New Zealand Journal of Marine and Freshwater Research abstracts
M99073Received 24 November 1999; accepted 30 June 2000
Comparison of daily increment formation pattern between sagittae and
lapilli of ling (Genypterus blacodes) larvae and juveniles collected
off Argentina
S. MORIOKA
INTEM Consulting Inc.
Office K 201 7-22-18
Nishi-shinjyuku
Shinjyuku-ku 160-0023
Tokyo, Japan
email: morioka@malawi.net
L. MACHINANDIARENA
National Institute for Fisheries Research
and Development
C.C.175, 7600 Mar del Plata
Argentina
Abstract Daily growth increments in sagittae and lapilli of
ling (
Genypterus blacodes (Schneider, 1801)) larvae and juveniles were
investigated. Increment counts of sagittae and lapilli of wild fish were
similar up to a length of c. 20 mm total length (TL) (~50 days old),
after which counts on sagittae were higher than for lapilli. Three individuals
were kept alive and treated with Alizarin Complexone to determine whether
increments formed on a daily basis. The number of increments visible in the
lapilli and sagittae after the mark was close to that expected in two of the
three fish. In the third fish, the agreement was good for the lapillus but the
number of increments on the sagittae was higher than expected. It is believed
that subdaily increments cause the overestimation of age in the sagittae.
Consequently, the lapillus is considered to be a better structure for daily
increment analysis than sagitta in larvae and juveniles of ling.
Keywords Genypterus blacodes; ling; sagittae; lapilli;
daily increments
New Zealand Journal of Marine and Freshwater Research, 2001, Vol. 35: 111-120
0028-8330/01/3501-0111 $7.00 (c) The Royal Society of New Zealand 2001
PDF file of entire paper: medium quality (2430K); (scanned from paper original: notes about this process)
This year's abstracts |
Journal home page |
All abstracts |
Publishing home page
