scholarly journals Biometric Indices and Condition factors of Pomadasys jubelini (Cuvier, 1830) from Obuama Creek, Nigeria

2020 ◽  
Vol 25 (2) ◽  
pp. 45-52
Author(s):  
Olaniyi Alaba Olopade ◽  
Henry Eyina Dienye ◽  
Cynthia Chigazu Okonkwo
Keyword(s):  
Condition Factor ◽  
Fork Length ◽  
Allometric Growth ◽  
Length Frequency ◽  
Protection Measures ◽  
Morphometric Characters ◽  
Frequency Distributions ◽  
A Value ◽  
Rivers State ◽  
Biometric Indices

Biometric indices of Pomadasys jubelini from Obuama Creek, Rivers state, Nigeria were investigated using length frequency distributions (LFDs), length-weight relationships (LWRs), length-length relationships (LLRs), condition factors (allometric, KA, Fulton’s, KF and relative, KR). Specimens were captured in a stretch of the creek from March to September 2019. A total of 229 specimens were examined with the total length (TL) and weight (W) ranging from 8.7 to 50.4 cm and 8.7 to 834.5 g respectively. The standard length (SL) ranged from 5.3 to 46.8 cm, fork length (FL) was between 6.5 to 48.7 cm and the girth length (GL) varied from 4.7 to 38.7 cm. The relationships of weight-length showed a negative allometric growth pattern with a value of "b" of 2,666. Fulton's condition factor (KF) ranged from 0.10 to 5.45, with an average of 1.21±0.66 indicating perfect wellbeing for the species. The LLR's allometric coefficient ' b ' between TL vs. FL and TL vs. GL showed positive allometric growth, while SL vs. FL, SL vs. TL, SL vs. GL, and GL vs. TL showed negative allometric growth, although the values were close to 1. These findings also provided some new and updated information on some of the morphometric characters of Pomadasys jubelini in Obuama Creek that could be useful for fisheries management and fish species protection measures in the creek and adjacent habitats.  

scholarly journals Some Aspects of the Growth Features and Condition Factor of Arius Gigas (Boulenger, 1911) from Obuama Creek (Rivers State, Nigeria)

2021 ◽  
Vol 23 (2) ◽  
pp. 63-74
Author(s):  
Olaniyi Alaba Olopade ◽  
Henry Eyina Dienye ◽  
Esther Ifeyinwa Nwosu
Keyword(s):  
Condition Factor ◽  
Management Strategies ◽  
Mean Value ◽  
Basic Information ◽  
Allometric Growth ◽  
Length Frequency ◽  
Frequency Distributions ◽  
Biological Features ◽  
Rivers State ◽  
Growth Features

Abstract Length-frequency distributions, length-weight relationships, length-length relationships and condition factors (Fulton’s KF, allometric KA, and relative KR) of Arius gigas in the Obuama Creek in Rivers State, Nigeria were investigated. 217 samples were collected from artisanal fishermen fishing on the Obuama Creek from March to September 2019. The parameter b of the length-weight relationship was 2.52 indicating negative allometric growth. The KF ranged from 0.51 to 2.03 with a mean value of 0.85 ± 0 while the overall low values of KR and KA, in this study are generally a characteristic of fish in poor health. This study provides basic information on some of the biological features of A. gigas which should be useful for facilitating management strategies and regulations of the stocks.

scholarly journals Some population characteristics of Oxynoemacheilus angorae (Steindachner, 1897) from the Perşembe Plateau meandering streams in Ordu, Turkey

2021 ◽  
Vol 29 (2) ◽  
pp. 100-107
Author(s):  
Serdar Yedier ◽  
Derya Bostanci ◽  
Nazmi Polat
Keyword(s):  
Condition Factor ◽  
Fork Length ◽  
Population Characteristics ◽  
Allometric Growth ◽  
Male And Female ◽  
Meandering Streams ◽  
Black Sea Region ◽  
Total Length ◽  
Length Relationship ◽  
Average Condition

