Measurement of Fish Scales and Back Calculation of Body Lengths Using a Digitizing Pad and Microcomputer

Frie, Richard V.

doi:10.1577/1548-8446(1982)007<0005:mofsab>2.0.co;2

Cited by 52 publications

(31 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Annuli were distinguished and counted to determine age. Growth rates of the Two Island Lake and Cloud Lake captured fish were determined by back-calculation using the DISBCAL program, an Apple I1 microcomputer, and a digitizing pad (Frie 1982).…”

Section: Methodsmentioning

confidence: 99%

Aspects of Smallmouth Bass,Micropterus dolomieui, Life History in Northwestern Ontario, Canada

Picard

Freitag

Iwachewski

1993

Journal of Freshwater Ecology

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 99%

Aspects of Smallmouth Bass,Micropterus dolomieui, Life History in Northwestern Ontario, Canada

Picard

Freitag

Iwachewski

1993

Journal of Freshwater Ecology

View full text Add to dashboard Cite

“…One pectoral spine was collected from each bullhead for age determinations. Ages of each bass and carp were determined through techniques described by Frie (1982). Ages of bullhead were determined by techniques described in Blouin and Hall (1990).…”

Section: Fish Sampling and Analysesmentioning

confidence: 99%

Polychlorinated biphenyls, mercury, and potential endocrine disruption in fish from the Hudson River, New York, USA

et al. 2006

View full text Add to dashboard Cite

Tissue residues of total mercury (Hg), total polychlorinated biphenyls (PCBs), and lipid-based PCBs; plasma concentrations of endocrine biomarkers; and reproductive and histologic biomarkers were assessed in 460 carp (Cyprinus carpio), bass (Micropterus salmoides and Micropterus dolomieui), and bullhead (Ameiurus nebulosus) collected from eight sites across the Hudson River Basin in the spring of 1998 to determine if endocrine disruption was evident in resident fish species and to evaluate contaminant-biomarker interrelations. Total PCBs in bed sediments (maximum 2,500 µg kg -1 ) could explain 64 to 90 % of the variability in lipidbased PCB residues in tissues (maximum 1,250 µg PCB g-lipid -1 ) of the four species. The 17b-estradiol to 11-ketotestosterone ratio, typically less than 1.0 in male fish and greater than 1.0 in females, exceeded 1.4 in all male largemouth bass and 35 % of male carp and bullhead at one site 21 km downstream from a major PCB source. Endocrine biomarkers were significantly correlated with total Hg in female smallmouth bass and carp, and with lipid-based PCBs in males of all four species. Empirical evidence of endocrine modulation in blood plasma of male and female fish from sites with and without high PCB residues in bed sediments and fish tissues suggest that PCBs, Hg, or other contaminants may disrupt normal endocrine function in fish of the Hudson River. * Corresponding author phone: +1 518 285 5605;

show abstract

“…Therefore, we chose the non-lethal assessment of age from scales. Mean backcalculated length at age and standard error were calculated using DISBCAL software (Frie 1982) assuming a direct proportion between body length and scale length. Mean backcalculated length at age was interpreted from scale impressions under the assumption that the Y-intercept (a) value for the body length-scale length relationship was 35 mm, as suggested by Carlander (1982).…”

Section: Introductionmentioning

confidence: 99%

Growth of Crappies in South Dakota Waters

Guy

Willis

1995

Journal of Freshwater Ecology

View full text Add to dashboard Cite

We obtained age-and-growth data from 34 black crappie (Pomoxis nigromaculatus) samples from 25 water bodies and nine white crappie (P. annularis) samples from four water bodies in South Dakota from 1990 through 1993. Mean backcalculated length for black crappie was significantly different among water body type [i.e., small impoundments ( c 40 ha), reservoirs (2 40 ha) and natural lakes] for all ages ( P I 0.01). Growth was slowest in small impoundments and fastest in natural lakes. Ultimate length (L,) was significantly correlated with mean back-calculated length at age ( P s 0.01). Mean length at time of capture varied monthly for white crappies. Age-2 white crappies completed 71% of their growth in length during July and August.

show abstract

Measurement of Fish Scales and Back Calculation of Body Lengths Using a Digitizing Pad and Microcomputer

Cited by 52 publications

References 0 publications

Aspects of Smallmouth Bass,Micropterus dolomieui, Life History in Northwestern Ontario, Canada

Aspects of Smallmouth Bass,Micropterus dolomieui, Life History in Northwestern Ontario, Canada

Polychlorinated biphenyls, mercury, and potential endocrine disruption in fish from the Hudson River, New York, USA

Growth of Crappies in South Dakota Waters

Contact Info

Product

Resources

About