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.

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.

Fecundity and Gonado-somatic Index of Trichiurus lepturus (Linnaeus, 1758) Along the Zamboanga del Norte Coast

2018 ◽  
Vol 6 (7) ◽  
pp. 120
Author(s):  
Ma. Dulce C. Guillena
Keyword(s):  
Sex Ratio ◽  
Stock Assessment ◽  
Chi Square ◽  
Moon Phases ◽  
Ovary Weight ◽  
Moment Coefficient ◽  
Trichiurus Lepturus ◽  
Significant Difference ◽  
The Relationship ◽  
Somatic Index

Gonado-somatic index and fecundity are tools for measuring the sexual maturity and ability of animals to reproduce.  This study investigates the reproduction of Trichiurus lepturus. Specifically, this aimed to determine the sex ratio, the GSI, the relationship between fecundity and total length, fecundity and total weight, fecundity and ovary weight. The Descriptive Method of research was used.  Percentage and chi-square was utilized in determining the percentage of occurrence and sex ratio respectively.   Pearson r Product Moment Coefficient of Correlation was used to determine the relationships of the parameters. The study revealed that females outnumbered males and the sex ratio for different month showed significant difference.  Spawning season was observed to occur in November and December as revealed in its GSI values and it synchronized with the full and new moon phases.  Fecundity is positively correlated with body weight, body size, and ovary weight where ovary weight is observed to be the best index for fecundity.  The results of this study could be used further for formal stock assessment of cutlassfish fishery.

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.

scholarly journals Student Perceived and Determined Knowledge of Biology Concepts in an Upper-Level Biology Course

2014 ◽  
Vol 13 (2) ◽  
pp. 322-330 ◽  
Author(s):  
Brittany Ziegler ◽  
Lisa Montplaisir
Keyword(s):  
Learning Process ◽  
Student Perception ◽  
Metacognitive Skills ◽  
Lower Quartile ◽  
Significant Difference ◽  
Males And Females ◽  
Upper Level ◽  
The Relationship

Students who lack metacognitive skills can struggle with the learning process. To be effective learners, students should recognize what they know and what they do not know. This study examines the relationship between students’ perception of their knowledge and determined knowledge in an upper-level biology course utilizing a pre/posttest approach. Significant differences in students’ perception of their knowledge and their determined knowledge exist at the beginning (pretest) and end (posttest) of the course. Alignment between student perception and determined knowledge was significantly more accurate on the posttest compared with the pretest. Students whose determined knowledge was in the upper quartile had significantly better alignment between their perception and determined knowledge on the pre- and posttest than students in the lower quartile. No difference exists between how students perceived their knowledge between upper- and lower-quartile students. There was a significant difference in alignment of perception and determined knowledge between males and females on the posttest, with females being more accurate in their perception of knowledge. This study provides evidence of discrepancies that exist between what students perceive they know and what they actually know.

Examination of data normalization procedures for expressing peak VO2 data

1993 ◽  
Vol 75 (5) ◽  
pp. 2288-2292 ◽  
Author(s):  
M. J. Toth ◽  
M. I. Goran ◽  
P. A. Ades ◽  
D. B. Howard ◽  
E. T. Poehlman
Keyword(s):  
Regression Modeling ◽  
Fat Free Mass ◽  
Ratio Method ◽  
Data Normalization ◽  
O2 Uptake ◽  
Peak Vo2 ◽  
Significant Difference ◽  
Males And Females ◽  
The Relationship ◽  
Spurious Results

