR OLD SHELLS
AS THEY GROW AND GET BIGGER.
IT'S BECAUSE THEY ARE
EXOSKELETONS
WHICH MEANS THEIR SKELETON IS
ON THE OUTSIDE OF THEIR BODY,
NOT LIKE YOU.
YOURS IS ON THE INSIDE.
YOUR SKELETON IS YOUR BONES.
SO, WHEN A CRAYFISH GROWS,
THEY HAVE TO LEAVE THEIR SHELLS
BEHIND. COOL HUH?

Jessica says LET'S GO CHECK OUT OUR MINNOW
TRAPS.

Christian says IS THAT THE MAIN WAY YOU
CAPTURE CRAYFISH?

Elizabeth says WE ACTUALLY USE A FEW
DIFFERENT TYPES.
BECAUSE CRAYFISH ARE NOCTURNAL,
JESSICA WAS ACTUALLY HERE
LAST NIGHT
TO INSTALL SOME MINNOW TRAPS.

The caption changes to "Nocturnal means a creature who is more active and awake at night."

Elizabeth says BUT WE'RE ALSO GONA BE USING
SOME NETS TODAY
TO SEE IF CAN FIND ANY. SHALL
WE GO CHECK OUR MINNOW TRAPS?

Christian says YEAH.

Elizabeth says LET'S.

A clip shows images of a fish trap in the shape of a barrel.

Christian says DID YOU KNOW THAT THESE
ARE CALLED MINNOW TRAPS?
BECAUSE THEY'RE COMMONLY USED
TO CAPTURE SMALL
FRESH WATER FISH KNOWN
AS MINNOWS.
THE WIRE MESH TRAPS ARE FIRST
SECURED WITH FISHING LINE
AND THEN HOOKED UP
TO A TREE BY THE SHORE.
THEY ARE THEN BAITED
WITH CAT FOOD
TO CAPTURE CRAYFISH BECAUSE
THEY'RE ATTRACTED
TO THE SMELL OF IT.
THEN THEY ARE PLACED INSIDE
THE RIVER
WHERE IT'S DEEP ENOUGH
TO COVER THE WHOLE TRAP.
A LEDGE WITH A ROCK
IS THE IDEAL SPOT.
THEN YOU MUST MAKE SURE THAT
ONE SIDE OF THE MINNOW TRAP
IS DIRECTLY FACING THE FLOW
OF THE RIVER.
SO THEN THE CRAYFISH CAN EASILY
SWIM INSIDE AND BE TRAPPED.
NOW YOU KNOW.

Jessica says OKAY, NOW LET'S CHECK WHAT
WE'VE GOT IN THIS MINNOW TRAP
TO SEE WHAT WE CAUGHT.

Sayat says AAH.

Christian says WOW, THERE'S AT LEAST FOUR
CRAYFISH.

Sayat says LOOK AT THEM!

Elizabeth says IT ACTUALLY LOOKS LIKE
THE MAJORITY OF THOSE
ARE RUSTY CRAYFISH.

Sayat says OH YEAH.

Christian says WHAT ARE THOSE LITTLE
PEBBLE THINGS?

Jessica says THE CAT FOOD THAT I PUT INTO
THE TRAP LAST NIGHT.

Sayat says CAT FOOD?

Jessica says YES,
THEY'RE ONE OF THE BEST BAITS
TO ATTRACT CRAYFISH
AND MINNOWS INTO THE TRAPS.
THEY'RE STILL EATING
THE CAT FOOD RIGHT NOW.
NOW LET'S TAKE A CLOSER LOOK
AT THESE CRAYFISH.
LET'S GO.

Leo says WOW! HE LOOKS A LOT LIKE
HIS COUSIN THE LOBSTER.

Christian says WOW... WHAT DO THE RUSTY
CRAYFISH EAT?

Elizabeth says THEY'RE ACTUALLY SUPER
FEROCIOUS.
THEY EAT TWO TIMES MORE THAN
OUR NATIVE CRAYFISH.

Christian says LIKE WHAT?

Jessica says THEY EAT PLANTS, CLAMS,
SNAILS.
AND THE LARGER ONE CAN EAT
OTHER CRAYFISH AND EVEN FISH.

Christian says WOW!
THE RUSTY CRAYFISH SEEM TO BE
TROUBLE ON SO MANY LEVELS.

Sayat says IT'S REALLY NOT THEIR FAULT.
THEY'RE JUST DOING WHAT THEY
NATURALLY DO.
BUT THEY'RE JUST DOING IT
IN THE WRONG SPOT.

