Worried Water Vertebrates

And the sun keeps on shining a bit warmer now in Mars.
But rain keeps away and fish in the cisterna* are worried.
 
Is this the end of their world? Tiny fishes lives on what?
Planned cannibalism every two, three months, perhaps?
 
Small and translucent I see their quickening heart beats.
Open the cisterna’s lid so they can see the blue clear sky.
 
Since they may take me for the creator must show them 
They are not forsaken and I cannot be blamed for this.
 
And the sun keeps on shining, a bit warmer now in Mars,
But Louis, the farmer, and I know this can lead to calamity.
 
*Cisterna... a place to store rainwater (Portuguese)