Atlantic croaker (Micropogonias undulatus) Otolith: are one of the most abundant inshore demersal fishes along the southeastern coast of the United States. This species has been reported to live over 15 years old.
Atlantic croaker (Micropogonias undulatus) : This sectioned croaker otolith is 6 years old. The oldest Atlantic croaker aged by our surveys: ChesMMAP Survey 18 years old, NEAMAP Survey 12 years old
Black drum (Pogonias cromis) Otolith : are a long-lived fish and are the largest member of the family Sciaenidae on the Atlantic coast.
Black drum (Pogonias cromis): This sectioned black drum otolith is 41 years old. The oldest black drum aged by ChesMMAP was 54 years old.
Black seabass (Centropristis striata) Otolith: are protogynous hermaphrodites that is, initially they are females, but larger fish reverse sex to become males. Black seabass are reported to live as long as 20 years, however, individuals longer than 15 inches, the size of an approximately 8 year old fish, are uncommon. (Source: Fishes of the Chesapeake Bay)
Black seabass (Centropristis striata): This sectioned black seabass otolith is 7 years old. The oldest black seabass aged by our surveys: ChesMMAP 2 years old, NEAMAP 16 years old
Bluefish (Pomatomus saltatrix) Otolith: are a migratory pelagic species that primarily travels in schools. A highly sought after recreational finfish. Reported to live more than 12 years.(Source: Fishes of the Chesapeake Bay)
Bluefish (Pomatomus saltatrix): This sectioned bluefish otolith is 1 year old. The oldest bluefish aged by our surveys: ChesMMAP 2 years old, NEAMAP 5 years old.
Butterfish (Peprilus tricanthus) Otolith: are a pelagic schooling species, typically found over sandy bottoms in near shore and offshore waters. Maximum age suspected to be 6.
Butterfish (Peprilus triacanthus): This whole butterfish otolith is 2 years old.
Kingfish (Menticirrhus) Otolith: are members of the Sciaenidae family and are known to live for at least 4 years.
Kingfish (Menticirrhus): This sectioned kingfish otolith is 2 years old. The oldest kingfish aged by the ChesMMAP survey was 7 years old.
Red drum (Sciaenops ocellatus) Otolith : is an important recreational finfish that may travel in large schools. Red drum may live as long as 35 years.(Source: Fishes of the Chesapeake Bay)
Red drum (Sciaenops ocellatus): This sectioned red drum otolith is 8 years old. The largest red drum aged by the ChesMMAP survey was 30 years old.
Scup (Stenotomus chrysops) Otolith: are abundant fishes which prefer hard-bottom and submerged structures. Scup may attain 15 years of age (Source: Fishes of the Chesapeake Bay)
Scup (Stenotomus chrysops): This sectioned scup otolith is 9 years old. The oldest scup aged by our surveys: ChesMMAP 2 years old, NEAMAP 4 years old
Sheepshead (Archosargus probatocephalus) Otolith: prefer high-relief, hard-bottom areas. An excellent food fish that has been reported to live as long as 35 years. (Source: Old Dominion University's Center for Quantitative Fisheries Ecology)
Sheepshead (Archosargus probatocephalus): This sectioned sheepshead is 8 years old. The oldest sheepshead aged by the ChesMMAP survey was 26 years old.
Spot (Leiostomus xanthurus) Otolith: one of the Chesapeake Bay's most important commercial and recreational species. Spot have been reported to 6 years old. (Source: Old Dominion University's Center for Quantitative Fisheries Ecology)
Spot (Leiostomus xanthurus): This sectioned spot otolith is 1 year old. The oldest spot aged by the ChesMMAP survey was 4 years old.
Striped bass (Morone saxatilis) Otolith: Important recreational and commercial finfish. Females grow larger than males, and most fish older than 11 years are females, with ages exceeding 30 years reported.
Striped bass (Morone saxatilis): This sectioned striped bass otolith is 4 years old. The oldest striped bass aged by our surveys: ChesMMAP 20 years old, NEAMAP 21 years old
Summer flounder ( Paralichthys dentatus) Otolith: recreationally and commercially important flat fish. Excellent food fish. Known to live at least 12 years.
Summer flounder (Paralichthys dentatus): This sectioned summer flounder otolith is 3 years old. The oldest summer flounder aged by our surveys: ChesMMAP 12 years old, NEAMAP 13 years old
Weakfish (Cynoscion regalis) Otolith: a member of the family Sciaenidae that often occur in schools and frequent shallow, sandy bottom areas. Known to live at least 12 years. (Source: Fishes of the Chesapeake Bay and NEFSC)
Weakfish (Cynoscion regalis): This sectioned weakfish otolith is 2 years old. The oldest weakfish aged by our surveys: ChesMMAP 6 years old, NEAMAP 4 years old.
White perch (Morone americana) Otolith: a member of the family Moronidae. White perch are ubiquitous in estuaries and freshwater ecosystems. White perch may live as long as 17 years (Source: Fishes of the Chesapeake Bay)
White perch (Morone americana): This sectioned white perch otolith is 6 years old. The oldest white perch aged by the ChesMMAP survey was 17 years old.
Winter flounder (Pseudopleuronectes americanus) Otolith: the most common near-shore (shallow-water) flounder. Important U.S.commercial and recreational fisheries exist from the Gulf of Maine to the the Mid-Atlantic Bight. Winter flounder have been know to reach 15-20 years of age. (Source: NOAA NEFSC)
Winter flounder ( Pseudopleuronectes americanus): This sectioned winter flounder otolith is 3 years old. The oldest winter flounder aged by the NEAMAP survey was 19 years old.
Age and Growth
Appropriate hard parts for ageing (otoliths, vertebrae, or spines) are removed from each fish that is subsampled and brought back to VIMS for further anaylsis. Ageing structures are prepared according to methodology established by the NEFSC, Old Dominion University, and VIMS.
Typically, one otolith was selected and mounted on a piece of 100 weight paper with a thin layer of Crystal Bond. A thin transverse section was cut through the nucleus of the otolith, perpendicular to the sulcal groove, using two Buehler diamond wafering blades and a low speed Isomet saw. The resulting section was mounted on a glass slide and covered with Crystal Bond. If necessary, the sample was wet-sanded to an appropriate thickness before being covered. Some smaller, fragile otoliths were read whole. Both sectioned and whole otoliths were most commonly viewed using transmitted light under a dissecting microscope. Other structures such as vertebrae, opercles, and spines were processed and read using the standardized and accepted methodologies for each. For all hard parts, ages were assigned as the mode of three independent readings, one by each of three readers, and were adjusted as necessary to account for the timing of sample collection and mark formation.
The samples processed allow us to determine the age of the fish when it was caught. With this data, we can get a clear picture of the age structure of the population present in the Chesapeake Bay and Nearshore mid-Atlantic.