Abstract The aim of the current study was to determine the length-weight relationship (LWR) and length-length relationship (LLR) with condition factor (K) values for Oxynoemacheilus angorae from the Perşembe Plateau meandering streams in Ordu, Turkey. A total of 65 fish specimens, which were caught with electrofishing gear, were examined. Fish standard length (SL), fork length (FL), total length (TL), and body weight (W) were determined. There were no statistical differences between the measurements of male and female O. angorae specimens; therefore, the female and male specimens were evaluated together in the current study. The LWR equation and determination coefficient of O. angorae were W = 0.014 TL2.7359 (r2 = 0.9659). The 95% confidence interval of the b value for the O. angorae specimens from the Perşembe Plateau meandering streams was 2.7261 to 2.7435. In the present study, it was determined that O. angorae specimens showed negative allometric growth. Calculations of O. angorae TL-SL, TL-FL, and FL-SL relationship equations and determination coefficients were as follows: TL = 0.2091+1.1646 SL, (r2 = 0.986); TL = 0.1341+1.0301 FL (r2 = 0.9914); and FL = 0.0998+1.1261 SL, (r2 = 0.9868), respectively. A new maximum total length was recorded for O. angorae in this study. The average condition factor value of O. angorae was 0.9954. This value could have indicated that this species was encountering some problems in this habitat. The O. angorae parameters determined were the first data reported for the Perşembe Plateau meandering streams in Ordu, Turkey (Middle Black Sea Region).

scholarly journals Growth pattern of three species of Mullets (Pisces: Mugilidae) in Sombreior River, Rivers State, Niger Delta, Nigeria

2020 ◽  
Vol 5 (2) ◽  
pp. 68-72 ◽  
Author(s):  
Henry Eyina Dienye ◽  
Olaniyi Alaba Olopade
Keyword(s):  
Fish Species ◽  
Growth Pattern ◽  
Niger Delta ◽  
Condition Factor ◽  
Well Being ◽  
Biological Information ◽  
Allometric Growth ◽  
Good State ◽  
Abiotic And Biotic Factors ◽  
Rivers State

Length-weight relationships (LWRs) and condition factor are important biological information to assess the growth pattern and wellbeing of fish species influenced by numerous abiotic and biotic factors. To date, no data on the LWRs and condition of mullets in Sombreior River, Niger Delta. Hence, this research was conducted to determine abundance, length–weight relationship and Fulton’s condition factor (K) of three species of fish belonging to family Mugilidae in Sombreior River, Nigeria. There were a total of 248 samples from five sampling stations for a period of months. Fish species were of various sizes ranging from 24.66±0.40 to 26.35±0.26cm in length and 141.41±6.30 to 161.56±5.87g in weight. For the three species, slope (b) values ranged from 2.18 to 2.68 indicating a negative allometric growth of all fish species. The mean condition factor ranged from 0.89±0.03 forsix Mugil cephalus to 0.93±0.03 for Parachelon grandisquamis while the coefficients of determination (R2) of the LWR regressions ranged between 0.64 (Neochelon falcipinnis) and 0.79 (Parachelon grandisquamis). It was concluded that the mullets in the Sombreior River had a negative allometric growth pattern and the condition is showing the species were in good state of well-being since mean K values are  greater than 1.

scholarly journals Abundance, seasonality and size of Atlantic salmon smolts entrained on power station intake screens in the Severn Estuary

1994 ◽  
Vol 74 (3) ◽  
pp. 527-534 ◽  
Author(s):  
P.N. Claridge ◽  
I.C. Potter
Keyword(s):  
Atlantic Salmon ◽  
Standard Length ◽  
Condition Factor ◽  
Early Summer ◽  
Length Frequency ◽  
Power Station ◽  
Severn Estuary ◽  
Frequency Distributions ◽  
The Mean ◽  
One Year