Christian says TRUE. BUT HOW DID THEY GET
HERE?

The caption changes to "Fish talk with Leo."

Leo says ALIEN INVADERS ARE HERE...
LIVING AMONGST US.
AHHH!
OKAY, THEY'RE NOT ALIENS
FROM OUTER SPACE,
BUT ANOTHER PART OF THIS WORLD.
RUSTY CRAYFISH CAME TO ONTARIO
WATERS IN TWO MAIN WAYS.
ONE, BY FISHERMEN WHO BOUGHT
THEM AT BAIT SHOPS
TO HELP LAND THE "BIG ONE."
AND DUMPED THE CRAYFISH
THEY DIDN'T USE INTO THE WATER.
AND BE SURE TO TELL YOUR
SCIENCE TEACHER THIS ONE,
IN CASE THEY DIDN'T ALREADY
KNOW.
THE SECOND WAY THEY WERE SPREAD
WAS THAT MANY
OF THE RUSTY CRAYFISH STUDIED
IN CLASSROOMS
ARE RELEASED INTO OUR LOCAL
RIVERS.
SURE YEAH, IT SOUNDS LIKE
A GREAT IDEA.
BUT IN THIS CASE THAT ACT
OF KINDNESS
RESULTED IN BIG ECOLOGICAL
TROUBLE!
AND THAT'S HOW THE INVASIVE
RUSTY
STARTED TAKING OVER OUR STREAMS.

Jessica says SO, THESE ARE DEFINITELY
RUSTY CRAYFISH.
I'M GOING TO SHOW YOU
HOW I CAN TELL.
YOU SEE THE RUSTY SPOT
ON THE SIDE?

Christian says YEAH.

Jessica says AND TAKE A LOOK AT ITS HEAD.
THE TOP OF ITS HEAD IT LOOKS
LIKE IT'S BEING PINCHED IN.

Sayat says OH YEAH.

Jessica says AND ALSO TAKE A LOOK
AT THE DARK BAND ON HIS CLAW.
ISN'T THAT COOL?

Sayat says YEAH.

Jessica says THIS IS A MALE CRAYFISH
AND THIS IS A FEMALE CRAYFISH.
CAN YOU TELL THE DIFFERENCE?

Sayat says NO. HOW CAN YOU TELL?

Jessica says YOU CAN SEE THAT THE MALE HAS
EXTRA TWO BITS HERE
AND THE FEMALE HAS THE
CAPABILITY OF CARRYING EGGS.
WHEN THEY CARRY EGGS THEY'RE
GOING TO LOOK LIKE THIS.

Sayat says WHOA! I LEARNED THAT RUSTY
CRAYFISH CAN LAY UP TO 200 EGGS.

Christian says WOW! 200 IS A LOT!
IF THOSE WERE CHICKEN EGGS,
WE'D HAVE ENOUGH EGGS TO MAKE
AN OMELETTE FOR 66 PEOPLE,
WHICH IS ONE OF THE REASONS
THE POPULATION HAS EXPLODED.

Jessica says EXACTLY. ONCE THEY ESTABLISH
THEIR POPULATION
IN OUR WATERSHED IT'S
IMPOSSIBLE TO GET RID OF THEM.
SO WE REALLY HAVE TO PREVENT
THEM FROM GETTING
INTO OUR WATERSHED
IN THE FIRST PLACE.

Christian says THEY REALLY ARE INVADERS.
LIZ, HOW CAN YOU COMPARE THEM
WITH THE NATIVES?

Elizabeth says GOOD QUESTION. WHY DON'T WE
GRAB A NET AND GO SEE
IF WE CAN FIND SOME NATIVE
CRAYFISH.

Christian says YEAH.

Elizabeth says LET'S DO IT.

Elizabeth says ALRIGHTY, SHOULD I CHECK
RIGHT NOW?

Sayat says SURE.

Elizabeth says LET'S DO IT.
LOOK AT THAT GUY.

Christian says WHOA! IT'S REALLY BIG.

Leo says LOOKS LIKE THEY'VE GOT
A NATIVE CRAYFISH!
WAY TO GO, FISHHEADS!

Elizabeth says DO YOU GUYS THINK WE SHOULD
GO COMPARE THEM OVER TO THE
RUSTY?

Sayat and Christian say YEAH!

Elizabeth says LET'S DO IT.

Jessica says WOW! GREAT CATCH.
THESE ARE OUR LARGEST NATIVE
CRAYFISH IN ONTARIO.

Christian says HOW DO THEY GROW SO BIG?

