Tweek was down in the launch bay, tinkering with some mechanical bits and bobs when she heard her Octo-Tablet ringing. She hopped over to it and saw the name Ranger marsh. She answered the call and was greeted with an image of her father's feet.

"Hey Tweek," the ranger said, "how 'r you doin'."

"I'm doing great, Pa," She answered, holding in her laughter ," i think you're using the wrong camera. You have to press the button in the top left of the screen to switch cameras."

Ranger Marsh then proceeded to use trial and error to find the button, turning is camera off and on again, muting and then unmuting himself and eventually finding the correct button, switching to front view so that Tweek could see his face

"Thanks Tweek," Marsh said ,"I never could get the hang of these fancy gadgets."

"So what brings you here?"

"It's the results of my biodiversity investigation," he explained ,"there's something i think your Octonaut friends might want to see."

Ranger Marsh adjusted his grip on his tablet and pointed it at a cork board with a map pinned to the wall. The map had a view of multiple bodies of water and little notes next to them but many had huge red Xs through them.

"You see those red marks," he said ,"each one is a lake or river where biodiversity is extremely low, meaning there aren't many different types of animals and plants living there and what's worse is that i found some new type of predatory fish in every lake on this map."

"Oh me oh my!" Tweak exclaimed, "What type of fish was it?"

"That information is beyond me," he said ,"i couldn't capture a specimen and believe me i've tried. They chew through my nets, escape my tanks, and bite me if I try to grab them. I've done a sketch but i'm no artist."

Marsh held up a piece of paper with a drawn image of an odd looking fish on it. It looked like an eel that had its head smashed in. It also had a rounded tail fin along with a prominent pectoral one too.

"That doesn't look like any fish I've seen before," Tweak said, looking at the sketch,"i'd better get the other octonauts in here."

Tweak put down her tablet and leapt over to the Octo-Alert and slammed her hand against it.

"Octonauts, to the launch bay!"

(Octo-alert sequence)

"What is it Tweak?" asked the captain.

"I got a call from my pa about a sudden drop in biodiversity and some mysterious fish that is appearing in lakes."

Shelignton barged his way to the front of the crowd.

"Let's see this fish!"

March held up his sketch again and Shelington went pale.

"Jumping jellyfish!" he exclaimed, sitting down on a chair ,"this is bad."

"What is it?" Peso asked fearfully.

"That peso, looks to me like a Snakehead,"

Shelington pressed some buttons on the launch bay control panel and brought up an image of a snakehead.

"I've seen one of them before!" Kwazii exclaimed ,"we were talking to some see-through fish. What's the big deal?"

"Snakeheads, just like any animal have their place in their ecosystem." Shelington explained ,"but the natural place for a snakehead to like is in asia and africa, and this one is in america."

"So an invasive species," dashi said ,"an animal that has colonised a habitat it is not native to, often causing ecological harm.

"Exactly."shelington agreed ,"snakeheads like these are incredibly voracious predators. In healthy ecosystems they are introduced to, they often drive out all of the native hunters and become the apex predator but in habitats that are fragile or already struggling, snakeheads can off balance the ecosystem causing it to completely collapse."

"What should we do about it," Ranger marsh asked, "if we let them stay here for too long they'll only wreak more havoc."

"Correct," Shelington answered ,"they'll spread throughout the waterways of America, killing local wildlife and damaging the fragile balance in these ecosystems. They might even be able to reach all the way up to the great lakes and disrupt their fragile ecosystem."

"Sounds like you could use a helping hand managing all these invasive fish," the captain said, "Dashi, pilot the Octopod as close to the everglades as you can, we'll meet up with ranger marsh there."

"Already on it captain"

"Tweak, make sure all the gups are in good condition and bring some of your specialty fishing gear"

"You got it cap,"

"Octonauts, to the everglades!"

The Octopod touched down in the gulf of Mexico, just by the Florida peninsula.

"This is as far as we can go captain," Dashi said ,"we have to travel the rest of the way with the gups."

"Ok then, everyone into the gups." the captain ordered ,"you too vegimals we need all help we can"

Turnip gasped and pointed at the image of the snakehead, chirping fearfully.

"Don't worry turnip," Shelington comforted ,"snakheads are carnivores and don't eat vegetables."

Turnip breathed a sigh of relief and then hopped in one of the gups, the other vegimals close behind.

The rest of the octonauts piled into the gups A,B,E,K and C and then all one by one shot out of the Octo-hatch and off to the everglades.

The gups soon entered the large waterways of the everglades and were peacefully driving along the murky water.

"It's amazing how everything has completely regrown after the fires," Dashi remarked, taking some pictures," this place is so lush."

The Octonauts continued until Captain Barnacles saw something huge swim underneath the water in front of the gups. The captain waved his hand to halt the gups.

The gups all stopped in their tracks and waited for a few seconds to see if the fish would surface again.

Kwazii jumped onto the top of the gub-B and gestured to Shelington to give him the giant fishing net in the back of the gup-A. Once Shelington had given it to him, Kwazii stood on the edge of the gup waiting silently.

Suddenly, a ripple in the water. Kwazii swung the net picking up a huge long fish. Dashi wheeled around and snapped a picture of the massive eel-like fish in the net that was too small to hold it whatsoever.

"It's a snakehead!" Paso exclaimed, quivering with fear.

"That's the biggest snakehead i've heard of!" Shelington exclaimed, "it must be one from the giant snakehead species."

(as of now there have been no reports of giant snakeheads in the everglades and from the research i did, they could probably survive there but i'm not certain)

The fish was five feet long and had the characteristic smashed in head look and a noticeable, trapezium shaped caudal fin. It had a pale underbelly and a much smaller fin down its spine compared to the one Shelington showed a picture of .