Atlantic salmon smolts were sampled from the intake screens of the Oldbury power station in the inner Severn Estuary at weekly intervals between July 1972 and June 1977. These catches, and those taken over nearly three years from the nearby Berkeley power station, demonstrated that the abundance of smolts in the estuary peaked in autumn (October) and, to a far greater extent, in spring (April and May). However, small numbers of smolts were occasionally found in all other months of the year except July. Standard length-frequency distributions of smolts remained unimodal throughout the year. Lengths ranged from 76 to 187 mm, mean 130·2 ±1·87 mm (95% CL), and wet weights ranged from 5·4 to 68·0 g, mean 26·9 ±1·17 g. The mean monthly standard length of smolts increased slightly between the autumn of one year and the spring/early summer of the next year, suggesting that, on average, the former were six months younger than the latter. The condition factor was significantly greater in autumn (1·40) than in spring (1·23). It is estimated that the total number of salmon smolts entrained annually on the screens at Oldbury during the five years ranged from 92 to 791, with a mean of 405. Total estimated numbers at Berkeley ranged from 196 to 788 per annum. The numbers at Oldbury are lower than those estimated for the downstream migrants of the Twaite shad, another anadromous species, and far lower than those of the most abundant of the marine fish species that use the Severn Estuary as a nursery area.

scholarly journals Morphometry, length-weight relationship and relative condition factor of red-toothed trigger fish, Odonus niger

2021 ◽  
Vol 42 (4) ◽  
pp. 1026-1032
Author(s):  
N.K. Suyani ◽  
◽  
R. Mridula ◽  
K.M. Rajesh ◽  
M.M. Meshram ◽  
...  
Keyword(s):  
Condition Factor ◽  
Coefficient Of Determination ◽  
Allometric Growth ◽  
Morphometric Measurements ◽  
Morphometric Characters ◽  
Weight Relationship ◽  
Relative Condition Factor ◽  
Wide Range ◽  
Size Groups ◽  
Combined Data

Aim: The study aimed to investigate the morphometric and meristic measurements, length-weight relationship and relative condition factor of Odonus niger landed along coastal Karnataka. Methodology: The morphometric and meristic measurements, length-weight relationship and relative condition factor (Kn) of O. niger was studied for a period of eight months from August 2019 to March 2020. The different morphometric characters were subjected to statistical analysis. The length-weight relationship was analyzed for both the sexes (female and male) and combined data. Monthly relative condition factor was analyzed for both the sexes and for different size group. Results: A comparison of different morphometric measurements exhibited good extent of correlation indicating good extent of interdependence of these characters. Four out of eight morphometric characters are environmentally controlled and suggested wide range of zoogeographical distribution of O. niger. The length-weight relationship is indicated as W = 0.046 L2.565, W = 0.044 L2.589 and W = 0.047 L2.561 with coefficient of determination (r2) of 0.910, 0.913 and 0.910 for male, female and combined sexes, respectively. The 'b' values of both the sexes (male and female) exhibited negative allometric growth (p<0.05) and appeared to be leaner. There was no significant (p<0.05) variation for relative condition factor (Kn) among the months and size groups. However, little higher values were observed during November and February. Interpretation: The study fills the knowledge gap and support for developing a suitable management system for this fish species.

scholarly journals Comparison of Length and Weight Characteristics of O. niloticus and O. aureus from Garmat Ali River, Iraq

2021 ◽  
pp. 39-51
Author(s):  
Abdul-Razak M. Mohamed ◽  
Ayat N. Salman
Keyword(s):  
Fish Species ◽  
Condition Factor ◽  
Age Groups ◽  
Age And Growth ◽  
Allometric Growth ◽  
Frequency Distributions ◽  
Cichlid Species ◽  
Relative Condition Factor ◽  
Dominant Fish ◽  
Management And Conservation

