Age and growth studies of Gummy Shark, Mustelus antarcticus Gunther, and School Shark, Galeorhinus galeus (Linnaeus), from Souther Australian Waters

1992 ◽  
Vol 43 (5) ◽  
pp. 1241 ◽  
Author(s):  
PL Moulton ◽  
TI Walker ◽  
SR Saddlier
Keyword(s):  
South Australia ◽  
Growth Curves ◽  
Growth Patterns ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Fishing Mortality ◽  
Male And Female ◽  
Length Data ◽  
Von Bertalanffy Growth Equation ◽  
Galeorhinus Galeus

Age-length data were derived from counting stained bands on whole vertebral centra obtained from gummy shark, Mustelus antarcticus, captured by gill-nets during 1973-76 in Bass Strait and from gummy shark and school shark, Galeorhinus galeus, captured during 1986-87 in Bass Strait and waters off South Australia. The data were fitted to the von Bertalanffy growth equation after adopting the Francis reparametrization and correcting for sampling bias caused by the selectivity effects of the gill-nets of various mesh sizes used to capture the sharks. The von Bertalanffy growth curves of male and female gummy shark were significantly different, but the growth curves of male and female school shark were not. The growth curves suggest that growth rates of male and female gummy shark in Bass Strait were lower during 1986-87 than during 1973-76 and that the growth rates of male and female gummy shark and school shark in Bass Strait during 1986-87 were lower than those in South Australia at the same time. These apparent temporal and spatial differences in growth patterns of gummy shark are explained by the 'Phenomenon of Apparent Change in Growth Rate'. It is concluded that the growth curves determined for 1986-87 are distorted by the effects of a long history of high and length-selective fishing mortality and that actual growth patterns of gummy shark are better represented by the von Bertalanffy growth equation determined for shark caught in Bass Strait during 1973-76, when fishing mortality was much lower. Verification of age estimates was attempted by comparing von Bertalanffy growth curves derived from age-length data with those derived from tag release-recapture length-increment data, but these comparisons highlight the limitations of using tag data for this purpose. Although reasonable agreement was found between such growth curves for gummy shark, it appears that school shark older than 11 years cannot be aged accurately from stained whole or sectioned vertebrae. Sectioned vertebrae from a school shark recaptured 35.7 years after being tagged and released and calculated as having an age exceeding 45 years gave estimates of only 18-20 years of age.

BODY TEMPERATURE AFFECTS THE SHAPE OF AVIAN GROWTH CURVES

1993 ◽  
Vol 01 (04) ◽  
pp. 363-374 ◽  
Author(s):  
C. ZONNEVELD ◽  
S.A.L.M. KOOIJMAN
Keyword(s):  
Body Temperature ◽  
Growth Curve ◽  
Time Course ◽  
Growth Curves ◽  
The Body ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Gradual Development ◽  
Mathematical Equations ◽  
Von Bertalanffy Growth Equation

Growth of birds is described by a variety of mathematical equations. These equations generally lack a biological motivation. As a result, it remains unclear why growth in different species should be described by different equations. In this article, we argue that the gradual development of endothermy affects the growth of birds. Hence, differences in the growth curve may result from differences in the thermal ontogeny. We assume that birds would grow according to the von Bertalanffy growth equation, if their temperature were constant. Using the deviations from this growth curve, we reconstruct the time course of the temperature of growing birds. This reconstruction well describes data on the ontogeny of the body temperature in birds.

scholarly journals ASPEK BIOLOGI DAN PARAMETER PERTUMBUHAN IKAN LAYANG (Decapterus russelli, Rupell, 1928) DIPERAIRAN SELAT MALAKA

2019 ◽  
Vol 11 (3) ◽  
pp. 175
Author(s):  
Ria Faizah ◽  
Lilis Sadiyah
Keyword(s):  
Sex Ratio ◽  
Growth Parameter ◽  
Growth Patterns ◽  
Purse Seine ◽  
Maturation Stage ◽  
Gonad Maturation ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Male And Female ◽  
Fish Samples

