Age and growth of Australian grayling, Prototroctes maraena Gnnther (Salmoniformes : Prototroctidae), in the Tambo River, Victoria

1983 ◽  
Vol 34 (3) ◽  
pp. 451 ◽  
Author(s):  
TM Berra ◽  
PL Cadwallader
Keyword(s):  
Age Determination ◽  
Fork Length ◽  
Age And Growth ◽  
Scale Growth ◽  
Length Frequency ◽  
Age Classes ◽  
Frequency Distributions ◽  
Overall Ratio ◽  
The Relationship ◽  
Australian Grayling

The age and growth of Australian grayling were studied in 1203 individuals collected from the Tambo River, Victoria, between January and November 1979. Scales from 667 grayling were examined. The scale method of age determination was validated by the analysis of seasonal changes in the pattern of scale growth and by correspondence between ages inferred from length-frequency distributions and ages determined by scale readings. One annulus is formed on the scale by October. Most (88%) grayling belonged to the 1+ and 2+ age-classes; fish aged 3+ and 4+ made up 11% of the collection, and fish aged 5+ less than 1%. Size increased from January until May; growth ceased during winter and resumed in September. There was no difference in growth between the sexes. The largest grayling collected was a female of 253 mm fork length (Lf). The overall length-weight relationship was W = 2 715 × 10-6Lf3 2764. The relationship between total length (Lt) and Lf was Lt = 0.93 16 + 1.0742 Lf, and between standard length (Ls) and Lf was Ls = 0.8007 + 0.9095 Lf The overall ratio of males to females was 56 : 44.

Distribution, Age and Growth of Eastern Pacific Albacore (Thunnus alalunga Gmelin)

1955 ◽  
Vol 12 (1) ◽  
pp. 35-60 ◽  
Author(s):  
J. M. Partlo
Keyword(s):  
Average Length ◽  
Fork Length ◽  
Age And Growth ◽  
Frequency Distributions ◽  
Ring Number ◽  
Thunnus Alalunga ◽  
One Year ◽  
Relationship Of ◽  
The Relationship ◽  
Good Agreement

Seasonal and regional variations in the abundance of albacore during the 1949, 1950 and 1951 British Columbia fishing seasons suggest that exploitable stocks occurred in increasingly northerly areas during July and August and in more southerly areas during late August, September and early October. Catches were composed of four length-groups with average lengths of 54.3, 62.9, 71.7 and 81.9 centimetres. These groups were sometimes fairly discrete, but usually overlapped broadly, so that it was necessary to plot frequency distributions on probability paper in order to choose the best points of separation.Concentric marks on the centra of vertebrae were used as indicators of the age of the fish. The relationship of body length to vertebral radius is rectilinear. There is good agreement between the estimated average length and standard deviation in length of the fish when grouped by length and when grouped by vertebral ring number. The ages indicated for the four groups are III, IV, V and VI; however the first vertebral ring is somewhat less clear than the others and if it were discounted these ages would be reduced by one year. The fish whose vertebrae were examined had almost completed a year's growth.The length-weight relationship is expressed by the formula, log W = −4.912 + 3.13 log L, where W is the weight in kilograms and L is the fork length in centimetres.

Growth of the Pacific pomfret, Brama japonica: a comparison between otolith and length–frequency (MULTIFAN) analysis

1995 ◽  
Vol 52 (12) ◽  
pp. 2747-2756 ◽  
Author(s):  
Keith A. Bigelow ◽  
Juble T. Jones ◽  
Gerard T. DiNardo
Keyword(s):  
Fork Length ◽  
Growth Parameter ◽  
Age And Growth ◽  
Parameter Estimates ◽  
Cohort Model ◽  
Length Frequency ◽  
Spawning Period ◽  
Frequency Distributions ◽  
The North ◽  
The Pacific

