text: The incredible moment over 1000 spider crabs formed a pyramid during their pre-migration has been caught on camera by an underwater photographer. The creatures were discovered at Blairgowrie Pier but are fast on the move to their proper migration at Rye Pier in a few weeks time. Spider crabs migrate once a year in the Port Phillip Bay area in Southern Victoria, piling on top of each other to create a moving mound. 1000 spider crabs were spotted by underwater divers in a moving migrating pyramid . The creatures were found at Blairgowrie Pier but are fast on the move to their proper migration spot . The crabs seemed unperturbed by the divers getting up close and personal with the moving mound . The video shows the creatures crawling in an upwards direction, presumably to get higher up. The crabs seem unperturbed as the two experienced divers get up close and personal during their filming. On closer inspection, some of the crabs seem to be holding chunks of food and shells in their pincers. These mobile mounds gather annually from April to July during what is thought to be their mating practice. These mobile mounds gather annually from April to July during what is thought to be their mating practice . On closer inspection, some of the crabs seem to be holding chunks of food and shells in their pincers . Spider crabs are easy to find during their migration as they are usually present in shallow water . The full migration is expected to occur in two to five weeks when the water temperature will drop to 14 degrees . Spider crabs are easy to find during their migration as they are usually present in shallow water of two metres or more. The diver had spotted the same creatures a month ago in larger masses in Blairgowrie. The full migration is expected to occur in two to five weeks when the water temperature will drop to 14 degrees Celsius. This will see tens of thousands of crabs flood the ocean floor.
target: The amazing moment over 1000 spider crabs formed a migrating pyramid has been caught on camera by an underwater photographer .
  The creatures were spotted at Blairgowrie Pier but are fast on the move .
  The video shows creatures crawling over each other in upward direction .
  They are expected to start their proper migration at Rye Pier in a few weeks .