scholarly journals Optimizing Harvest Time Through Absolute and Relative Growth of the Black Clam, Chionista fluctifraga, Cultivated in the Intertidal Along the Southeastern Coast of the Gulf of California

2021 ◽  
Vol 22 (2) ◽  
Author(s):  
Andrés Martín Góngora-Gómez ◽  
María José Acosta-Campos ◽  
María Fernanda Navarro-Chávez ◽  
Hervey Rodríguez-González ◽  
Lizeth Carolina Villanueva-Fonseca ◽  
...  
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Gulf Of California ◽  
Shell Height ◽  
Coefficient Of Determination ◽  
Relative Growth ◽  
Harvesting Time ◽  
Final Survival ◽  
Relationship Of ◽  
First Time

The shell height-body weight relationship of the black clam Chionista fluctifraga cultivated in the intertidal of the southeastern Gulf of California, was evaluated for the first time, to improve the knowledge in determining its harvesting time. Clam seeds (n=900,000; 6.1±1.9 mm) were produced in the laboratory. The culture was divided into pre-fattening in racks on the bottom (2 months) and fattening directly in the bottom (16 months) from May 2018 to October 2019. Each month, 60 (n=1080) clams were randomly selected to stablish the morphometric relationship between shell height (SH) and body weight (BW). The growth rate (mm/d and g/d) was recorded. The SH-BW Interaction in both cultivation phases showed positive allometry. SH in prefattening and fattening registered a growth rate of 0.072 and 0.058 mm/d, respectively. In fattening, the interaction BW-SH displayed a high coefficient of determination (R2=0.99). A final survival rate of 90% was obtained. The results yielded the equations that describe the relative growth of C. fluctifraga for the fattening stage. A harvesting time after 10 months of fattening in the intertidal zone is stablished to reach the commercial size (35 mm, SH).

scholarly journals Morphometric relationships of the siphon clam Panopea globosa (Bivalvia: Hiatellidae) in the southeasternmost of the Gulf of California, Mexico

2019 ◽  
Vol 53 (3) ◽  
pp. 363
Author(s):  
Andrés Martín Góngora-Gómez ◽  
Maria Isabel Sotelo-Gonzalez ◽  
Apolinar Santamaría-Miranda ◽  
Manuel García-Ulloa
Keyword(s):  
Body Weight ◽  
Shell Length ◽  
Gulf Of California ◽  
Coefficient Of Determination ◽  
Shell Weight ◽  
Relative Growth ◽  
First Report ◽  
Tissue Weight ◽  
Length Width

The morphometric relationships of the siphon clam Panopea globosa from Sinaloa, Mexico, were analyzed from February 2014 to April 2015. A total of 370 specimens were collected, measured (shell length, width, and height) and weighed (body weight, tissue weight, and shell weight). The coefficient of determination indicated variation in the fitting of morphometric variables among measured traits. The type of relative growth for all morphometric relationships was negative allometry. This is the first report on morphometric relationships of P. globosa from Sinaloa, Mexico.

scholarly journals Features of body weight growth in meat breeds heifers

2016 ◽  
Vol 18 (2) ◽  
Author(s):  
R. S. Oseredchuk ◽  
N. P. Babik ◽  
V. V. Fedorovych ◽  
E. I. Fedorovych ◽  
V. R. Dutka
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Weight Changes ◽  
Body Weight Changes ◽  
Relative Growth ◽  
Weight Growth ◽  
Rate Of Increase ◽  
The Difference ◽  
Tension Increase ◽  
Better Than

