scholarly journals Spatial variation in growth of the green tiger prawn (Penaeus semisulcatus) along the coastal waters of Kuwait, eastern Saudi Arabia, Bahrain, and Qatar

2003 ◽  
Vol 60 (4) ◽  
pp. 806-817 ◽  
Author(s):  
Y. Ye ◽  
J.M. Bishop ◽  
N. Fetta ◽  
E. Abdulqader ◽  
J. Al-Mohammadi ◽  
...  
Keyword(s):  
Saudi Arabia ◽  
Coastal Waters ◽  
Growth Parameters ◽  
Arabian Gulf ◽  
Growth Curves ◽  
Growth Equation ◽  
Cooperative Approach ◽  
Penaeus Semisulcatus ◽  
Significant Difference ◽  
Males And Females

Abstract Shrimp (Penaeus semisulcatus) length-frequency data collected from the coastal waters of Kuwait, Saudi Arabia, Bahrain, and Qatar during a 23-month study from 1999 to 2001 were analyzed to estimate parameters of von Bertalanffy growth equation. All growth curves show a strong seasonal oscillation and a difference in size between males and females. The estimates of l∞ exhibit a southward decreasing trend with increasing temperature and salinity. A single variable of annual mean temperature explains 94 and 81% of the variations in l∞ for males and females, respectively. Likelihood ratio tests compared growth parameters among survey areas. A significant difference in growth was found between Kuwait and Kufji, and between Manifa and Dareen. Based on these results, we conclude that three separate populations of P. semisulcatus are present in the western Arabian Gulf: one in Kuwait, one in Kufji and Manifa, Saudi Arabia, and a third occupying Dareen, Saudi Arabia, Bahrain, and Qatar waters. Countries sharing unit stocks should implement a cooperative approach to the management of each.

Age, growth and spatial and interannual trends in age composition of jackass morwong, Nemadactylus macropterus, in Tasmania

2001 ◽  
Vol 52 (4) ◽  
pp. 641 ◽  
Author(s):  
Alan R. Jordan
Keyword(s):  
Growth Parameters ◽  
Life History Strategy ◽  
Growth Curves ◽  
Von Bertalanffy ◽  
Age Classes ◽  
Age Composition ◽  
Significant Difference ◽  
Males And Females ◽  
Recruitment Variability ◽  
The Relationship

Transverse sections of sagittae were examined. The first and second annual increments were defined by examination of the progression of otolith radius and length of the 0+ and 1+ cohorts. Growth in both sexes is rapid until ~5 years old (32–35 cm), and then slows appreciably. There was a broad range of lengths within individual age-classes, with a maximum of 12 age-classes present in a 1 cm length-class. Maximum ages of males and females were 41 and 30 years, respectively, which is considerably higher than previously estimated from whole otoliths. There was no significant difference in the growth curves between males and females, although this is influenced by the large number of juveniles and by the examination of relatively few large, older fish. The sex-specific von Bertalanffy growth parameters are: L∞ 38.4 cm FL, t0 –0.07 years, K 0.36 year–1 for females and L∞ 36.2 cm FL, t0 0.15 years, K 0.42 year–1 for males. The age composition was dominated by 4–7 year olds but showed evidence of considerable recruitment variability, particularly in the strong 1988 year-class. The relationship between the life-history strategy of N. macropterus and recruitment variability is discussed.

scholarly journals Reproductive biology of Gerres longirostris Lacepede, 1801 (Perciformes: Gerreidae) in the western Arabian Gulf

2017 ◽  
Vol 64 (2) ◽  
Author(s):  
Chehab F. H. Hosny ◽  
Abdulrahman M. Al-jaber
Keyword(s):  
Saudi Arabia ◽  
Sex Ratio ◽  
Reproductive Biology ◽  
Arabian Gulf ◽  
Maximum Length ◽  
Size Classes ◽  
Total Length ◽  
Significant Difference ◽  
Males And Females

