An Integrated System for Production Fish Aging: Image Analysis and Quality Assurance

Morison, A. K.; Robertson, Simon; Smith, David C.

doi:10.1577/1548-8675(1998)018<0587:aisfpf>2.0.co;2

Cited by 77 publications

(65 citation statements)

References 19 publications

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“…We subsequently sought to validate age estimates from sectioned otoliths using more stringent validation procedures (Francis et al 1992;Francis 1995;Morrison et al 1998). Otoliths from recaptured fish in both streams were embedded in epoxy resin and sectioned transversely (0.60 mm width) through the nucleus along the dorso-ventral plane (Chilton and Beamish 1982).…”

Section: Sectioned Otolithsmentioning

confidence: 99%

Validation of scales and otoliths for estimating age of redband trout in high desert streams of Idaho

2010

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Studies validating aging structures for rainbow trout are sparse and none have been conducted for redband trout, a common western U.S. sub-species. Oxytetracycline mark-recapture methods (MR), marginal incremental analysis (MIA), and comparisons across multiple populations were used to evaluate the utility of two structures for aging redband trout in high desert streams. We assessed periodicity of annulus formation on scale and otolith samples from all age classes of trout residing in two streams, identified the location of the first annulus on otoliths, and compared age estimates and between-reader coefficient of variation on nine additional streams. The use of MIA successfully validated opaque zone periodicity for fish transitioning from age-0 to age-1, and from age 1 to age 2 in two streams. For fish at liberty 13 and 28 months in the same two streams, MR-derived age estimates from whole and sectioned otoliths were 94-100% accurate for fish from 2-9 years old. Scales were only 77% and 38% accurate for fish at liberty 13 and 28 months, respectively. Between-reader coefficient of variation (CV) for scales was high (11.5%), while CV for sectioned otoliths using whole otoliths as corroboratory structures averaged 2.3%. Scales were thus, an unacceptable aging structure for desert redband trout. Given the confusion in the literature, we suggest that more rigorous research should be conducted to define and explain otolith zone formation.

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Section: Sectioned Otolithsmentioning

confidence: 99%

Validation of scales and otoliths for estimating age of redband trout in high desert streams of Idaho

2010

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“…Increment widths were measured in sagittae (the largest set of otoliths) that had been embedded, sectioned to expose the innermost increments, and examined under transmitted light microscopy. Increments were measured with a digital image analysis system (11). The number of clearly ''readable'' increments that could be consistently measured in a species varied among them, from the interior-most two to five increments (corresponding to growth over the course of 2-5 years, respectively; Table 1), which delimited the juvenile period we were able to examine in each species.…”

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confidence: 99%

Depth-mediated reversal of the effects of climate change on long-term growth rates of exploited marine fish

Thresher

Koslow²,

Morison³

et al. 2007

Proc. Natl. Acad. Sci. U.S.A.

121

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The oceanographic consequences of climate change are increasingly well documented, but the biological impacts of this change on marine species much less so, in large part because of few long-term data sets. Using otolith analysis, we reconstructed historical changes in annual growth rates for the juveniles of eight long-lived fish species in the southwest Pacific, from as early as 1861. Six of the eight species show significant changes in growth rates during the last century, with the pattern differing systematically with depth. Increasing temperatures near the ocean surface correlate with increasing growth rates by species found in depths <250 m, whereas growth rates of deep-water (>1,000 m) species have declined substantially during the last century, which correlates with evidence of long-term cooling at these depths. The observations suggest that global climate change has enhanced some elements of productivity of the shallow-water stocks but also has reduced the productivity, and possibly the resilience, of the already slow-growing deep-water species.fisheries ͉ marine ecology ͉ oceanography

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“…Otolith weight in this study showed an inflexion point between 184 and 200 mm of TL, which seems to coincide with the length of sexual maturation of the tilapias. Morison et al (1998) mentioned an inflexion point in otolith weight at around the age of maturity. Despite the proven value of previous age determination studies of tilapia species using otoliths (Booth et al 1995, Booth and Merron 1996, Weyl and Hecht 1998, Admassu and Casselman 2000 opercula (Jiménez-Badillo 2004) and annuli in scales (Moreau 1971, Wosnitza-Mendo 1980, Yamaguchi et al 1990), these studies were performed on fish from the wild.…”

Section: Discussionmentioning

confidence: 99%

Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae)

Ibáñez¹,

Romo-Coronel²

2007

RBT

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Lake Metztitlán was dried up completely in the spring of 1998 and refilled in August of that year. In the period September-November, two cohorts of 1.6 million juveniles of a tilapia hybrid were stocked (Oreochromis aureus/O. niloticus), and monitored every month for one year. Since the date of birth of these juveniles was known, the analyses focused on whether the ring marks of the scales, sagittae and opercula or the circuli of the scales could be used to age them. The ring marks of the scales and opercula showed great variability, and the sagittae had a significant relationship with length, but it is unclear if at least the first ring mark could be formed at the hatchery and reflect changes in diet and/or tank movements in the fish farm. The circuli had a continuous regular behavior, with a formation rate of 10.38±0.93 and 11.38±0.95 circuli/month for the first and second cohorts, respectively. This proportion was maintained during the study period, and could be of help to calculate an approximate age of juveniles, especially in stocked fish that show multiple ring marks because of manipulation in fish farms and stocking events. Rev. Biol. Trop. 55 (3-4): 1005-1013. Epub 2007 December, 28.

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An Integrated System for Production Fish Aging: Image Analysis and Quality Assurance

Cited by 77 publications

References 19 publications

Validation of scales and otoliths for estimating age of redband trout in high desert streams of Idaho

Validation of scales and otoliths for estimating age of redband trout in high desert streams of Idaho

Depth-mediated reversal of the effects of climate change on long-term growth rates of exploited marine fish

Formation of ring marks in stocked tilapia juveniles (Oreochromis aureus/O. niloticus) (Perciformes: Cichlidae)

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