The data on the dynamics of body weight changes, absolute and average daily gains, frequency rate of increase in body weight, relative growth rate and intensity of body weight growth of Limousine and Volyn Meat breeds heifers. Both studied breeds characterized by different body weight at different age periods. Newborn Limousine breed heifers are weighed 2,7 kg more (P < 0.05) than Volyn Meat breed heifers; at 3 months age the difference was 8.5 kg (P < 0.05) at 6 months – 14.6 kg, at 9 month – 20.8 kg (P < 0.05), at 12 months – 25,6 kg (P < 0.05), at 15–months – 31.9 (P<0,05), and at 18 months – 23.5 kg. Total and average daily gains in animals of both breeds were the highest for a period of 3 to 6 months of age. In the period from birth to 15 months of age preference for average daily gains were in Limousine, however, the difference was statistically significant only for the period of 0 – 3 months and amounted to 63,9 g (P < 0,05). From 15 to 18 months of age Limousine slightly conceded to Volyn Meat breeds on this parameter. In animals of both breeds magnification of body weight increased with age, but over the entire period (from birth to 18 months) this parameter in Volyn Meat heifers was 0.6 times better than Limousine heifers. The coefficients of relative intensity and tension increase of body weight in animals of both breeds were highest in the period from birth to 3 months of age. With age, these indicators declined. Mainly, the advantage was in Volyn meat breed heifers, but the difference was not statistically significant.

scholarly journals Length–weight relationship of Charybdis callianassa Herbst, 1789 (Decapoda: Brachyura) in relation to sex and carapace length along the Mumbai coastal water, India

2021 ◽  
Vol 82 (1) ◽  
Author(s):  
Rinkesh N. Wanjari ◽  
Karankumar K. Ramteke ◽  
Shailendra Raut ◽  
Nishikant Gupta
Keyword(s):  
Body Weight ◽  
Coastal Water ◽  
Carapace Length ◽  
Total Weight ◽  
Pooled Data ◽  
Weight Relationship ◽  
Trawl Fishing ◽  
Relationship Of ◽  
First Time ◽  
Fisheries Biology

Abstract Background The present study was performed to determine carapace length–body weight relationship of Charybdis callianassa. In fisheries biology, length–weight relationships are important as they allow for the calculation, by creating a mathematical equation between the two, of the total weight of the fish in a particular group in fish. Such information is helpful for fishery scientists to research the dynamics of development and populations and for public agencies that can maintain and preserve these resources sustainably. Results A study on the carapace length–body weight relationship of Charybdis callianassa (Herbst, 1789) was made on the northwest coast of India for the first time. The study was based on experimental trawl fishing conducted fortnightly from August 2019 to March 2020. A total of 479 specimens, including 262 males and 217 females from fishing trawler, were examined for their carapace length and total weight. The carapace length ranged from 2.69 to 3.54 cm, and the total weight from 5.26 to 7.36 g. This analysis revealed that the crabs exhibited negative allometric development, as shown by average exponents 'b' = 2.71 for pooled data with high coefficient (r) = 0.91 and r2 = 0.83. Conclusions The carapace length–body weight relationship of Charybdis callianassa in relation to sex and carapace was studied in the Mumbai coastal water, India. We found major differences in the average “r2” values of species reported for males (0.89), females (0.79) and pooled data (0.83). Such kind of study is essential for fisheries biology to comprehend the differences in circumstances in small and large specimens that vary with environmental conditions and seasons.

Sexual maturity and related phenomena in the domestic fowl

1955 ◽  
Vol 46 (1) ◽  
pp. 9-18 ◽  
Author(s):  
E. S. E. Hafez ◽  
G. A. R. Kamar
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Domestic Fowl ◽  
Sexual Maturity ◽  
Growth Curves ◽  
Effect Of Temperature ◽  
Relative Growth ◽  
Heavy Body ◽  
June July ◽  
Autumn And Winter

