Document
Age Determination Methods for Northwest Atlantic Species
This manual documents age determination techniques used by staff at the Woods Hole Laboratory to…
Black Sea Bass
Black Sea Bass
Centropristis striata
Also Known As
Sea bass, Blackfish, Rock bass, Black bass, Tallywag
Quick Facts
Region
New England/Mid-Atlantic,
Southeast
About The Species
The black sea bass fishery in the U.S. operates from Maine to Cape Hatteras, North Carolina. Black sea bass are found in association with structured habitats. They migrate offshore and south in the fall, returning north and inshore to coastal areas and bays in spring. The black sea bass fishery predominantly uses trawls or rod and reel, but other gear includes longline, handline, pot, trap, gillnet, spear, and dredge. The market for black sea bass is for human consumption. U.S. wild-caught black sea bass is a smart seafood choice because it is sustainably managed and responsibly harvested under U.S. regulations. Implementing regulations are found at 50 CFR part 648 subpart I.
Population Level
Above target population levels in the Mid-Atlantic. Below target levels and fishing rate promotes population growth in the South Atlantic.
Fishing Status
At recommended levels.
Habitat Impacts
Fishing gears used to harvest black sea bass have minimal impacts on habitat.
Bycatch
Regulations are in place to minimize bycatch.
Status
- According to the 2017 stock assessment, the black sea bass stock in the Mid-Atlantic is not overfished and is not subject to overfishing.
- According to the 2018 stock assessment, the black sea bass stock in the South Atlantic is not overfished and is not subject to overfishing.
- Although both stocks of black sea bass have been assessed, the biology of this species is not well known and data are lacking, resulting in stock assessments that have a high degree of uncertainty.
- In the Mid-Atlantic, scientists at NOAA’s Northeast Fisheries Science Center conduct bottom trawl surveys to estimate the abundance of black sea bass and other species.
- In the South Atlantic, scientists, managers, and stakeholders assess the status of these stocks through the Southeast Data, Assessment, and Review (SEDAR) process.
Appearance
- Black sea bass are usually black, but smaller ones are more of a dusky brown.
- The belly is slightly paler than the sides.
- Fins are dark with dusky spots.
- The dorsal fin is marked with a series of white spots and bands.
- During spawning, dominant males turn bright blue and have a blue hump on their heads.
Biology
- Black sea bass grow slowly, up to 2 feet and 9 pounds.
- They are able to reproduce when they reach 1 to 3 years old.
- They are protogynous hermaphrodites—most black sea bass start out as females, and as they mature and grow they become males. Researchers aren’t sure why this happens, but one hypothesis suggests the relative scarcity of males in a spawning group may be the stimulus for a female to switch sex.
- Black sea bass spawn in coastal areas from January through July.
- Males gather a group of females to mate with and aggressively defend their territory.
- Depending on their size, females can produce between 30,000 and 500,000 eggs in a spawning season.
- Females can live up to 8 years; males live up to 12.
- Black sea bass eat whatever prey is available, but they especially like crabs, shrimp, worms, small fish, and clams.
- Little skate, spiny dogfish, monkfish, spotted hake, and summer flounder all feed on black sea bass.
Where They Live
- Along the U.S. East Coast from Cape Cod to the Gulf of Mexico.
Management
- NOAA Fisheries, the Mid-Atlantic Fishery Management Council, and the Atlantic States Marine Fisheries Commission cooperatively manage the black sea bass fishery north of Cape Hatteras, North Carolina.
- Managed under the Summer Flounder, Scup, and Black Sea Bass Fishery Management Plan:
- Annual catch limit divided between the commercial and recreational fisheries.
- The commercial catch limit is further divided among the states based on historical harvests.
- Specific management measures for the commercial fishery include:
- Minimum size limits.
- Minimum mesh requirements for trawls.
- A moratorium on entry into the fishery.
- Closed seasons.
- NOAA Fisheries and the South Atlantic Fishery Management Council manage the black sea bass fishery south of Cape Hatteras, North Carolina.
- Managed under the South Atlantic Snapper Grouper Fishery Management Plan:
- Commercial fishermen must have a permit to harvest black sea bass.
- Annual catch limits, commercial trip limits, and recreational bag and possession limits.
- Sale and purchase restrictions applicable after a commercial quota closure.
- Minimum size limit.
- Accountability measures in place to ensure overfishing does not occur, or to correct for overages if catch limit is exceeded.
- Seasonal area closures for the commercial black sea bass component of the snapper-grouper fishery.
- Trawling has been banned in the South Atlantic since 1989 to prevent impacts to habitat.
- Gear restrictions for fish pots:
- Commercial fishermen must have a pot endorsement to use a black sea bass pot to harvest black sea bass.
- Minimum mesh size to reduce catch of undersized black sea bass.
- Pots must have escape vents and escape panels with degradable fasteners to prevent bycatch.
- Limit on the number of pots per trip.
- Pots must be brought back to shore at the end of each trip to reduce bycatch and impacts to habitat and protected species.
- Pots are only allowed north of Cape Canaveral, Florida, to prevent adverse impacts on live-bottom habitat.
- Spatial and temporal closures to minimize entanglement risk for endangered North Atlantic Right Whales.
Science Overview
The most recent benchmark stock assessment for black sea bass was in 2016, where the stock was declared not overfished and overfishing was not occurring. The next assessment for black sea bass is an operational assessment, scheduled for August 2019. This operational assessment will incorporate revised Marine Recreational Information Program data.
Research, Surveys, & Data
Black Sea Bass Stock Status Based on Most Recent (2016) Benchmark Stock Assessment
| Stock | Black Sea Bass |
|---|---|
| Spawning Stock Biomass (SSB) | 48.9 million lb (2015) |
| SSBMSY Proxy | 21.3 million lb |
| SSB / ½ SSBMSY Proxy | 2.30 |
| Overfished Definition | The stock is overfished when SSB < ½ SSBMSY |
| Overfished? | No |
| Fishing Mortality Rate (F) | 0.27 (2015) |
| FMSY | 0.36 |
| F/FMSY | 0.75 |
| Overfishing Definition | Overfishing occurs when F > FMSY |
| Overfishing? | No |
| Current Rebuilding Program? | No. Black sea bass stock declared rebuilt in 2009 |
| Next Stock Assessment | Operational assessment scheduled for Summer 2019 |