scholarly journals Growth analysis of chub, Leuciscus cephalus (L.), and dace, Leuciscus leuciscus (L.), in the Úpoř stream using growth data of recaptured marked fish

2011 ◽  
Vol 50 (No. 7) ◽  
pp. 329-339 ◽  
Author(s):  
P. Vlach ◽  
J. Dušek ◽  
M. Švátora ◽  
P. Moravec
Keyword(s):  
Growth Rate ◽  
Age Groups ◽  
Growth Equation ◽  
Growth Data ◽  
Average Value ◽  
Slowing Down ◽  
Length Growth ◽  
Weight Relationship ◽  
Average Condition ◽  
The Mean

The length growth of chub and dace was observed. The scale method was used as well as data gained from recaptured individuals which were marked with visible elastomer tags and platinum wire tags with a coloured code placed under the first bony ray of the dorsal fin. The length-weight relationship for chub could be explained by the equation w = 0.00001.l <sup>3.067</sup> (r<sup>2</sup> = 0.96). The average condition coefficient reached 1.49. The growth was balanced, gradually slowing down. Von Bertallanffy growth equation had the form L<sub>t </sub>= 245.47(1 &ndash; e<sup>&ndash;0.206(t + 0.0333)</sup>). The average value of instantaneous monthly growth rate (G<sub>m</sub>) ranged between 0.4 and 4.3 (in %). Mean G<sub>m</sub> of particular age groups gradually decreased. G<sub>m</sub> varied seasonally, annually and in different parts of the stream. The length-weight relationship for dace was w = 0.000009.1<sup>3.0948 </sup>(r<sup>2</sup> = 0.97). The mean condition coefficient reached the value of 1.11. The length growth was balanced, gradually decreasing. Von Bertallanffy equation had the form L<sub>t</sub> = 216.28(1 &ndash; e<sup>&ndash;0.2536(t + 0.26094)</sup>). The instantaneous monthly growth rate ranged between &ndash;1.57 and 10.38 (in percentage). This indicator fluctuated according to the age, season and year. &nbsp;

Studies on southern Australian abalone (Genus Haliotis). IV. Growth of H. laevigata and H. ruber

1983 ◽  
Vol 34 (3) ◽  
pp. 461 ◽  
Author(s):  
SA Shepherd ◽  
WS Hearn
Keyword(s):  
Growth Rate ◽  
Average Rate ◽  
South Australia ◽  
Annual Growth ◽  
First Year ◽  
Growth Equation ◽  
Annual Growth Rate ◽  
Growth Data ◽  
Differential Growth ◽  
Frequency Distributions

The growth of H. laevigata Donovan and H. ruber Leach was studied at several sites in South Australia by fitting the von Bertalanffy growth equation to growth data, supplemented by analysis of length- frequency distributions. Juvenile individuals of H. laevigata grow at an average rate of 0.9 mm per week, reaching a length of about 40 mm in 1 year at West Island; at Waterloo Bay H. laevigata can reach a length of 50 mm in the first year. After the first year, the annual growth coefficient (K) and the asymptotic length (L∞) for the two species at three sites are, respectively: H. laevigata-0.48 year-1 and 138 mm (West I.); 0.41 year-1 and 131 mm (Tipara Reef); 0.59 year-1 and 148 mm (Waterloo Bay); H, ruber-0 34 year-1 and 139 mm (West I.); 0.32 year-1 and 143 mm (Tipara Reef); 0 41 year-1 and 144 mm (Waterloo Bay). There are also seasonal differences in growth rate between species and between sites. These differences as well as differences in the annual growth rate within a species between sites are associated predominantly with differences in the food supply. There is differential growth between the sexes of H. laevigata at Waterloo Bay, where females grow 25% faster than males and reach a larger size.

