AGE AND GROWTH PROGRAM:
Total production figures were 31,573 with 10,816 test ages and 405 examined
and determined to be unageable.
Because a significant effort is being made in the Age and Growth Program
to develop ageing criteria for new species and species for which ageing
has been unsatisfactory, and validating ageing methods for species where
ageing criteria appear satisfactory, we report these readings under the
“special ages” category. Readings may be rereadings of the same specimens
for special comparisons. These special readings are for the calendar year 2003.
By Dan Kimura.
|
Estimated production figures for 1 January through 31 December 2003. |
|
Species |
Number Aged |
|
Species |
Number Aged |
|
Flathead sole |
634 |
Sablefish |
2,242 |
|
Rex sole |
181 |
Atka mackerel |
2,513 |
|
Alaska plaice |
367 |
Pacific ocean perch |
970 |
|
Northern rock sole |
1,026 |
Northern rockfish |
1,269 |
|
Yellowfin sole |
1,268 |
Harlequin rockfish |
644 |
|
Longheaded dab |
226 |
Light dusky rockfish |
602 |
|
Walleye pollock |
15,393 |
Dark dusky rockfish |
450 |
|
Pacific cod |
3,788 |
|
“Special Ages” read for 1 January through 31 December 2003. |
|
Species |
Number of Age Readings |
Purpose of Ageing |
|
Pacific cod |
481 |
Two cruises aged by break and burn and by toasting. |
|
Spectacled sculpin |
140 |
Noncommercial species. |
|
Greenland turbot |
442 |
Surface versus stained cross section comparisons.
Comparison of front and back ages of each otolith pair. |
|
White spotted brenadier |
89 |
Noncommercial species. |
|
Pacific ocean perch |
77 |
Re-ageing for C14 age validation. |
|
Skates |
213 |
Whole vertebra and section ages for Aleutian, Bering, Big, and Longnose skates. |
|
Shortraker rockfish |
718 |
Readings and rereadings of prominent and thin zones for comparison with radiometric ages. |
>>>continued
|
 |
quarterly Oct-Dec 2003 sidebar
AFSC Quarterly
Research Reports
Oct-Nov-Dec 2003
Contents
Feature
Auke Bay Lab
National Marine
Mammal Lab
RACE Division
REFM Division
Quarterly Index
Quarterly Home
|
