
Adam and Ryan with two huge rock. The bigger was 45 pounds!

Box of Rocks
Yesterday (Mar. 24, 2010) we went out on what eventually became a sparkling, warm, sunny early spring day on The Bay. The action came quickly as the rubber bands were popping on the planer board rods. At one point, we had three big rockfish hooked up at the same time. Three scientists from the University of Maryland’s Center for Environmental Studies (UMCES) located on Solomons Island, Maryland, Adam Peer, the lead researcher on this particular project, and his assistants, Ryan Woodland and Dave Loewensteiner were armed with special DNR permits which allow taking of certain fish for research purposes. They hauled in the fish and placed them in coolers. The day wore on and the bite slowed as the weather improved, but we ended up with 26 big rock on board.
These fish were not destined for the dinner table, however. They were destined for Adam’s lab located at the UMCES on Solomons Island in the new Fisheries Research Complex. I climbed the steps to the second floor and soaked in a panoramic view of the mouth of the Patuxent River and the Chesapeake Bay and Hooper’s Island beyond. I entered the hall, then the lab and was overwhelmed by an intoxicating stench of fish in varied post-mortem states. I found Adam and Dave clad in orange Grunden’s fishermen’s aprons and blue latex gloves smeared with blood and scales. Adam stood at a stainless steel counter with the head of a rockfish and an in-tact, ten-inch menhaden in front of him. Menhaden is a feeder fish found throughout the Atlantic Ocean. The menhaden had come from the stomach of one of the rockfish . Adam had removed the otolith stones from the head of the striper. These ‘stones’ have growth rings similar to those found in trees and are used to determine the age of the fish. As Dave and Adam cut up the fish they recorded data on their newly acquired samples.
A little later in my visit Adam hefts out the biggest sample of the previous day, a 45-inch, 45-pound monster. It’s big enough and awkward enough that he requires a little help from Dave. At a glance, Adam guesses the fish to be around 20 years old. During research last year, Adam studied three stripers that were each just that; 20 years old. Poor fish never even got to enjoy a legal beer! He won’t know for sure how old this particular fish is until the otolith stones are analyzed. A fish like this can produce as many as 4-6 million eggs in a single spawn.
Adam is currently working on a PhD in fisheries biology. His research focuses on the characteristics of spawning striped bass in the Chesapeake. He is trying to determine how characteristics such as the age, size, and energy density of individual fish affect their productivity as well as how these characteristics affect the growth and survival rate of their offspring. One of the methods he uses is to measure the caloric levels in the eggs of spawning females for which he has an instrument. That instrument can also be used to measure energy levels in other parts of the fish to determine where specifically (such as the liver or muscle tissue) the fish store energy.
The reproductive quality of a fish is not necessarily parallel with the size of the fish. In other words, the fecundity of a fish can drop off or increase in certain size or age ranges, much as it does in humans. Because of this, Dave asserts “Slot limits are the most effective fisheries management tool theoretically, but in practice they don’t work.” A ‘slot’ limit is when fishermen are allowed to keep fish above a certain size and below another size, say if you can keep striped bass between 18” and 36”. I have personally seen the evidence that they don’t work. It’s because it is very difficult for fisherman to determine the size of the fish they are targeting with any precision and the result is a high rate of fish outside the slot getting caught, injured and killed unintentionally.
Adam hopes that in the end his research will help fisheries managers make better stock assessment models which in turn should enable them to make better decisions regarding size limits and the timing of openings and closures of fishing seasons. He said “(My goal) …is to better manage and sustain the fishery. The more we know about what factors influence the reproductive potential of the fish the better we’re able to predict the next year of fish that join the population.”
Trophy rockfish season opens April 17. I am offering a little better rate on some weekdays this year, so get in touch and book a trip!