Daily growth patterns of six species of young-of-the-year of Chilean intertidal fishes

Abstract

Otolith microstructure analysis was used to reveal daily growth patterns of young-of-the year (YOY) of six species of perciform fishes,Bovichtus chilensis(Bovichtidae),Girella laevifronsandGraus nigra(Kyphosidae),Helcogrammoides chilensis(Tripterygiidae) andHypsoblennius sordidusandScartichthys viridis(Blenniidae). YOY collected in intertidal pools from June to December 2008 in Central Chile, ranged from 24 to 76 mm total length and from 25 to 390 days of age. In the six species, sagittal otoliths showed a slightly oval shape, symmetrical and laterally compressed and showed micro-increments distinguishable after a two-side polishing. Increment width of sagittae showed two patterns irrespective of hatch month and species: (i) a parabolic growth with wider increment widths (during the first 150 of YOY life, e.g.B. chilensis,G. nigraandG. laevifrons); and (ii) a more irregular pattern with lower increment widths during most of the seasons inH. chilensisandH. sordidus. Further results were: (i) a unique central primordium enclosed by two checks after which distinctive increments were deposited; (ii) low instantaneous growth rates estimated through the slope of the length-at-age relationship (range 0.1–0.21 mm d−1); and (iii) a linear fish size–otolith size relationship.