Ikan Layang (Decapterus russelli, Rupell, 1928) merupakan salah satu ikan pelagis kecil bernilai ekonomis penting di perairan Selat Malaka. Ikan ini banyak tertangkap oleh alat tangkap purse seine. Tujuan penelitian ini adalah untuk mengetahui beberapa aspek biologi dan parameter pertumbuhan ikan Layang yang tertangkap purse seine di perairan Selat Malaka. Penelitian ini dilaksanakan selama bulan April hingga September 2016. Informasi yang disajikan oleh studi ini meliputi: hubungan panjang berat, faktor kondisi, rasio kelamin, tingkat kematangan gonad dan parameter pertumbuhan. Parameter pertumbuhan diperoleh dari data frekuensi panjang bulanan dan dianalisis dengan ELEFAN I dalam program FiSAT II, nisbah kelamin dianalisis menggunakan uji chi-kuadrat dan TKG ditentukan secara morfologi. Ikan Layang yang diperoleh selama penelitian sebanyak 958 ekor dengan kisaran ukuran antara 8,4-28,7 cmFL dan nisbah kelamin antara jantan dan betina yaitu 1:1,01. Pola pertumbuhan panjang-bobot ikan Layang jantan dan betina bersifat allometrik positif dengan mengikuti persamaan W=0,0057L3,2984 (R2=0,9745) untuk jantan dan W=0,0079L3,183 (R2=0,9825) untuk Layang betina. Kisaran faktor kondisi ikan Layang antara 0,97-1,67.Ikan Layang yang diamati mempunyai TKG I sampai dengan IV dengan nilai IKG 0,056– 6,36 % untuk ikan jantan dan 0.103 – 6,044 % untuk ikan betina. Persamaan kurva pertumbuhan Von Bertalanffy ikan Layang di Selat Malaka yaitu Lt =24,25 (1 - e 1,03(t+-0.163)) dengan panjang asimtotik (L∞) =24,25 cmFL, koefisien pertumbuhan (K) = 1,03 per tahun dengan umur teoritis (t0) = - 0,163. Ukuran rata-rata tertangkap (L50% = Lc) untuk ikan Layang adalah 16,21cmFL.Indianscad (Decapterus russelli, Rupell, 1928) is one of small pelagic fish that have economic values in The Malacca straits. This fish is caught by purse seine. The aim of this research were to assess several aspects of biolocal reproduction and growth parameter for Indianscad caught by purse seine in the Malacca straits. This research was conducted from April to September 2016. Information resulted from this study consisted of length weight relationship, condition factor, sex ratio, gonad maturation stage and growth parameter. Growth parameter used the ELEFAN I method by using FiSAT II software, sex ratio was analyzed using Chi-Square and gonad maturation stage by using morphology. This study used 958 fish samples with size between 8,4-28,7 cmFL and the sex ratio between male and female was 1:1,01. The growth patterns of Indian scad for male and female were negative allometric expressed by the following equation: W=0,0057L3,2984 (R2=0,9745) for male and W=0,0079L3,183 (R2=0,9825) for female. The condition factors were about 0,65-1,67.Indianscads observedranged between TKG I and TKG IV with IKG for male and female were 0.056– 6,36 % and 0.103 – 6,044 %, respectively. The Von Bertalanffy Growth Equation of Indian scad in Malacca straits was Lt =24,25 (1 - e 1,03(t+-0.163)) with the asymptotic length (L∞) =24,25 cmFL, growth coefficient (K) = 1,03 per year and the theoretical age (t0) Indian scad that was equal to (t0) = - 0,163. Length at first capture of Indian scad (Lc) was 16,21cmFL.

scholarly journals Population dynamic of Big Eye Scad (Selar crumenophthalmus Bloch, 1793) in Kwandang Waters-Sulawesi Sea

2020 ◽  
Vol 153 ◽  
pp. 01005
Author(s):  
Umi Chodrijah ◽  
Ria Faizah ◽  
Tirtadanu
Keyword(s):  
Average Length ◽  
Mortality Rates ◽  
Pelagic Fish ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Fishing Mortality ◽  
Small Pelagic Fish ◽  
Exploitation Rate ◽  
Capture Condition ◽  
Von Bertalanffy Growth Equation

Big eye scad (Selar crumenophthalmus) is one of important small pelagic fish which is exploited in Kwandang waters-Sulawesi Sea. The exploitation of this species has been increasing every year. This research was carried out to study the growth, mortality and exploitation of bigeye scad in the Kwandang waters during January-November 2016. The von Bertalanffy growth equation was derived as Lt = 25.95(1 - e 1,01(t+-0.16374)) with length between 14.9 -26.4 cm FL (average length 18,64 cm). The size at first capture (Lc) was estimated as 18.69 cm. The total, natural and fishing mortality rates were assessed as 4.28, 1.90 and 2.38 year−1, respectively. The exploitation rate (E) of 0.56 per year indicates that the degree of harvesting leads to a more capture condition.. The management that must be applied is to reduce fishing efforts to 12% of the current situation and to consider temporarily closing fishing activities (closing season).

Fitting the von Bertalanffy growth equation to polar bear age–weight data

1979 ◽  
Vol 57 (5) ◽  
pp. 1020-1025 ◽  
Author(s):  
Michael C. S. Kingsley
Keyword(s):  
Polar Bear ◽  
Canadian Arctic ◽  
Growth Curves ◽  
Simplex Algorithm ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Direct Minimization ◽  
Males And Females ◽  
Von Bertalanffy Growth Equation ◽  
Weight Data

Heavy sea ice in the Canadian Arctic in the winter of 1973–1974 reduced seal populations; polar bears, preying principally on seals, consequently lost weight. The nature and degree of this weight loss was investigated by examining the parameters of von Bertalanffy growth curves, fitted by direct minimization of a sum of squares using the simplex algorithm of Nelder and Mead. Growth rates were lower for both males and females tagged in 1974–1975 than for bears tagged in 1971–1973. Weights of mature bears were unaffected.