Age and growth of the Pacific pomfret, Brama japonica, were independently estimated with presumed daily increments within otolith microstructure and MULTIFAN analysis of length–frequency distributions obtained from drift net fisheries. Likelihood ratio tests detected significant differences between sexes and geographic areas in von Bertalanffy parameter estimates from otolith analysis. Otolith interpretations indicated that the species is short lived (age 3+), fast growing (growth coefficient (K) > 1.1), and fully recruited to the North Pacific squid drift net fishery at < 1 yr old. Back-calculated hatching dates indicate a protracted spawning period. MULTIFAN models fit the length–frequency data with an assumption of both annual and biannual recruitment. Growth parameter estimates were asymptotic fork length (FL∞) = 49.9 cm, K = 0.57 for an annual cohort model, and FL∞ = 49.4 cm, K = 1.0 for a biannual cohort model. The growth model derived from otolith increment counts is closer to the MULTIFAN model that assumes biannual length–frequency modes, rather than annual modes.

Age and growth pattern of the thin-lipped mullet Liza Ramada in the Eastern coast of Libya.

2016 ◽  
Vol 5 (06) ◽  
pp. 4620
Author(s):  
Manal M. Khalifa ◽  
Ramadan A. S. Ali ◽  
Abdalla N. Elawad* ◽  
Mohammad El. ElMor
Keyword(s):  
Frequency Distribution ◽  
Age Groups ◽  
Age Determination ◽  
Age And Growth ◽  
Eastern Coast ◽  
Growth Equation ◽  
Length Frequency Distribution ◽  
Length Frequency ◽  
Scale Reading ◽  
Von Bertalanffy Growth Equation

Age and growth characteristics of the thin-lipped Grey Mullet (Liza ramada) were investigated in Eastern coast of Libya. Aging was done by two methods: counting annuli on scales and by length frequency distribution, a total of 218 scales were studied for age determination, in addition of 334 fishes specimen for length frequency distribution reading. Four age groups were determined from scale reading, and five age groups from length frequency distribution methods, the parameters of the Von Bertalanffy growth equation for both sex of all individuals were estimated at 35.4 cm, 0.187 per year, -1.14 years and 2.4, for male were estimated at 35.7 cm, 0.17 per year, -1.367 and 2.3, for female were 38.6 cm, 0.156 per year, -1.383 and 2.4, for L∞, k and t0, and φ′, respectively.

Size Distributions and Growth of the Fan-shell Pinna bicolor Gmelin (Mollusca : Eulamellibranchia) in South Australia

1979 ◽  
Vol 30 (1) ◽  
pp. 25 ◽  
Author(s):  
AJ Butler ◽  
FJ Brewster
Keyword(s):  
South Australia ◽  
Adductor Muscle ◽  
Size Distributions ◽  
Limited Data ◽  
Length Frequency ◽  
Age Classes ◽  
Frequency Distributions ◽  
Growth And Survival ◽  
Random Samples ◽  
Variable Success

Fourteen random samples of Pinna bicolor were collected over a period of 31 months from 6 m depth in Gulf St Vincent off Edithburgh, South Australia. The length-frequency distributions suggest that: P. bicolor larvae settle in spring but with variable success; growth of newly settled young is rapid over summer; by age 1 year their modal shell length is about 20 cm; by age 2 it is about 26 cm; they may survive substantially longer than 3 years so that a length-class of mode c. 35 cm is always present and is composed of several age-classes not necessarily equally represented. These suggestions are corroborated by limited data on adductor muscle scars, the development of epibiota on the shells, and the growth and survival of tagged animals over 9 months.

Application of the otolith weight – age relationship for the pilchard, Sardinops sagax neopilchardus

1995 ◽  
Vol 52 (4) ◽  
pp. 657-664 ◽  
Author(s):  
W. J. Fletcher
Keyword(s):  
Maximum Size ◽  
Steady Increase ◽  
Average Weight ◽  
Fish Length ◽  
Natural Mortality ◽  
Length Frequency ◽  
Age Classes ◽  
Frequency Distributions ◽  
Southwestern Australia ◽  
Sardinops Sagax