The biology of Calocaris macandreae [Crustacea: Thalassinidea]

1963 ◽  
Vol 43 (3) ◽  
pp. 729-747 ◽  
Author(s):  
John B. Buchanan
Keyword(s):  
Growth Rate ◽  
Survival Curve ◽  
Age Groups ◽  
Larval Survival ◽  
Egg Laying ◽  
Moult Cycle ◽  
Size Frequency Distribution ◽  
Apparent Lack ◽  
Slowing Down ◽  
Population Numbers

Previous work on the biology and distribution of Calocaris is discussed briefly. The distribution in Northumberland waters is considered in relation to depth and bottom sediment.Quantitative monthly samples show that population numbers remain very stable throughout the year. A well marked egg-laying period occurs in January-February when relatively few eggs (average 38) are attached to the pleopods. Eggs are carried for 8–9 months and hatch in September-October. By a combination of size-frequency distribution and gonad-developmnt classification the age-groups in the population are interpreted. After passing through a phase of testes development and spermatophore formation individuals lay their first batch of eggs at the end of the 5th year. The ovaries regenerate over a 2-year period and a second egg-laying takes place at the end of the 7th year with a possible third at the end of the 9th year. The incidence of soft individuals in the samples together with observed changes in the coverage with epifaunistic growths indicate that after entering the 5th year a single annual moult cycle begins with a slowing down in growth rate.Population numbers, fecundity and larval survival are discussed. Both the survival curve and the apparent lack of serious predation suggest that the population reaches senescence

Two-year tree growth patterns investigated from monthly girth records using dendrometer bands in a wet evergreen forest in India

2000 ◽  
Vol 16 (3) ◽  
pp. 429-446 ◽  
Author(s):  
Raphaël Pélissier ◽  
Jean-pierre Pascal
Keyword(s):  
Growth Rate ◽  
Tree Growth ◽  
Growth Patterns ◽  
Annual Growth ◽  
Evergreen Forest ◽  
Annual Growth Rate ◽  
Growth Data ◽  
Growth Profiles ◽  
Dendrometer Bands ◽  
The Mean

With the aim of characterizing tree growth patterns, this paper re-examines the growth data of 100 selected trees belonging to 24 species that were recorded monthly in a 0.2-ha plot of a wet evergreen forest in the Western Ghats of India during the period 1980–82 using dendrometer bands. The mean growth profile, combining all of the selected trees, showed: (a) a significantly lower annual growth rate during the second year of survey which seemed to be negatively related to monsoon precipitation; (b) significant intra-annual growth variation clearly related to the regular alternation between a period of heavy rain and a quite long dry season of the monsoon climatic regime. Analysis of the variability of the individual smoothed growth profiles representing the 2-y trend of the growth data showed that: (a) the mean growth rate depended on a combination of an intrinsic endogenous variable (the structural class grouping species according to their maximum size), a tree size variable (tree diameter at breast height, dbh) and a neighbourhood variable (the number of taller neighbours in a 10-m radius); (b) the sudden change in growth rate from one year to the other was not predictable using these variables. The amplitude of the seasonal variations, investigated from the detrended growth profiles, appeared to be dependent on a combination of tree dbh and the number of taller neighbours in a 10-m radius. A co-inertia analysis of the smoothed and the detrended growth profiles indicated that the trees with fast growth also exhibited high seasonal variation. It is suggested that fast growing trees are those with favourable crown positions, which are consequently subject to high transpiration rates due to radiation and wind exposure.

scholarly journals Growth parameters of Poecilia latipinna (Lesueur, 1821) (Actinopterygii, Poeciilidae) – an introduced species in brackish water of Wadi Al-Bahayes (Oman)

2021 ◽  
Vol 50 (3) ◽  
pp. 269-277
Author(s):  
Salim Serkan Güçlü ◽  
Saud M. Al Jufaili ◽  
Laith A. Jawad
Keyword(s):  
Growth Performance ◽  
Alien Species ◽  
Condition Factor ◽  
Growth Parameters ◽  
Growth Equation ◽  
Von Bertalanffy ◽  
Poecilia Latipinna ◽  
Weight Relationship ◽  
The Mean ◽  
Von Bertalanffy Growth Equation

Abstract This work is one of the first studies on the growth of Poecilia latipinna outside its natural habitat. The objective of our study was to investigate the growth parameters of the population of P. latipinna, which is an alien species in Oman (Wadi Al-Bahayes). The population structure of P. latipinna in Wadi Al-Bahayes (Oman; 23°40′47″N; 58°11′36″E) was studied in June and August 2020, using 124 fish. In the course of this study, the number of individuals of each sex, age, weight and size composition were determined. In addition, the total length–weight relationship (LRW) was calculated, as well as the von Bertalanffy growth equation. The mean growth performance (phi prime) and the condition factor were calculated. Males accounted for 37.10% and females for 62.90% of the population. The length–weight relationship and the von Bertalanffy growth equation were W = 0.0214 × L 2.7889 R2 = 0.9212, Lt = 11.46 (1 − e −0.127 (t + 2.71)) for males and Lt = 14.51 (1 − e−0.072 (t + 3.98)) for females. The mean growth performance and the condition factor were calculated as 1.22 for males and 1.18 for females and 1.54 for all specimens. The study shows that the population of the species is characterized by a wide age range. Consequently, monitoring of this alien species is highly recommended.