Three hundred and eighty-two Fayomi pullets were available from different hatches throughout the year. The age and body weight, as well as the weight of first eggs at sexual maturity in relation to growth curves, were recorded. The fertilizability and hatchability of the first eggs laid at sexual maturity were also examined from one hundred pullets hatched during the months of November and August.1. (a) The winter hatches (December, January and February) reached sexual maturity at 183 days and at a body weight of 1093 g. The weight of the first ten eggs was 31·8 g., while the period from first to the tenth egg was 26 days. Summer hatches (June, July and August) reached sexual maturity at 165 days and at a body weight of 1124 g., while the weight of the first ten eggs was 32·4 g. and the period from first to tenth egg was 31 days. Autumn hatches (September, October and November) reached sexual maturity at 159 days and at a body weight of 1023 g., while the weight of the first ten eggs was 31·4 g. and the period from first to tenth egg was 23 days.(b) Summer and winter hatches attained sexual maturity at an older age and heavier body weight, and laid heavier first ten eggs in a longer period than autumn hatches.2. The growth curves were higher for the summer hatches than for the spring (March, April and May) ones. Winter and autumn hatches were intermediate. Summer hatches attained sexual maturity at a higher relative growth rate than autumn and winter hatches. In Egypt (30° N.), the effect of temperature seems to override that of daylength in respect to growth and sexual maturity.3. Yearly differences in the attainment of sexual maturity were significant, mainly in December hatches. Individual differences were minimized during summer hatches.4. (a) The first egg laid can be fertilizable and even hatchable. When sexual maturity was attained at an old age or a heavy body weight, the first eggs laid had a greater chance of being fertilizable and hatchable. This is due to the weight of first eggs laid and to the season at which sexual maturity is attained.(b) The attainment of sexual maturity as measured by the fertilizability and hatchability of first eggs, seems to be a gradual phenomenon.

scholarly journals The method of determining the silvicultural and inventory indices of urban spaces with the use of the equations of communication

2018 ◽  
Vol 7 (4) ◽  
pp. 82-90
Author(s):  
Василий Ковязин ◽  
Vasiliy Kovyazin ◽  
Тхи Нгуен ◽  
Thi Nguen
Keyword(s):  
Species Diversity ◽  
Tree Species ◽  
Forest Inventory ◽  
Urban Spaces ◽  
Tree Age ◽  
Coefficient Of Determination ◽  
Relationship Of ◽  
First Time ◽  
The Relationship ◽  
Trees And Shrubs

The purpose of our research was to study the species diversity of trees and shrubs in the memorial Park across three centuries after its formation. Such research we carried out for the first time. In addition, we conducted measurements of forest inventory indices of the studied tree species. The calculated equation of the relationship of tree age with a height and diameter that can be measured. The mathematical models should be used to determine the age of trees, as the drill age is not recommended to use for traditional purposes in the memorial parks. The tightness of the obtained relations inventory indices in the form of a parabola is quite high. The coefficient of determination is 0.82 to 0.99, depending on the type of wood.

Evaluation of two feeder designs for growing pigs

1990 ◽  
Vol 30 (4) ◽  
pp. 491 ◽  
Author(s):  
JK Blackshaw ◽  
AW Blackshaw
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Relative Growth Rate ◽  
Growing Pigs ◽  
Agonistic Interactions ◽  
Initial Body Weight ◽  
Relative Growth ◽  
Feed Utilisation

Two feeder types for self-feeding of grower-finisher pigs were assessed using behavioural and production criteria. The 2 types were a round feeder providing 9 feeding spaces and a 2-space rectangular feeder which allowed the pigs to hide the whole head. Feed utilisation did not differ between feeder types, and relative growth rate (%) corrected for initial body weight was the same for both feeders. Feeder use was similar for both types of feeder and was higher in the afternoon. The frequency of agonistic interactions were the same at both feeders.