Growth, mortality and exploitation of bigeye scad, Selar crumenophthalmus off Mumbai, north-west coast of India

2015 ◽  
Vol 96 (7) ◽  
pp. 1411-1416 ◽  
Author(s):  
Debabrata Panda ◽  
A. K. Jaiswar ◽  
Soma Das Sarkar ◽  
S. K. Chakraborty
Keyword(s):  
West Coast ◽  
Performance Index ◽  
Single Pulse ◽  
Mortality Rates ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Fishing Mortality ◽  
North West ◽  
Second Year ◽  
Von Bertalanffy Growth Equation

An investigation was carried out to study the growth, mortality and exploitation of bigeye scad, Selar crumenophthalmus off the Mumbai coast during September 2008 to August 2009. The von Bertalanffy growth equation was derived as Lt = 310 mm [1−exp {−1.4 year−1 × (t−(−0.059 year))}] with the growth performance index (ø’) of 3.13. The fishable lifespan of the species was 2+ years in Mumbai waters. Bigeye scad attains total length of 240 and 293 mm during its first and second year of life. The size at first capture (Lc) was estimated as 240 mm (1+ year). The recruitment was continuous and throughout the year with a single pulse during August. Nearly 50% of the recruitment took place during August and September. The total, natural and fishing mortality rates were 4.62, 2.21 and 2.41 year−1, respectively. The estimated exploitation ratio (0.52) was very close to the optimum value of 0.5. Hence, the stock can be considered as optimally over-exploited in Mumbai waters.

Age, growth, and mortality of littlehead porgy, Calamus proridens, from southeast Florida coastal waters

2021 ◽  
Author(s):  
Michael L Burton ◽  
Jennifer C Potts ◽  
Ariel J Poholek ◽  
Jordan Page
Keyword(s):  
Coastal Waters ◽  
Southeastern United States ◽  
Fork Length ◽  
Total Mortality ◽  
Point Estimate ◽  
Growth Equation ◽  
Natural Mortality ◽  
Von Bertalanffy ◽  
Recreational Fisheries ◽  
Von Bertalanffy Growth Equation

Sectioned otoliths were used to age littlehead porgy Calamus proridens (n = 737) from southeastern Florida recreational fisheries. Otolith sections contained easily identifiable annuli and were reliable structures for aging littlehead porgy up to 11 yrs. Opaque zones were deposited from March to June (peaking in April). Littlehead porgy ranged from 1 to 11 yrs and 220 to 385 mm total length (TL). Body size relationships were TL = 1.09 FL + 16.06 (n = 3474, r2 = 0.95), FL = 0.87 TL – 1.15 (n = 3474, r2 = 0.95), W = 4.76 × 10 −5 TL2.80 (n = 6722, r2 = 0.86), and W = 1.2 × 10−4 FL2.71 (n = 3474, r2 = 0.90), where W is total weight (g) and FL is fork length (mm). Growth was not significantly different between two discrete geographic regions of Florida, and the von Bertalanffy growth equation was Lt = 335 (1 − e−0.41 (t + 2.13)) for all areas combined. The point estimate of natural mortality was M = 0.38, while age-specific estimates of M ranged from 0.60 to 0.41 yrs−1 for ages 1–11. Littlehead porgy were fully recruited to the headboat fishery by age-3 and catch curve analysis resulted in an estimate of total mortality Z = 1.08 for ages 3–7+. This study reports first estimates of life history parameters for littlehead porgy from Atlantic waters of the southeastern United States.

Good and bad fishing areas for Haliotis laevigata: A comparison of population parameters

1995 ◽  
Vol 46 (3) ◽  
pp. 591 ◽  
Author(s):  
FE Wells ◽  
P Mulvay
Keyword(s):  
Shell Length ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Population Parameters ◽  
Southern Coast ◽  
Close Inspection ◽  
Maximum Proportion ◽  
Males And Females ◽  
Von Bertalanffy Growth Equation ◽  
Mature Size

On the southern coast of Western Australia, proportionately more reproductive specimens of greenlip abalone, H. laevigata, were of legal size in 'good' fishing areas than in 'bad' fishing areas. Sex ratios were usually 1:1. Maturation of the gonads began at a size of 70-90 mm shell length (SL) and by 100-110 mm SL all animals were reproductively mature. Size-specific fecundities were not statistically different among the four good fishing areas examined, nor were they between the two bad fishing areas, but size-specific fecundity was greater in good than in bad fishing areas. Spawning begins as soon as the animals are mature; there is no gap between apparent histological maturity and actual spawning. Gonads are quiescent in the first part of the calendar year. Development is rapid in August and September, when animals begin to reach ripe condition. A maximum proportion of ripe animals occurs in October and November, followed by spawning in December. There was no difference between growth rates of males and females in either the good or the bad fishing areas. The von Bertalanffy growth equation disclosed no difference in growth between good and bad fishing areas, but close inspection of the data suggested that slower growth did occur in the bad fishing areas. The abalone reach reproductive maturity at an age of 2.5 to 3 years and the legal size of 140 mm SL at 5 to 6 years.

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