Age, Growth and Sexual Maturity of Cod (Gadus morhua L.) in the Newfoundland Area, 1947–1950

1960 ◽  
Vol 17 (6) ◽  
pp. 775-809 ◽  
Author(s):  
A. M. Fleming
Keyword(s):  
Growth Rate ◽  
West Coast ◽  
Sexual Maturity ◽  
Gadus Morhua ◽  
East Coast ◽  
Age Groups ◽  
Early Summer ◽  
Growth Data ◽  
Southwestern Part ◽  
Northeastern Part

Samples of cod were collected from fishing gears in the coastal areas of Newfoundland and Labrador and from research otter-trawlers on the neighbouring banks from 1947 to 1950. Collections for the most part were from early summer to early autumn. Ages were determined using otoliths. Calculations of growth were based on average lengths and weights of the different age-groups in the samples.The growth rates of cod from various parts of the area were found to differ widely. Labrador cod had the slowest growth rate, much slower than cod from other parts of the area. Cod from the east coast of Newfoundland and the northeastern part of the Grand Bank were also slow-growing. Cod from the southwestern part of the Grand Bank had the fastest growth rate. Though cod from St. Pierre Bank and southwestern Newfoundland were fast-growing, also, they exhibited a somewhat slower growth rate than those from the southwestern part of the Grand Bank. Cod from the west coast of Newfoundland grew faster than cod from the east coast, but slower than those from southwestern Newfoundland.Though differences in growth rate were small between the sexes, the females generally grew at a slightly faster rate.The influence of differences in temperature and in food supply on the growth of cod in the area is discussed.Comparable growth data for the area published by several investigators are discussed. It is suggested that differences in these data were the result of variation in sampling locality, different sampling gears, different combination of individual samples and differences in age estimation.Both the size and age at which all fish were sexually mature varied throughout the area of investigation. Labrador cod matured at an earlier age and smaller size than cod from other parts of the area, whereas cod from the southwestern part of the Grand Bank generally matured at a later age and larger size than cod from other parts of the area. Cod from the east coast of Newfoundland, the northeastern part of the Grand Bank, St. Pierre Bank and the southwest and west coasts of Newfoundland were intermediate between cod from Labrador and the southwestern part of the Grand Bank in age and size at maturity, fish from the east coast generally maturing at an earlier age and smaller size than fish to the south on the Grand Bank and St. Pierre Bank and from the southwest and west coasts.The age, growth and sexual maturity relationships of cod from various parts of the area, when analyzed in the light of tagging experiments, meristic studies, parasite studies and hydrographic information, suggest the existence of at least four relatively distinct divisions in the cod population of the area, between which there is only limited intermingling. These are the Labrador, the Newfoundland east coast, the southern Grand Bank and the Newfoundland west coast divisions, with areas such as St. Pierre Bank and the Strait of Belle Isle being mixing areas of cod from adjacent divisions.

scholarly journals Growth characteristics of fish species Gerres filamentosus (Cuvier, 1829) in coastal zone, Quang Binh province

2014 ◽  
Vol 6 (3) ◽  
pp. 184-187
Author(s):  
Van Thiep Vo ◽  
Thi Yen Tran ◽  
Thi Huong Binh Nguyen ◽  
Ngoc Tam Huynh
Keyword(s):  
Growth Rate ◽  
Age Structure ◽  
Coastal Area ◽  
Age Groups ◽  
Growth Characteristics ◽  
Growth Equation ◽  
Annual Growth Rate ◽  
Von Bertalanffy ◽  
Study Results ◽  
Fish Samples