Relationship of Dynamic Plant Height and Its Relative Growth Rate with Yield Using Recombinant Inbred Lines of Soybean

2011 ◽  
Vol 37 (3) ◽  
pp. 559-562
Author(s):  
Zhong-Wen HUANG ◽  
Wei WANG ◽  
Xin-Juan XU ◽  
Zi-Xiang WEN ◽  
Hai-Chao LI ◽  
...  
Keyword(s):  
Growth Rate ◽  
Plant Height ◽  
Relative Growth Rate ◽  
Recombinant Inbred ◽  
Recombinant Inbred Lines ◽  
Inbred Lines ◽  
Relative Growth ◽  
Dynamic Plant ◽  
Relationship Of

The relationship of lamb growth from birth to weaning and the milk production of their primiparous crossbred dams

2007 ◽  
Vol 47 (8) ◽  
pp. 899 ◽  
Author(s):  
J. E. Morgan ◽  
N. M. Fogarty ◽  
S. Nielsen ◽  
A. R. Gilmour
Keyword(s):  
Growth Rate ◽  
Milk Production ◽  
Significant Interaction ◽  
Regression Coefficient ◽  
Period 2 ◽  
Pregnancy Weight ◽  
Relationship Of ◽  
First Time ◽  
The Relationship ◽  
Lamb Growth

The growth rate of 667 single cross lambs from birth to 4 weeks (Period 1) and 4 weeks to weaning at 12 weeks (Period 2) was measured, along with the milk production of their 520 primiparous crossbred ewe dams over 3 years. The lambs were the progeny of Poll Dorset rams and first cross ewes lambing for the first time at 12 and 19 months of age. The first cross ewes were the progeny of Merino ewes mated to 30 individual sires from several maternal sire breeds, including Border Leicester, East Friesian, Finnsheep and Coopworth. Milk production of the ewes was measured at ~3, 4 and 12 weeks of lactation using a 4-h milk test. The effect of ewe milk production on lamb growth rate in Period 1 included a significant interaction with lamb birth and rearing type (P < 0.001). These regressions were 52 ± 18 g/day per kg/day for single born and reared, 24 ± 17 g/day per kg/day for multiple born and single reared and 18 ± 17 g/day per kg/day multiple born and reared lambs. The regression of ewe milk production in Period 2 on lamb growth rate in Period 2 was also significant (P < 0.001), although milk production in Period 1 accounted for more variation in lamb growth. There were significant interactions of ewe weight gain (from mid pregnancy to lamb weaning) with season in Period 1 (P < 0.01) and year in Period 2 (P < 0.001). There was also a significant interaction (P < 0.001) of year with ewe mid-pregnancy weight for lamb growth in Period 2. Lamb birthweight had a significant effect on lamb growth rate in Period 2 (regression coefficient 6.68 ± 2.57 g/day.kg, P < 0.01).

Growth and morphometry in abalone (Haliotis rubra Leach) from Victoria

1988 ◽  
Vol 39 (2) ◽  
pp. 161 ◽  
Author(s):  
PE McShane ◽  
MG Smith ◽  
KHH Beinssen
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Shell Height ◽  
Somatic Tissue ◽  
Total Weight ◽  
Site Variation ◽  
Different Seasons ◽  
Haliotis Rubra ◽  
Study Sites ◽  
Relationship Of

Several Victorian populations of the abalone Haliotis rubra were studied. A comparison was made of relationships of the dependent variables, shell width, shell height, foot weight and total weight with shell length of abalone collected from several sites at different seasons. Male and female H. rubra were morphometrically similar. In contrast, the morphometrics for abalone collected from the same site at different times were significantly different, as were the morphometrics of abalone collected from different sites at the same time. Weight yields (foot weight relative to total weight) from Portsea and Apollo Bay were highest in winter and lowest in summer. This correlated with the known reproductive cycle in H. rubra, suggesting a relationship of gonad fullness and somatic tissue weight. Morphometric heterogeneity was attributed to differences in growth rates between sites. Growth rates were estimated at three sites and significant between-site variation was shown. At Mallacoota, H. rubra tagged with a threaded wire tag yielded lower estimates of growth rate than those to which tags were affixed with glue. Differences in growth rate, exclusive of tagging method, were attributed to difference of exposure between the study sites.

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