Adult pilchard (Sardinops sagax neopilchardus) from southwestern Australia held in fish cages for 1 year showed minimal increase in mean length but a steady increase in mean otolith weight (1.61–1.83 mg); this increase (0.22 mg) closely parallels the previously calculated mean difference between adjacent age classes (0.24 mg). Modes in otolith weight frequency distributions of fishery-caught pilchards, previously suggested as corresponding with separate year classes, generally persisted and progressed through subsequent samples. By contrast, fish length frequency distributions of these samples showed no consistent modal progression. The average weight of otoliths for year classes 2–8 were used to calculate growth rates: following sexual maturity, at age 2, males grew to a significantly smaller maximum size than females (L∞ = 162 and 172 mm respectively). The otolith weight – age relationship, validated by following a cohort of unusually low abundance as it moved through the fishery, indicated that recruitment to the fishery generally began at age 2 but was not complete until age 4. These data have been successfully used in forecasting the catch rate of the fishery up to 2 years in advance and providing an estimate of the rate for natural mortality of 0.43.

Age and growth of the squid Todaropsis eblanae (Cephalopoda: Ommastrephidae) on the north-west African shelf

2000 ◽  
Vol 80 (4) ◽  
pp. 747-748 ◽  
Author(s):  
Alexander I. Arkhipkin ◽  
Vladimir V. Laptikhovsky
Keyword(s):  
High Growth ◽  
West African ◽  
Age And Growth ◽  
Length Frequency ◽  
Annual Life Cycle ◽  
Frequency Distributions ◽  
North West ◽  
The North ◽  
West African Coast ◽  
African Coast

Length composition, maturation and growth of the ommastrephid squid Todaropsis eblanae were studied using length–frequency distributions (LFDs) and statoliths of squid caught off the north-west African coast. Length–frequency distributions were quite similar in all seasons studied, indicating all year round spawning. However, both high proportions of mature squid in the winter and the hatching peak of squid from our sample in spring suggested the winter–spring peak of spawning. Immature and maturing squid had rather high growth rates, attaining 140—150 mm of dorsal mantle length (ML) by the age of 160—170 d. Todaropsis eblanae is likely to have an annual life cycle on the north-west African shelf.

Age and stock structure of gemfish (Rexea solandri) in New Zealand waters

1999 ◽  
Vol 50 (2) ◽  
pp. 103 ◽  
Author(s):  
P. L. Horn ◽  
R. J. Hurst
Keyword(s):  
Growth Parameters ◽  
Age Determination ◽  
Natural Mortality ◽  
Stock Structure ◽  
Von Bertalanffy ◽  
Length Frequency ◽  
Frequency Distributions ◽  
The North ◽  
Spawning Areas

Age determination of gemfish by counting hyaline zones in otoliths was validated by following the progression of modes in length–frequency distributions and the progression of strong and weak year classes in age–frequency distributions. Length–frequency and otolith samples were examined from four areas (west Northland, east Northland and Bay of Plenty, Wairarapa coast, and the Stewart- Snares shelf). Age–frequency distributions and von Bertalanffy growth parameters were calculated and compared between areas. Two gemfish stocks are indicated on the basis of patterns of year class strengths, trends in commercial landings and likely spawning areas; one off the east and north of the North Island, and another off the west and south of the South Island. Estimates of natural mortality are presented for the two stocks.

Age and Growth of Dogfish Squalus acanthias in British Columbia Waters

1975 ◽  
Vol 32 (1) ◽  
pp. 43-59 ◽  
Author(s):  
K. S. Ketchen
Keyword(s):  
British Columbia ◽  
Growth Curve ◽  
Squalus Acanthias ◽  
Age And Growth ◽  
Von Bertalanffy ◽  
Large Fish ◽  
Length Frequency ◽  
Strait Of Georgia ◽  
Frequency Distributions ◽  
Net Uptake

Ages of dogfish have been determined from markings on the second dorsal spine by a technique that enables use of badly worn spines from relatively large fish to correct for the tendency to underestimate age. While the technique may have led to slight overestimation of age, particularly of dogfish from Hecate Strait, there is some corroborating evidence for the Strait of Georgia drawn from length-frequency distributions, sizes of fish in relation to reproductive stages, and assumptions about the average annual net uptake of mercury. It is tentatively concluded that the growth curve for females, expressed in terms of the von Bertalanffy equation, has parameters of K = 0.048, [Formula: see text], and t0 = −4.88 yr. Parameters suggested for males are: K = 0.070, [Formula: see text], and t0 = −4.70 yr. The implication emerging from these results is that females and males on the average take 23 yr and 14 yr, respectively, to reach maturity.