Elizabeth says THEY'RE VERY WELL FED.

Christian says SO WHAT DO THEY EAT? DO THEY
EAT THE SAME AS THE RUSTIES?

Jessica says ALL THE CRAYFISH PRETTY MUCH
EAT THE SAME FOOD.
BUT RUSTIES JUST EAT A LOT MORE.

Sayat says WHAT IS THE FUZZY STUFF
ON THEM?

Jessica says THESE ARE MATURE FEMALES SO
THEY'VE BEEN AROUND FOR A WHILE
SO THESE ARE THE ALGAE GROWING
ON THEIR BODY.
THESE GUYS ARE THE LARGEST
CRAYFISH IN ONTARIO.
THAT'S WHY WE STILL
HAVE THEM HERE
BECAUSE THE OTHER SPECIES ARE
SMALLER THAN THE RUSTY CRAYFISH
AND THEY'RE A LOT SMALLER
THAN THESE GUYS
SO THEY PROBABLY DISAPPEARED.
THEY OUT COMPETE BY THE RUSTY
CRAYFISH.
DO YOU WANT TO SEE HOW THIS
FEMALE CAN COMPETE
WITH THE YOUNG RUSTY CRAYFISH
THAT WE CAUGHT TODAY?

Sayat says YEAH, YOU BET!

The caption changes to "Rusty versus native crayfish racetime."

The kids put the crayfish in a tank.

Sayat says HEY CHRISTIAN, I BET THE
RUSTY CRAYFISH IS GOING TO WIN.

Christian says I'M ROOTING FOR THE UNDERDOG
NATIVE CRAYFISH.
COME ON, HOME TEAM.

Sayat says 3... 2... 1!

They say GO
GO
GO!

Sayat says NO! WRONG WAY!

Christian says YES! YES!

Sayat says YOU CAN DO IT!

Christian says OH! NO
NO
NO

They all say YEAH!

Christian says NATIVE WINS.

Leo says WAY TO GO HOME TEAM!
YOU SHOW 'EM! WHOO
HOO!

Sayat says FAIR AND SQUARE.

Elizabeth says ALRIGHTY GUYS, SO LET'S BRING
THE RUSTIES BACK TO THE LAB
AND WE CAN RELEASE THE NATIVE
BACK INTO THE WATER.

Jessica says OH WAIT. BEFORE WE DO THAT
I WANT TO REPORT
TODAY'S SIGHTING TO THE EDD
MAP SYSTEM.

Sayat says WHAT'S THAT STAND FOR?

Jessica says IT'S THE EARLY DETECTION AND
DISTRIBUTION MAPPING SYSTEM.
THE SYSTEM HELPS A LOT OF
ORGANIZATIONS
TRACKING INVASIVE CRAYFISH
IN OUR PROVINCE.

Sayat says ISN'T IT AMAZING HOW RUSTY
CRAYFISH CAN BE INVADERS
IN ONE SETTING AND THEY CAN BE
REGULAR CRAYFISH
IN THEIR HOME WATERS?

Christian says IT SURE IS.
ALL THE MORE REASON FOR US
TO DO WHATEVER WE CAN
TO HELP THESE NATIVE CRAYFISH.

A sign appears with the caption "Fish heads alert."

Leo says ATTENTION FELLOW, FISHHEADS!
THE BEST WAY TO HELP IS
TO LEARN THE DIFFERENCE
BETWEEN THE NATIVE AND INVASIVE
CRAYFISH
SO YOU KNOW WHICH ONE
NOT TO PUT IN THE WATER.
ALWAYS CHECK YOUR BAIT BUCKETS
TO BE SURE
YOU'RE NOT PUTTING AN INVASIVE
RUSTY INTO YOUR LAKE OR RIVER.
IF YOU SPOT THEM IN A STREAM,
TAKE A PHOTO AND REPORT IT
TO YOUR LOCAL CONSERVATION
AUTHORITY.

Christian says I'M GONNA MAKE SURE THAT MY
TEACHER
NEVER RELEASES A CRAYFISH
FROM MY SCIENCE CLASS
UNLESS SHE'S A 100 percent SURE
THAT IT'S NATIVE.

Sayat says ME TOO. AND I'M GOING TO
TEACH MY FRIENDS
HOW TO SPOT A RUSTY CRAYFISH.

They do a special handshake and say FISHHEADS!

Leo says THAT'S RIGHT.
WE MUST ALL DO OUR PART
TO STOP THE INVADERS.

In animation, an alien behind Leo makes fun of him.

Music plays as the end credits roll.