Reproductive biology of the strongspine silverbiddy, Gerres longirostris Lacepede, 1801, was studied by examining 1910 individuals collected fortnightly between May 2012 and January 2014 from the western Arabian Gulf, off Saudi Arabia. The samples were identified as 470 males, 1370 females and 70 undetermined. Maximum length observed was 30 and 40 cm (total length TL) for males and females, respectively. Overall sex ratio of males to females was found to be 1:3.1. This sex ratio was significantly different from the normally expected 1:1 ratio (p0.05). Females were significantly greater than males in all size classes between 20 and 34 cm with high significant difference (p30.28°C might not be optimal for reproduction of G. longirostris.

scholarly journals Knowledge, Attitudes and Practice of Dental Implants among Dental Interns in Saudi Arabia – A Cross-Sectional Study

2020 ◽  
Vol 14 (1) ◽  
pp. 440-449
Author(s):  
Khaled Alzahrani ◽  
Abdulrahman Mohammed Alnafisah ◽  
Khalid Gohormallah Alzahrani ◽  
Khalid Ghalib Alharbi
Keyword(s):  
Saudi Arabia ◽  
Dental Implants ◽  
Clinical Skills ◽  
Sampling Technique ◽  
Practical Experience ◽  
Cross Sectional Study ◽  
Chi Square ◽  
Cross Sectional ◽  
Significant Difference ◽  
Males And Females

Objective: The aim of the study is to assess knowledge, attitude and practices of dental implants among dental interns in Saudi Arabia Materials and Methods: A self-designed, close-ended questionnaire was distributed among 205 interns chosen by stratified random sampling technique. The questionnaire consisted of 28 items pertaining to demographic characteristics, knowledge and practices of dental implants. Responses were coded and entered into spreadsheet software (Microsoft Excel 16.0.) and analyzed using Statistical Package for Social Sciences (SPSS, IBM Version 22.0) and contingency tables and chi-square test (χ2). Results: The majority of the participants were males (64.4%), between 24-26 years of age (64%) and had a GPA between 4-5 (63.4%). The majority of the participants gained knowledge of dental implants through theoretical lectures (98.5%), and most of them (80%) knew, what material, an implant was made up of. Almost all participants (91.7%) knew that dental implants had surface modifications. Most (64.4%) believed that case selection is the most important criteria for the success of dental implant therapy, and this differed significantly among participants with respect to GPA (p=0.03). Many participants (60%) believed that the most important advantage of dental implants over fixed prosthesis is that reduction of adjacent tooth is not needed, and this differed significantly between males and females (p=0.026). There was a significant difference (p<0.001) between males and females when it came to confidence in independently restoring teeth using dental implants. 63% of the participants were confident to use dental implants in their future practice. Conclusion: Knowledge of dental implants among dental interns is satisfactory, but this study reveals that participants lack practical experience and would like to acquire more clinical skills. Limitations: The response rate of participants from each university was low, which made comparisons between different universities difficult because sample size from some universities was very small, which could not produce statistically accurate results.

Age, growth estimates for pink ling, Genypterus blacodes (Schneider), and gemfish, Rexea solandri (Cuvier), from Eastern Bass Strait, Australia

1989 ◽  
Vol 40 (2) ◽  
pp. 215 ◽  
Author(s):  
AF Withell ◽  
JWJ Wankowski
Keyword(s):  
Growth Parameters ◽  
Age And Growth ◽  
Frequency Method ◽  
Slow Growth Rate ◽  
Growth Functions ◽  
Significant Difference ◽  
Marginal Increment ◽  
Males And Females ◽  
Cent Error ◽  
Age Determinations

Age and growth were estimated from counts of otolith annuli for pink ling (Genypterus blacodes) and gemfish (Rexea solandri). Sections of otoliths were preferable for age determinations of pink ling, whereas whole otoliths were preferable for gemfish. Validation of the assigned age classes was not achieved. Petersen's length-frequency method was unsuccessful and marginal increment methods were unsuitable for the species studied. Growth of males and females did not differ significantly for either pink ling or gemfish. Both species had a relatively slow growth rate, had a moderately long life-span and could reach body lengths in excess of 1 m. Maximum ages of pink ling and gemfish were, respectively, 21 and 13 years. Mean length-at-age and the von Bertalanffy growth functions were estimated. For pink ling (all individuals combined), K = 0.095 and L∞ = 135.5 cm. For gemfish the best estimates were K = 0.153 and L∞ = 112.3 cm. Precision of age determinations made independently by two readers for pink ling and gemfish, respectively, was 65% and 95% within �1 annulus; average per cent error, respectively, was 4.7% and 3.1%. Paired t-tests on ages assigned to each species by the two readers indicated no significant difference between ages assigned to gemfish, but there was a significant, albeit unbiased, difference for ages assigned to pink ling. However, for pink ling, estimates of the growth parameters derived separately from age determinations by the two readers were virtually identical.

