submission by chrono673 for make a scene using some motion (View the other submissions)
function fish(thisx,thisy){
fill('orange')
ellipse(thisx,thisy,100,70)
fill(0)
ellipse(thisx+30,thisy-10,20,20)
line(thisx+30,thisy+5,thisx+45,thisy+5)
}

function setup(){
  var myCanvas = createCanvas(windowWidth,windowHeight); //you must keep this line unmodified

  fishx = []
  fishy = []

  
  for(i=0;i<20;i++){
    fishx[i] = random(width)
    fishy[i] = random(height)
  }
}

function draw() {
  background('deepskyblue')

  
  fill(255)
  for(i=0;i<fishx.length;i++){
    thisx = fishx[i]
    thisy = fishy[i]
    fishx[i] +=1
    if(fishx[i]> width){
     fishx[i] = 0
    }

    
    
    fish(thisx,thisy)
  }
for(i=0;i<fishx.length;i++){
    thisx = fishx[i]
    thisy = fishy[i]
    fishy[i] +=1

    if(fishy[i]> height){
     fishy[i] = 0
    }

    
    fill('brown')
    rect(thisx+50,thisy+20,20,20)
  }

  
}