"Good luck next time buster!" the snakehead shouted before easily escapeing the net that was minute in comparison and hopped back into the water.

"Oh me oh my!" Tweak exclaimed, "is that what we're up against?"

"not all of them are that big," Shelington explained ,"but that's the sort of fish we'll have to capture."

The octonauts forged onwards and soon arrived at Ranger Marsh's house. Marsh looked the crew, up and down, noticing how soaked Kwazii and Shelington were.

"I see you've met our new neighbour," Marsh chuckled ,"she's a feisty one."

"Well I'll say," Kwazii remarked, trying to pick the wet debris off his uniform.

"Well you all better come inside," he said ,"we have more than just one fish problem."

The ranger invited his guests inside and explained to them the situation.

"Up north are lots of smaller 'snakeheads'," he explained.

"Those would be northern Snakeheads," Shelington interjected

"I need a group of you to gather them up as best as you can. Then we have the huge one here in the everglades and tweak, i'd like you and your gup-K to help me capture this slippery fish."

"You got it pa!" tweak replied.

"And the rest of ya," Marsh said surveying the rest of hte octonauts,"you head up north and deal with the infestation up their. I trust that tweak knows what we'll need to catch the big one."

"Mm hmm," tweak relied, nodding ,"i've filled the Gup K with everything we will need, you can take the rest of the gups and all the equipment inside."

"I think we'll need it," the captain remarked ,"these fish sound slippery."

"We'll meet back up once our missions are complete," the ranger said ,"but make sure you don't underestimate these fish, they'll get the better of you."

The octonauts (minus tweak) manoeuvred their gups (minus the gup K) out of the everglades, along the coast, and up one of the rivers that lead into the north america mainland.

Ranger Marsh had given the octonauts a paper map of the area and Dashi had spent the last half hour tearing her hair out trying to find the exact location of the infestation but it was pinpointed in time and the crew were following a path to the area up a large river .

"We're here!" dashi announced and everyone stopped their gups,

Teh octonauts got out and regrouped on the river bank.

"Octonauts," the captain announced," the most important thing right now is to be careful. These fish can be aggressive so.."

"I GOT ONE CAPTAIN!" Kwazi yelled from the river.

He scrambled out the water with a huge wiggling fish in his arms. The ran over to his crew and dumped the fish into the giant water cooler the octonauts had set up to hold the snakeheads.

(like a giant version of one of these without a lid. It's not meant to cool the water I just imagined the tub having that sort of look)

"This is false prosecution!" the fish shouted, swimming about the cooler,"i'm innocent."

"I'm not fooling for your tricks you scallywag!" Kwazii replied, very much proud of himself ,"i know your secrets mr snakehead."

"Actually that's not a snakehead," shelington pointed out,"that's a bowfin. It's a native fish but is often mistaken for Snakeheads."

(a snakehead compared to bowfin)

"I told you, I committed no crime! Now let me go, you have no right to keep me in custody" the fish complained.

"Oh," Kwazii said defeatedly ,"sorry about that misunderstanding Mr Bowfin."

Kwazii then picked up the fish and released it back into the river.

"As I was saying," Barnacles continued ,"be careful and don't detain any innocent bowfins. Look out for the concave skull and the extra long anal fin. Now let's do some fishing."

Peso pulled a giant net out of the back of the gup and waddled over to the closest little pond. He put a morsel of food in the bottom of it and let the end if hte net sink into the water.

"Oh, this isn't so bad," peso remarked, sitting down on the grassy bank, "we should have land adventure more often."

As he was just relaxing, peso saw a dark form under the water slowly swim into the net and ate the little bit of food that he had put there.

"GAAAAH!" he yelled instinctively bringing the net upwards trapping the fish.

"GAAAH!" The fish also yelled squirming about in the net.

Everyone turned to see peso holding the captured snakehead high in the air danging in the mesh of the net. Everyone gathered round and looked at the fish writhing about in the net.

"Well that's one down," the captain remarked ,"it's a good start."

The fish seemed to be gnawing on the fibres on the net glaring at the octonauts with its beady eyes.

"Umm.. Now just take it over to transportation tank matey," Kwazii suggested , seeing peso still just lying on the floor staring at the snakehead. Peso shakily stood up and as he did the snakhead suddenl dropped out of the net.

"Your nets are no match for my teeth, Panda bird!"

The Snakehead began to wriggle back towards the water but Dashi stepped in and picked the fish up with one of tweak's grabbers and with the fish loudly shouting kid friendly swears, she dropped it into the water cooler.

(it'd shout things along the lines of: "oh you cheesy mud faced minnow, free me dagnabbit!")

"What have you done!" the fish yelled ,"why have you put me in a square pond!"

"We're taking you back to your natural habitat ," the captain explained, "we mean you no harm."

"I don't believe ya," the fish replied ,"I think that yous are gonna try and eat me."

"As a matter of fact," Shelington mentioned," Snakeheads are used in culinary..."

"Not the time Shelington," the captain cut in, "On my honour as an Octonaut, i promise that i won't eat you"

"YOU'LL NEVER TAKE ME ALIVE!"

The fish, evidently not trusting the octonauts leapt out the tub and began to wriggle towards the river.

Kwazii ran over and tossed it back in the container, much to the frustration of the snakehead.

"Vegimals," the captain ordered," your job is to keep the snakeheads in this water cooler, try and build a makeshift cover to help keep them in."

"Cheepa Cheepa," Tunip replied dutifully.

"everyone else, fan out and catch as many snakeheads as you can. Octonauts, let's do this."

(this will be a three parter special so vote if you liked it and follow me for more. bye!)