Peak O2 uptake (VO2) has traditionally been compared among individuals differing in body composition by dividing measured values (1/min) by fat-free mass (FFM) (i.e., ratio method). However, the ability of the ratio method to mathematically remove the confounding influence of FFM from peak VO2 has recently been questioned. Therefore, we compared the effectiveness of the ratio method vs. regression modeling to normalize peak VO2 in a large cohort of males and females for differences in FFM. Regression modeling adjusts peak VO2 according to the relationship derived from the regression of peak VO2 on FFM. Results showed that peak VO2 was 60% higher in males (3.53 +/- 1.01/min) than in females (2.22 +/- 0.6 l/min; P < 0.01). With the ratio method (i.e., peak VO2/FFM), peak VO2 was 15% higher in males (54.6 +/- 12 ml.kg FFM-1.min-1) than in females (47.4 +/- 11 ml.kg FFM-1.min-1; P < 0.01). In contrast, when a regression-based approach was employed to normalize values, no significant difference in adjusted peak VO2 was observed between males and females (3.04 +/- 0.9 vs. 3.01 +/- 1.0 l/min). In conclusion, dividing peak VO2 by FFM can produce spurious results, because this approach does not take into account the nonzero intercept. Therefore, a regression-based approach should be used to normalize peak VO2.

scholarly journals A Sense of Harassment and its Relationship to the Level of Professional Educational Adjustment among a Sample of Employees in the Directorate of Education in Damascus

2017 ◽  
Vol 11 (2) ◽  
pp. 278
Author(s):  
Raghdaa A. Naiseh
Keyword(s):  
Negative Correlation ◽  
Analytical Approach ◽  
Significant Negative Correlation ◽  
Female Workers ◽  
Significant Difference ◽  
Government Education ◽  
Institutional Sector ◽  
Males And Females ◽  
Level Of Significance ◽  
The Relationship

The study aimed to identify the level of a sense of harassment among a sample of workers and institutional sector of government education. It defines the professional level of compatibility among a sample of workers in farming Damascus Directorate. And the study of the relationship between the sense of harassment and professional compatibility among a sample of workers in farming Damascus Directorate. And to identify the level of significance of differences in the answers to the study sample the sense of harassment and scale professional compatibility scale according to the variables of the study: (sex, and marital status), and has been relying on the descriptive and analytical approach, and used two tools of the study: a sense of harassment measure, and the measure of professional compatibility, and amounted to a sample study (144) factor and running in working in the farming Damascus Directorate. Among the most important findings of the study were: The level of the sense of harassment among workers in the Directorate of Education in Damascus was moderate; the professional level of compatibility among workers in the Directorate of Education in Damascus was moderate; a statistically significant negative correlation between the sense of harassment and the professional compatibility; the presence of statistically significant difference between males and females on the sense of harassment and in favor of male workers; a statistically significant difference between the average of married and non-married on harassment and in favor of non-married employees; a statistically significant difference between the average of males and females on the compatibility and in favor of female workers. There was no statistically significant difference between the average married and non-married on the compatibility scal

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.

scholarly journals Identifying the tooth shade in group of patients using Vita Easyshade

2015 ◽  
Vol 09 (02) ◽  
pp. 213-217 ◽  
Author(s):  
Habab Osman Elamin ◽  
Neamat Hassan Abubakr ◽  
Yahia Eltayib Ibrahim
Keyword(s):  
Analysis Of Variance ◽  
Ethnic Background ◽  
Central Incisor ◽  
Significant Relation ◽  
Maxillary Central Incisor ◽  
Number Of Patients ◽  
Significant Difference ◽  
Males And Females ◽  
The Relationship

ABSTRACT Objective: The aim of the present investigation is to identify tooth shade among a group of Sudanese patients. Materials and Methods: Total number of patients was 227. Participant's age ranged from 15 to 72 years, which, was divided into four groups. The tooth included in the study was either right or left sounds maxillary central incisor. Vita Easyshade was used to select the tooth shade. Investigation of the differences of Commission International de l'Eclairage (CIELab) coordinates among gender and state of origin was conducted together with an examination of the relationship between CIELab coordinates and age. One-way analysis of variance was used to test the differences in L*, a* and b* according to state of origin. Results: Results showed that A3 was the most common classical tooth shade respectively. There was highly significant difference in L* between males and females (P = 0.002). There was a significant relation between tooth shade and age (P = 0.026). There was a high significant association between classical tooth shade and Sudan regions (P = 0.00). Conclusion: In conclusion, most common classical shade was A3, women's teeth were lighter than men's. There was a relation between ethnic background and tooth shade.