Comparison of the Age Structure, Body Size, and Some Growth Parameters of Two Insular Populations of Lyciasalamandra fazilae from Southwestern Turkey

2020 ◽  
Vol 27 (1) ◽  
pp. 19-25 ◽  
Author(s):  
Nazan Üzüm ◽  
Aziz Avcı ◽  
Çiçek Gümüş Özcan ◽  
Kurtuluş Olgun
Keyword(s):  
Body Size ◽  
Cross Sections ◽  
Age Structure ◽  
Life History Traits ◽  
Growth Parameters ◽  
Mediterranean Environment ◽  
Growth Coefficient ◽  
Significant Difference ◽  
Males And Females ◽  
Insular Populations

Some life-history traits (body size, age at maturity, longevity, and growth) of Lyciasalamandra fazilae from two insular populations (Tersane Island and Domuz Island) living in the Mediterranean environment of southwestern Turkey were investigated. We applied phalangeal skeletochronology to obtain the ages of juveniles and adults. Age was determined by counting the lines of arrested growth (LAGs) in cross-sections. No significant differences were found between the age distributions of the two sexes in the Tersane population but there was a significant difference in the Domuz population. The age structure of males and females varied significantly between populations, with highest mean ages observed in the Tersane Island. Males were on average larger than females in both populations. Both males and females from Tersane Island were found to be significantly larger than those of Domuz Island. The growth coefficient K and SVLmax were significantly different between the sexes in Tersane, but not in Domuz population. These parameters also showed significant interpopulational difference only for females indicating Domuz females grew faster than those of Tersane.

Diet of longnose stingray Hypanus guttatus (Myliobatiformes: Dasyatidae) in tropical coastal waters of Brazil

2019 ◽  
Vol 99 (8) ◽  
pp. 1869-1877
Author(s):  
Michel Donato Gianeti ◽  
Leandro Yokota ◽  
Rosangela Paula Teixeira Lessa ◽  
June Ferraz Dias
Keyword(s):  
Coastal Waters ◽  
Diet Composition ◽  
Stomach Contents ◽  
Dietary Shift ◽  
Eastern Brazil ◽  
Significant Difference ◽  
North Eastern ◽  
Opportunistic Predator ◽  
Males And Females ◽  
Stomach Contents Analysis

AbstractThis study investigated the diet of longnose stingray Hypanus guttatus in the tropical waters of north-eastern Brazil. Samples were obtained from monthly sampling of artisanal fisheries from August 2007 to July 2008. A total of 258 specimens were examined, 127 females and 131 males, and stomach contents analysis suggested H. guttatus to be a generalist and opportunistic predator feeding on the most available prey in the environment. There was no significant difference in the diet composition of males and females, or between seasons. However, an ontogenetic dietary shift was observed with larger individuals having an increased proportion of molluscs in the diet, whilst smaller individuals predated primarily on small crustaceans.

scholarly journals [NO TITLE AVAILABLE]

2007 ◽  
Vol 67 (4) ◽  
pp. 707-713 ◽  
Author(s):  
V De Conto ◽  
R Cerqueira
Keyword(s):  
Sexual Dimorphism ◽  
Litter Size ◽  
Post Partum ◽  
Growth Curves ◽  
Gompertz Model ◽  
Significant Negative Correlation ◽  
Gestation Length ◽  
Significant Difference ◽  
In Captivity ◽  
Males And Females