Age and growth of two commercially imported sharks (Carcharhinus tilstoni and C. sorrah) from Northern Australia

1988 ◽  
Vol 39 (4) ◽  
pp. 417 ◽  
Author(s):  
S Davenport ◽  
JD Stevens
Keyword(s):  
Growth Parameters ◽  
Age And Growth ◽  
First Year ◽  
Shark Species ◽  
Von Bertalanffy ◽  
Northern Australia ◽  
Length Frequency ◽  
Frequency Distributions ◽  
Gill Net ◽  
First Year Of Life

The age and growth of Carcharhinus tilstoni and C. sorrah, the two most abundant shark species in commercial gill-net catches off northern Australia, were investigated by the examination of vertebral rings. Corroborating evidence for age and growth estimates was obtained from length-frequency distributions and tag-recapture data. To aid validation of these estimates, tetracycline was injected into sharks at the time of tagging. Growth is relatively rapid in the first year of life: vertebral ageing indicated 17 cm growth in total length (TL) for C. tilstoni and about 20 cm for C. sorrah during the first year after birth. By the time the sharks are 5 years old, growth has declined to 8-10 cm per year in C. tilsoni and 5 cm per year or less in C. sorrah. The von Bertalanffy growth parameters for C. tilstoni are L∞ = 194.2, K = 0.14, t0 = -2.8 for females, and L∞ = 165.4, K = 0.19, t0 = -2.6 for males; for C. sorrah the parameters are L∞ = 123.9, K = 0.34, t0 = -1.9 for females, and L∞ = 98.4, K = 1.17, t0 = -0.6 for males. The greatest recorded ages for C. tilstoni were 12 years for females and 8 years for males, and for C. sorrah, 7 years for females and 5 years for males. Sexual maturity is reached early: at 3 to 4 years in C. tilstoni and 2 to 3 years in female C. sorrah.

Age and Growth of the Shortfin Mako, Isurus oxyrinchus, Using Four Methods

1983 ◽  
Vol 40 (11) ◽  
pp. 1944-1957 ◽  
Author(s):  
Harold L. Pratt Jr. ◽  
John G. Casey
Keyword(s):  
Growth Rate ◽  
Full Range ◽  
Fork Length ◽  
Growth Function ◽  
Temporal Analysis ◽  
Age And Growth ◽  
Length Frequency ◽  
Isurus Oxyrinchus ◽  
Shortfin Mako ◽  
Age Estimates

Age and growth rate of shortfin mako, Isurus oxyrinchus, captured by hook and line between 1961 and 1981 were determined using four methods: (1) temporal analysis of length–month information, (2) results of tagging data, (3) length–frequency analysis, and (4) ring counts on vertebrae. A temporal analysis of length–month information relating size to age for individuals less than 150 cm fork length (FL) was used to determine size (60–70 cm FL), time of birth (late spring), and early growth rate (50 cm/yr for ages 0–I, 32 cm/yr for ages I–II). This growth rate was used as a basis for interpreting the accuracy of other methods. Annual growth rates were calculated from 32 tag–recaptured mako sharks and resolved graphically into a growth curve. Length–frequency modes extended age estimates to intermediate-sized makos. Counts of growth rings on vertebral centra stained with silver nitrate were employed to back-calculate lengths at ages for the full range (69–328 cm). Our interpretation was based on the hypothesis that two rings are formed on the centrum each year; these age estimates agreed well with results from other methods. Males and females had a similar growth rate even though females grow much larger than males. The oldest female in the sample was 11.5 yr at 328 cm. The oldest male was 4.5 yr at 225 cm. The von Bertalanffy asymptotic growth function adequately described shortfin mako growth: male L∞ = 302 cm, K = 0.266, t0 = −1; female L∞ = 345 cm, K = 0.203, t0 = −1.

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