Just before Christmas, some invasive species experts wrote their own version of the “Twelve Days of Christmas.”
As reported by the Journal Sentinel, here’s a portion of the song intended to increase awareness about exotic species and the problems that they create:
"On the 12th day of Christmas, a freighter sent to me,
"Twelve quaggas clogging: Quagga mussels, which can tolerate colder water than zebra mussels as well as colonize soft substrates, are now the dominant invasive mussel in Lake Michigan. Just like zebra mussels, quagga mussels are quite effective at clogging water intake pipes and other infrastructure. Mitigating these impacts has cost Great Lakes residents millions of dollars.
"Eleven gobies gobbling: Round gobies are very effective egg predators. Their advanced lateral line system (a series of fish sensory organs) allows them to find eggs that native egg predators are unable to.
"Ten alewives croaking: Until the introduction of Pacific salmon, alewives died off in such great numbers that tractors were required to remove them from Lake Michigan beaches. Salmon now do a great job controlling alewife numbers, but there are still alewife die-offs due to spawning-related stresses.
"Nine eggs in resting: The spiny waterflea and the fishhook waterflea produce tiny resting eggs that can survive long after the mature waterflea has perished. The resting eggs also can survive extreme environmental conditions, so it is imperative to make sure recreational equipment is cleaned to prevent spreading these invasive crustaceans.
"Eight shrimp 'a swarming: The bloody red shrimp, Hemimysis anomala, is one of the Great Lakes' most recently discovered ballast invaders. The effects on the Great Lakes are largely unknown, but the shrimp may compete for food with young fish and have been found in the diet of some fish in the Great Lakes.
"Seven carp and counting: There are seven species of invasive carp in the United States. There are the four collectively known as Asian carp (black, grass, silver and bighead), the common carp, the crucian carp, and last but not least, the Prussian carp (aka the goldfish). While the current focus is on the silver and bighead carp, all of these carp cause problems one way or another. Hopefully, we won't actually be counting any other carp species soon.
"Six lamprey leaping: This is actually some bad lamprey biology humor. Lampreys are poor jumpers, especially when compared with trout and salmon, so a small low-head obstacle or ledge can prevent lampreys from moving farther upstream while other fish leap over the obstacle. Thus, physical barriers or one-way managers are preventing lampreys from invading more streams in the Great Lakes basin.