Cichlid species invaded the Iraqi waters in the mid-2000s and are now dominant fish species. The present study was carried out to investigate the age and growth of two cichlid species, Oreochromis niloticus and O. aureus in Garmat Ali River, Iraq from October 2019 to September 2020. A total of 2707 specimens of O. niloticus ranging from 7.0 to 25.5 cm and 1664 of O. aureus varying from 7.0 to 26.3 cm were examined which were captured by various fishing gears. The length-frequency distributions revealed that fish lengths (13.0-18.0 cm) formed 64.1% of the total catch of O. niloticus and 67.2% of O. aureus. The length-weight relationships were W=0.012*L3.109 for O. niloticusand W=0.015*L3.075 for O. aureus, and both species indicated positive allometric growth. The highest values of the relative condition factor were obtained during spring and the values decrease when length of two species increase. Seven age groups were determined for O. niloticus: 9.9, 12.9, 15.6, 17.9, 19.4, 20.4 and 22.2 cm, and for O. aureus: 9.3, 12.5, 15.2, 18.0, 19.4, 21.3 and 22.2 cm. The theoretical maximum length (L∞) was 29.2 cm for O. niloticus and 28.6 cmfor O. aureus. These results can assist in fisheries management and conservation of the fish species in Iraqi waters.

Age and growth of Australian grayling, Prototroctes maraena Gnnther (Salmoniformes : Prototroctidae), in the Tambo River, Victoria

1983 ◽  
Vol 34 (3) ◽  
pp. 451 ◽  
Author(s):  
TM Berra ◽  
PL Cadwallader
Keyword(s):  
Age Determination ◽  
Fork Length ◽  
Age And Growth ◽  
Scale Growth ◽  
Length Frequency ◽  
Age Classes ◽  
Frequency Distributions ◽  
Overall Ratio ◽  
The Relationship ◽  
Australian Grayling

The age and growth of Australian grayling were studied in 1203 individuals collected from the Tambo River, Victoria, between January and November 1979. Scales from 667 grayling were examined. The scale method of age determination was validated by the analysis of seasonal changes in the pattern of scale growth and by correspondence between ages inferred from length-frequency distributions and ages determined by scale readings. One annulus is formed on the scale by October. Most (88%) grayling belonged to the 1+ and 2+ age-classes; fish aged 3+ and 4+ made up 11% of the collection, and fish aged 5+ less than 1%. Size increased from January until May; growth ceased during winter and resumed in September. There was no difference in growth between the sexes. The largest grayling collected was a female of 253 mm fork length (Lf). The overall length-weight relationship was W = 2 715 × 10-6Lf3 2764. The relationship between total length (Lt) and Lf was Lt = 0.93 16 + 1.0742 Lf, and between standard length (Ls) and Lf was Ls = 0.8007 + 0.9095 Lf The overall ratio of males to females was 56 : 44.

scholarly journals Studies on Length-weight and Length-length Relationships, Relative Condition Factor and Fulton’s Condition Factor of Hemiculter leucisculus (Pisces: Cyprinidae) from the Southwestern Caspian Sea Basin

Our Nature ◽  
2013 ◽  
Vol 11 (1) ◽  
pp. 25-30
Author(s):  
H. Mousavi-Sabet ◽  
A. Habibi ◽  
O. Bagherpur
Keyword(s):  
Caspian Sea ◽  
Condition Factor ◽  
Fork Length ◽  
Allometric Growth ◽  
Growth Trend ◽  
B Values ◽  
Total Length ◽  
Relative Condition Factor ◽  
Males And Females ◽  
Hemiculter Leucisculus