The reproduction, development and growth of Akodon lindberghi were studied in captivity. The colony was derived from animals captured in Simão Pereira, Minas Gerais state, which represents a new area of geographical distribution known for this species. Twelve males and twelve females were crossed, producing 144 young in 53 litters. Post-partum oestrus was observed and gestation length was estimated in 23 days. Litter size ranged from 1 to 4 with a mean of 2.72 (SD = 0.97, n = 53) and modal size of 3. Sexual dimorphism was neither present in body mass at birth nor at weaning. There was a significant negative correlation between litter size and mass at birth or weaning. Permanent emergence of adult external appearance occurred at 15 days. Puberty for males and females was 43 and 42 days, respectively, and the first fecundation event for two females was recorded at 47 and 54 days of age. The weight growth was described by fitting a Gompertz model. No significant difference was found in any parameter of growth curves for males and females. Measurements (head-body, tail, hind foot and internal and external ear lengths) obtained for adult individuals also did not reveal the presence of sexual dimorphism.

scholarly journals Growth of the Silverside Atherinella brasiliensis in Tramandaí Estuary, Southern Brazil (Actinopterygii: Atherinopsidae)

2007 ◽  
Vol 5 (4) ◽  
pp. 485-490 ◽  
Author(s):  
Giovana Bervian ◽  
Nelson F. Fontoura
Keyword(s):  
Growth Parameters ◽  
Growth Curves ◽  
Von Bertalanffy ◽  
Southern Brazil ◽  
Rio Grande Do Sul ◽  
Beach Seine ◽  
Frequency Distributions ◽  
First Reproduction ◽  
Males And Females ◽  
One Year

The growth of Atherinella brasiliensis (Quoy & Gaimard, 1824) was studied through monthly samples taken at Tramandaí Lagoon, Imbé County, Rio Grande do Sul, Brazil. Animals were captured using a beach seine net. Length-weight relationships and age- growth curves for males and females were adjusted. The growth parameters of the von Bertalanffy growth formulae are Linf=16.0 and k=0.883 for males and Linf=17.0 and k=0.825 for females. First reproduction occurred one year after recruitment. Once reaching maturity, adults of A. brasiliensis reproduced once more in the next spring with two-year-olds and disappeared soon after from size frequency distributions. A few captured animals showed a size compatible with an age of three years.

scholarly journals Evaluating the Effects Related to Restocking and Stock Replenishment of Penaeus penicillatus in the Xiamen Bay, China

2021 ◽  
Vol 9 (10) ◽  
pp. 1122
Author(s):  
Jia-Qiao Wang ◽  
Yi-Jia Shih ◽  
Liang-Ming Huang ◽  
Jun Li ◽  
Wei-Wen Li ◽  
...  
Keyword(s):  
Assessment Tool ◽  
Growth Parameters ◽  
Stock Assessment ◽  
Evaluation Model ◽  
Brood Stock ◽  
Xiamen Bay ◽  
Significant Difference ◽  
Males And Females ◽  
The Relationship ◽  
Juvenile Shrimp

The quantitative evaluation of restocking and stock replenishment is essential for providing operational feedback and implementing adaptive management for future restoration projects. Since 2010, approximately 700 million juvenile shrimp (Penaeus penicillatus) have been released into Xiamen Bay, Fujian Province, China, each year, through stock replenishment programs. The recruited shrimp were sampled through three-year bottom trawl surveys from 2014 to 2017. The biological characteristics and catch equation were used to evaluate the effect of restocking and stock replenishment. The analysis uses the FAO-ICLARM Stock Assessment Tool (FISAT II) program. In general, there are two sources of recruitments—one from spawning brood stock and the other from released juvenile shrimp. We constructed an evaluation model for an effect evaluation based on Baranov’s catch equation to separate the initial recruitment volume using survey data. The relationship between body weight and total length was W =1.638 TL2.9307. There is no statistically significant difference between males and females. The von Bertalanffy growth parameters derived for prawns, using FiSAT II, were L∞ = 209.6 mm and K = 0.51 per year. In spring 2014, the initial resource amount was 49,200, while the ratio of effective recruitment and parent amount was 3.92. The survival rate of the released shrimp larvae, 1.88‱, seems to be very unsatisfactory. The resource amount in summer and autumn is higher than in winter and spring. Obviously, the restocking effect is lower and the programs need to be improved. To improve the restocking effect, the replenishment performance should be adjusted to reduce the mortality rate and increase its release effectiveness. Therefore, corresponding implementations are recommended, including standard extensive culture, reduction in stress during transportation, and temporary culture.

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