The research was conducted from October 2013 to March 2014 by using the method applied in the current ichthyology study by GV Nikolski, Pravdin IF, OF Xakun, NA Buskaia and Mai Dinh Yen. Fish samples were collected in the coastal area of Quang Binh province. The study results showed that Gerres filamentosus (Cuvier, 1829) had the length romf 52mm to 230mm, corresponding to the weight from 4g to 185g. The age structure of the fish was simple that consisted of four age groups (0+ - 3+), the annual growth rate was relatively fast, the growth equation following Von Bertalanffy was as: Lt = 234.4 x [1- e-0.35 (t + 0.996)], Wt = 373.4 x [1-e-0.0244 (t + 0.2388)] 3.0676. Nghiên cứu được thực hiện từ tháng 10 năm 2013 đến tháng 3 năm 2014 bằng những phương pháp đang được áp dụng trong các nghiên cứu ngư loại hiện nay của G.V. Nikolski, I. F. Pravdin, O. F. Xakun, N. A. Buskaia và Mai Đình Yên, mẫu cá được thu tại vùng ven biển của tỉnh Quảng Bình. Kết quả nghiên cứu đã cho thấy cá Móm gai dài có chiều dài dao động từ 52mm – 230mm, tương ứng với khối lượng từ 4g – 185g. Cấu trúc tuổi cá Móm gai dài đơn giản, gồm 4 nhóm tuổi (0+ - 3+), tốc độ tăng trưởng hàng năm tương đối nhanh, phương trình sinh trưởng theo Von Bertalanffy có dạng Lt = 234,4 x [1-e-0,35(t + 0,996)], Wt = 373,4 x [1-e-0,0244(t + 0,2388)]3,0676.

scholarly journals The value of Gissane's angle in the population of central Serbia

2021 ◽  
pp. 15-15
Author(s):  
Milan Kovacevic ◽  
Ivona Bankovic ◽  
Milan Aksic ◽  
Jovan Rakic ◽  
Aleksandar Radunovic ◽  
...  
Keyword(s):  
Normal Values ◽  
Age Groups ◽  
Mean Value ◽  
Age Group ◽  
Average Value ◽  
Diagnosis And Prognosis ◽  
Wide Range ◽  
The Mean ◽  
Heel Fractures ◽  
And Gender

Background / Aim. Determining the value of Gissane?s angle (GA) plays a role in diagnosis and prognosis of heel fractures, determining treatment methods and assessing the outcome of surgical treatment. Normal values of the GA vary in relation to ethnicity, age and gender of the examined group, which indicates its anthropometric significance. The aim of this study was to determine the range of normal GA values in the population of Central Serbia. Methods. GA was determined on lateral radiography of the foot of 145 subjects, both sexes (67 women and 78 men), with subjects divided into 6 age groups. The patients included in the study did not have a calcaneus fracture. The obtained results were processed in the Graph Pad program. Results: The average value of GA in Serbia was 110.8? ? 8.1, ranging from 93? to 132.9?. The mean value of GA decreased with age, and no difference was observed between women and men, except in the youngest age group were women had higher GA values than men. Conclusion. The results of the study showed a wide range of normal GA values, as well as the existence of a difference in subjects of different age and sex.

LA CROISSANCE EN LONGUEUR ET EN POIDS DES AMIA CALVA L. DE LA RÉGION DE MONTRÉAL

1967 ◽  
Vol 45 (5) ◽  
pp. 797-804 ◽  
Author(s):  
Denis Cartier ◽  
Étienne Magnin
Keyword(s):  
Growth Rate ◽  
Life Span ◽  
Age Groups ◽  
Maximum Length ◽  
Log P ◽  
Age Group ◽  
Back Calculation ◽  
The Mean ◽  
Logarithmic Equation ◽  
Amia Calva

The age of 80 bowfins (Amia calva L.) from the Montreal area has been read from the scales, the gular plate, and the otoliths. Both sexes have the same growth rate. The growth in length of all specimens collected can be summarized in one logarithmic equation: log L = 2.35137 + 0.54922 log A, where L is the total length (in mm) and A the age group. All the age groups can then be described by a particular measured mean length and also by a back-calculated mean length. The ponderal growth is obtained first from the mean weight of different classes, and then from the length–weight relation: log P = −4.961 + 2.992 log L, in which P is the weight (in g) and L the mean length (in mm) determined by back calculation. Maximum length and weight recorded were 870 mm and 6800 g respectively; a 12-year life span seems to be rarely exceeded. The results are compared with those available in the literature.