scholarly journals Management of violent behaviour in acutely relapsed schizophrenics

Curationis ◽  
2004 ◽  
Vol 27 (4) ◽  
Author(s):  
L. Koen ◽  
B.H. Lategan ◽  
E. Jordaan ◽  
D.J.H. Niehaus ◽  
R.A. Emsley
Keyword(s):  
Aggressive Behaviour ◽  
Assessment Tool ◽  
Statistical Correlation ◽  
Violent Behaviour ◽  
Pharmacological Management ◽  
Study Objective ◽  
Behaviour Management ◽  
Significant Difference ◽  
History Of ◽  
The Relationship

The management of aggressive behaviour has always been a criticai issue in psychiatry. Finding measures that can be used to accurately predict the likelihood of assaultative behaviour and thus ensure timeous appropriate pharmacological management remains a dilemma. The study objective was to investigate the naturalistic, pharmacological management of inpatient aggressive behaviour in a group of 50 schizophrenic subjects with a view to determine: (1) whether a presenting history of recent violence lead to altered pharmacological management and (2) whether the NOSIE could be regarded as a useful assessment tool with regards to inpatient behaviour management. No significant difference could be demonstrated between the 2 subsets of subjects (history of violence vs none) with respect to total doses of medication administered. No statistical correlation could be found between the total NOSIE score and the dose of psychotropic medication used. The relationship between a subset of NOSIE-items and the total dose of medication was more complex and a clear linear relationship could be demonstrated for a total score of 0 to 5. In this particular ward setting a presenting history of recent violent behaviour did not influence the administration of medication and neither could the clinical judgement employed by the nursing staff to manage inpatient behaviour be captured by the NOSIE. However, a five-item subset of the NOSIE with questions relating to aggression and irritability warrants further scrutiny in this regard.

scholarly journals The relationship between angiotensin-converting enzyme (ACE) insertion (I) / deletion (D) polymorphism, serum ACE activity and bone mineral density (BMD) in older Chinese

2017 ◽  
Vol 18 (1) ◽  
pp. 147032031668834
Author(s):  
Ya-feng Zhang ◽  
Hong Wang ◽  
Qiong Cheng ◽  
Ling Qin ◽  
Nelson LS Tang ◽  
...  
Keyword(s):  
Bone Mineral Density ◽  
Converting Enzyme ◽  
Mineral Density ◽  
Femur Neck ◽  
Significant Difference ◽  
Hip Bmd ◽  
Males And Females ◽  
Ace Activity ◽  
Older Chinese ◽  
The Relationship

Objective: In this study, we set out to investigate the relationship between angiotensin-converting enzyme ( ACE) I/D polymorphism, serum ACE activity and bone mineral density (BMD) in older Chinese. Methods: A standardized, structured, face-to-face interview was performed to collect demographic information. BMD was measured using dual-energy X-ray absorptiometry (DXA). I/D genotypes of ACE were determined by polymerase chain reaction (PCR) amplification. Serum ACE activity was determined photometrically by a commercially available kinetic kit. Multiple linear regression analysis was used to examine the relationship between ACE I/D polymorphism, serum ACE activity and BMD. Results: A total of 1567 males and 1760 females were selected for analyzing the relationship between ACE I/D polymorphism and BMD. There was no significant difference in spine BMD, total hip BMD and femur neck BMD among different ACE I/D genotypes both in males and females. A total of 1699 males and 1739 females were selected for analyzing the relationship between serum ACE activity and BMD. There was also no significant difference in spine BMD, total hip BMD and femur neck BMD among different serum ACE activity groups both in males and females. Conclusion: There was no relationship between ACE I/D polymorphism, serum ACE activity and BMD in older Chinese.

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