What's in YOUR Estuary

Summer 2018 Issue

$Image of 91��Ƶ marine science professor, Dr. Mark Sullivan, and studnets sort a seine net catch in Port Republic, NJ$

(Bottom to Top): 91��Ƶ Marine Science faculty member Dr. Mark Sullivan, Joseph Citro, Professional Science Master's in Environmental Science graduate student, Marine Field Station technician David Ambrose, Marine Science '14, undergraduate student Caroline Bowman, Biology and Teacher Education student, and Stockton alumnus
Sean Lynch, Marine Science ’17, sort a seine net catch in Port Republic, N.J. (Photo credit: Susan Allen).

Estuaries (“where the river meets the sea…”) provide more than 30,000 km² of nursery habitat for over two-thirds of the economically important fish species along the East Coast of the United States. A large percentage of these species are “estuarine-dependent” - they reproduce in the ocean/lower estuary/river, enter estuaries as very young fish, survive to become juveniles, and (hopefully) join the adult population. As a result, the composition, size and numbers of young fish in estuaries function as important indicators of population health, particularly if standardized data with broad coverage are available. The Mullica River-Great Bay (MRGB) estuary is one such system on the East Coast that provides a wide variety of habitats for estuarine-dependent species. Summer flounder (“fluke”), winter flounder, bluefish, black sea bass, and tautog are notable economically and ecologically important species that share critical links to New Jersey estuaries during early and, in many cases, adult life.

91��Ƶ’s Nacote Creek Marine Field Station is located 15 minutes from Galloway campus and has supported undergraduate course-based fish sampling for over two decades, primarily using seine nets deployed from land or vessel and hauled back to shore by 91��Ƶ.

This work was recently synthesized in a Marine Science Program Distinction project by Caroline Schkeeper, Marine Science ’15, spanning eight-plus years, 100 seine hauls and 19,131 individual fish. Overall, these collections afforded 91��Ƶ hands-on experience and training, but did not always connect the data with fishery managers. In 2016, the New Jersey Department of Environmental Protection generously funded a three-year project that continues this tradition of immersive field experiences at 91��Ƶ, but also aims to make the data more standardized, multi-seasonal and available to fishery managers.

$Image of cryptic juvenile hogchoker caught in seine net in Port Republic, NJ$

A cryptic juvenile hogchoker – a type of flatfish easily mistaken for leaf litter - sampled with a seine net in Port Republic, N.J. (Photo credit: Susan Allen).

Since May 2016, twice-per-month seine collections from May–November (monthly from November–April) have been conducted in the MRGB from Little Egg Inlet to upriver beyond the Garden State Parkway bridge. In addition, a local commercial waterman, Newt Sterling, has been engaged to collect monthly fyke (a long, stationary, cylindrical net) data for highly migratory species (striped bass, river herring) in Great Bay during the winter and spring months. By the close of year one, 238 samples were completed across the two gear types collecting 90,424 individual fish from 66 different species. To date, over 100 91��Ƶ have gained direct hands-on experience from this funded project through independent study work, volunteer opportunities, four undergraduate courses (Introduction to Marine Biology, Fisheries Science and Management, Introduction to Ichthyology, and New Jersey Field Ichthyology) as well as programs for high school 91��Ƶ 91��Ƶ Science Enrichment Academy - (SEAS).