scholarly journals GROWTH AND SURVIVAL RATE OF VANAME SHRIMP (Litopenaeus vannamei) PL-10 ON DIFFERENT STOCKING DENSITY

AQUASAINS ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 903
Author(s):  
Pratiwi Pratiwi ◽  
Muhammad Marzuki ◽  
Bagus Dwi Hari Setyono
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Litopenaeus Vannamei ◽  
Economic Value ◽  
Stocking Density ◽  
Market Demand ◽  
Daily Growth ◽  
Average Value ◽  
Length Growth ◽  
Shrimp Cultivation

Litopenaeus vannamei is a commercial shrimp that has high economic value. In recent years, the main commodity contributing to the aquaculture sector in Indonesia is vaname shrimp. Vaname shrimp cultivation aims to meet the increasing market demand. One of the factors that influence the success of vaname shrimp cultivation is the stocking density. This study aims to determine the growth and viability of PL-10 vaname shrimp (Litopenaeus vannamei) fry at different stocking densities. This study used a completely randomized design (CRD). There were 4 treatments, namely P1 with a stocking density of 75 heads / 40 liters, P2 with a stocking density of 150 heads / 40 liters, P3 with a stocking density of 225 heads / 40 liters, and P4 with a stocking density of 300 heads / 40 liters, respectively. 4 repetitions. The research data were analyzed using statistical analysis Univariate One Way Analysis of Variance at 5% level with a 95% confidence interval. The results showed that the highest daily growth rate was obtained in treatment P1 with an average value of 26.836 ± 0.745% / day, the highest daily length growth rate was obtained in treatment P1 with an average value of 6.719 ± 0.103% / day, the highest absolute weight growth was obtained at treatment P1. P1 treatment with an average value of 0.031 ± 0.027 gram, absolute length growth was obtained in treatment P1 with an average value of 23.025 ± 0.667 mm, the highest survival rate was obtained in treatment P2 with an average value of 96.333 ± 3.549%, but not different real with treatment P2 (93.333 ± 3.443%) and treatment P4 (92.417 ± 2.062). The conclusion of this study is that stocking density has a significant effect on the growth of vannamei shrimp which are being maintained at the PL-10 stage. The best stocking density in this study was P1 treatment (75 fish / 40 liters).

The endocrine and metabolic response to feeding in the developing lamb

1989 ◽  
Vol 123 (2) ◽  
pp. 295-302 ◽  
Author(s):  
M. E. Symonds ◽  
D. C. Andrews ◽  
P. Johnson
Keyword(s):  
Heart Rate ◽  
Growth Rate ◽  
Metabolic Response ◽  
Plasma Concentrations ◽  
Age Groups ◽  
Carbon Dioxide Production ◽  
Formula Milk ◽  
Before And After ◽  
The Mean ◽  
Arterial Plasma

ABSTRACT Oxygen consumption (VO2), carbon dioxide production (VCO2), heart rate and the arterial plasma concentrations of glucose, non-esterified fatty acids, thyroxine (T4), 3,5,3′-tri-iodothyronine (T3), TSH, insulin, cortisol and GH were measured before and after feeding a formula milk diet to lambs aged 9, 21, 33 and 46 days. In all age groups, VO2, VCO2 and heart rate increased significantly following feeding and this effect was greatest at 9 days of age. Both VO2 and VCO2 before and after feeding decreased with age. Plasma concentrations of T3 before feeding did not change with age, but plasma T3 levels after feeding were significantly higher in lambs aged 9 days compared with 33 and 46 days. There was no effect of feeding on TSH or age on plasma TSH and T4 concentrations. In all age groups, glucose concentration increased after feeding and was paralleled by a rise in insulin concentration. At 9 and 21 days of age plasma glucose and insulin concentrations reached a plateau after the initial postprandial increase and together with a rise in respiratory quotient was indicative of a stimulation of carbohydrate oxidation. Plasma concentrations of GH increased after feeding at 21 days and older, when the mean growth rate was also stimulated by 75%. Basal metabolic rate and dietary-induced thermogenesis both decreased with age and, as a result, metabolism associated with an increase in GH levels after feeding became more efficient in terms of growth rate after 21 days. It is therefore concluded that there are major endocrine and cardiorespiratory changes in response to feeding of the young lamb which are important in stimulating and/or facilitating its growth and development. Journal of Endocrinology (1989) 123,295–302

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