In this study, length-weight (LWR) and length-length relationships (LLRs), relative condition factor (krel) and Fulton’s condition factor (k) of 235 Hemiculter leucisculus Basilewsky were determined between the periods of March 2012 to February 2013 in Sefidroud River, in the Southwestern Caspian Sea basin. The maximum recorded total length for males and females were 16.90 cm and 18.10 cm, respectively. The length-length relationships among the total length (TL), fork length (FL) and standard length (SL) for H. leucisculus were found to be highly significant (r2>0.968, p<0.001). The length-weight relationship shows the obtained b values for males, females and male-females were 2.549, 2.680 and 2.465 respectively, which indicated a negative allometric growth trend of this species. Also, relative condition factor (Krel) for males, females and male-females were 0.710, 0.622 and 0.743 respectively and Fulton’s condition factor (K) for males, females and male-females were 0.922, 0.842 and 0.843 respectively. These results will be useful for ?shery managers to impose adequate regulations for sustainable ?shery management.DOI: http://dx.doi.org/10.3126/on.v11i1.8240 Our Nature Vol.11(1) 2013: 25-30

scholarly journals Relationships between fish and otolith dimensions of Pomatomus saltatrix (Linnaeus, 1766) (Perciformes: Pomatomidae) in southeastern Brazil

2019 ◽  
Vol 17 (1) ◽  
Author(s):  
Geysa M. de Souza ◽  
Rafael de A. Tubino ◽  
Cassiano Monteiro-Neto ◽  
Marcus R. da Costa
Keyword(s):  
Food Habits ◽  
Condition Factor ◽  
Specific Model ◽  
Southeastern Brazil ◽  
Length Frequency ◽  
Pomatomus Saltatrix ◽  
Relative Growth ◽  
Frequency Distributions ◽  
Growth Constants ◽  
Species Specific

ABSTRACT The bluefish, Pomatomus saltatrix (Linnaeus, 1766), was used as a species-specific model to study morphometric relationships between otolith size and relative growth variables. Length-weight relationships between Otolith (Length-OL, Height-OH, and Weight-OW) and fish measurements (Total Length-TL and Total Weight-TW) were determined for fishes captured monthly during the year 2015 off the southeastern coast of Brazil. The ANCOVA and Kruskal-Wallis analysis did not indicate significant differences in the relative growth constants between sexes and length frequency distributions (p > 0.05). The condition factor also did not present significant differences between sexes, and right and left otolith measurements (p > 0.05). A total of 398 specimens were sampled: TL = 43.6-67.0 cm, TW = 365-2400 g, OL = 9.65-15.25 mm, OH = 3.65 - 5.45 mm and OW = 0.03-0.11 g. The LWR for grouped sexes was TW = 0.050TL2.55 and otoliths OW = 6.17E-05OL2.59. The best adjustments were TL vs OL (r2 = 0.90); OL vs OW (r2 = 0.90); TW vs OW (r2 = 0.81); and TW vs OL (r2 = 0.80). These results showed that such relationships are helpful tools for predicting the fish size and weight from otoliths, which may be used in food habits and paleontology studies, and other fisheries management applications.

An ageing methodology, growth parameters and estimates of mortality for hake (Merluccius australis) from around the South Island, New Zealand

1997 ◽  
Vol 48 (3) ◽  
pp. 201 ◽  
Author(s):  
Peter L. Horn
Keyword(s):  
New Zealand ◽  
West Coast ◽  
Growth Parameters ◽  
Length Frequency ◽  
The South ◽  
Female Fish ◽  
The West ◽  
Frequency Distributions ◽  
A Value ◽  
One Year

A method is described to determine the age of hake by counting zones in sectioned otoliths. The technique was validated to age 1 years from the progression of modes in length–frequency distributions, and for ages 2 years onwards by examining the state of otolith margins from fish sampled regularly over a one-year period. von Bertalanffy growth parameters are estimated for hake on the Campbell Plateau and Stewart–Snares shelf, on the Chatham Rise, and off the west coast of the South Island. Hake grow rapidly for about five years, but growth is slight after about 12 years. Female fish have a significantly faster rate of growth than males. A value forM of 0·20–0·25 is proposed. Differences in growth rates and population age distributions imply that there are at least two stocks of hake in New Zealand waters, with fish off the west coast of the South Island being distinct from those on the Campbell Plateau and Chatham Rise.

Sign in / Sign up

Export Citation Format

Share Document