scholarly journals PÜLÜMÜR NEHRİ'NDE YAŞAYAN Acanthobrama marmid Heckel, 1843 POPULASYONUNUN BAZI BÜYÜME ÖZELLİKLERİNİN BELİRLENMESİ

2020 ◽  
Vol 15 (4) ◽  
pp. 121-133
Author(s):  
Ebru İfakat Özcan
Keyword(s):  
Condition Factor ◽  
Growth Parameters ◽  
Age Groups ◽  
Age Determination ◽  
Von Bertalanffy ◽  
Allometric Growth ◽  
Sex Distribution ◽  
Male Ratio ◽  
Growth Equations ◽  
Growth Features

In this study, some growth features have been investigated like sex distribution, length and weight relationship, age determination, von Bertalanffy growth parameters and condition factor of population Acanthobrama marmid Heckel, 1843 in Pülümür River. 276 samples examined during the study consisted of 157 females and 119 males and the female/male ratio was calculated as 1/0.758. It was determined that the total length and weight values varied between 7.8-21.1cm and 5.6-121.21 g in all individuals. The population has showed distribution between I-V age groups. Length-weight equation in were determined as W=0.0063L3.248 (R2=0.960) in females, W=0.0062L3.252 (R2=0.958) in males and W=0.0063L3.249 (R2=0.959) in all individuals. Positive allometric growth was observed for both sexes due to the “b” values were statistically different from 3. The von Bertalanffy growth equations were determined Lt=27.00 [1–e–0.247(t+0.876)] and Wt =249.66 [1-e–0.247(t+0.876)]3.248 for female, Lt=27.55 [1–e–0.232(t+0.952)] and Wt=280.02 [1–e–0.232(t+0.952)]3.252 for male, Lt=27.34 [1–e–0.238(t+0.916)] and Wt=261.55 [1–e–0.238(t+0.916)]3.249 for all individuals. Growth performance index (Ф') value was calculated as 2.250 for all individuals. Condition factor varies between 0.548-1.653 in female and 0.567-1.670 in male. It was observed that the value of the condition factor generally increased with age.

scholarly journals Growth characteristics of the European hake, Merluccius merluccius (Linnaeus, 1758), inhabiting northeastern Mediterranean

2020 ◽  
Vol 61 (1) ◽  
pp. 79-88
Author(s):  
Hulya Girgin ◽  
Nuri Başusta
Keyword(s):  
Growth Performance ◽  
Condition Factor ◽  
Growth Parameters ◽  
Age Determination ◽  
Growth Characteristics ◽  
Von Bertalanffy ◽  
Merluccius Merluccius ◽  
Fishing Season ◽  
Male Ratio ◽  
European Hake

In this study, the age and some growth characteristics of the European hake, Merluccius merluccius, from the northeastern Mediterranean were examined during 2015-2016 fishing season. A total of 661 European hake ranging from 9.8 to 51.6 cm in total length was captured by commercial trawler. Female/male ratio was 1/1.15. Age determination was conducted using the sagittal otoliths. Ages of examined individuals ranged from 1 to 7 years. The von Bertalanffy growth parameters fitted to the average measured total lengths-at-age for each sex separately and estimated as L∞= 93.98 cm, k= 0.114 year-1, t0= -0.597 year for females, as L∞= 77.65 cm , k= 0.153 year-1, t0= -0.343 year for males and as L∞= 84.44 cm, k= 0.135 year-1, t0= -0.469 year for combined sexes. The growth performance value (Φ) of the European hake population was computed as 2.98 for combined sexes. Mean condition factor value for population was 0.654±0.021; the highest condition factor was found as 1.01 in fish at age 7.

scholarly journals Some biological properties of spiny eel (Mastacembelus mastacembelus, Banks & Solander, 1794) living in the Upper Euphrates River Basin, Turkey

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mehmet Zülfü Çoban ◽  
Mücahit Eroğlu ◽  
Mustafa Düşükcan
Keyword(s):  
River Basin ◽  
Growth Parameters ◽  
Age Groups ◽  
Mortality Rates ◽  
Biological Properties ◽  
Von Bertalanffy ◽  
Growth Type ◽  
Euphrates River ◽  
Fish Samples ◽  
Exploitation Rate

AbstractThis study was carried out to determine some bioecological characteristics of Mastacembelus mastacembelus, which is the only species of Mastacembelidae family living in Turkey. Fish samples were caught between 2014–2018 from Keban Dam Lake, one of the most important reservoirs of the upper Euphrates Basin. In totally, 348 Mastacembelus mastacembelus individuals were examined, including 178 males and 170 females. The age distributions were defined between the I–XV age groups. Total lengths ranged from 14.20 to 81.80 cm in males and from 15.60 to 77.30 cm in females. Total length–weight relationships were calculated as W = 0.0083 × TL2.6516 for males, W = 0.0043 × TL2.8310 for females and W = 0.0063 × TL2.7256 for all population, and the growth type was estimated as “negative allometric”. The von Bertalanffy growth parameters for all individuals were computed as L∞ = 90.99, k = 0.13, t0 = − 0.45. The total (Z), natural (M), fishing (F) mortality rates and exploitation rate (E) were estimated as Z = 0.313, M = 0.270, F = 0.043 and E = 0.137, respectively. The length at first capture (Lc) was found as 50.72. The optimum, maximum and economic yields were calculated as E0.5 = 0.361; Emax = 0.776; E0.1 = 0.664, respectively.

scholarly journals Age, growth and mortality of the European Seabass, (Dicentrarchus Labrax) in Bardawil lagoon, North Sinai, Egypt

2021 ◽  
pp. 042-046
Author(s):  
El-Desoki Menna O ◽  
Younis Younis M ◽  
A Youssef El-Dakar ◽  
Ahmed Salem M ◽  
Ahmed Kassem S ◽  
...  
Keyword(s):  
Growth Parameters ◽  
Age Groups ◽  
Dicentrarchus Labrax ◽  
Mortality Rates ◽  
Von Bertalanffy ◽  
Fishing Mortality ◽  
European Seabass ◽  
Exploitation Rate ◽  
The Relationship ◽  
North Sinai

Age, growth, and mortality of European Seabass (Dicentrarchus labrax) were studied from a small-scaled fishery of Bardawil lagoon, (North Sinai, Egypt). 181 specimens (16.6 to 35 cm total Length and 39.8 to 367.2 g total weight). The relationship between length and weight was W = 0.0054L3.1428. Age was determined by otoliths and age groups I to IV years were observed. Growths in length and weight at the end of each year were calculated. The growth parameters of von Bertalanffy equation were calculated as (L∞ = 48.69 cm, K = 0.1677 yr -1 and t0 = -0.447 yr -1). Growth performance index was calculated (φ = 2.60 for length and 1.25 for weight). Mortality rates were 0.867 yr-1, 0.25 yr1and 0.617 yr-1 for total, natural and fishing mortality, respectively. The currently exploitation rate E = 0.712 yr-1 indicating that, the population of this species is being heavily exploited.

scholarly journals Age, Growth, Condition Factor and Reproduction of Planiliza abu (Mugiliformes: Mugilidae) in the Al-Diwaniya River, Middle of Iraq

2021 ◽  
pp. 20-29
Author(s):  
Abdul-Razak M. Mohamed ◽  
Mohanad O. Al-Jubouri
Keyword(s):  
Sex Ratio ◽  
Growth Performance ◽  
Performance Index ◽  
Condition Factor ◽  
Age Determination ◽  
The Body ◽  
Allometric Growth ◽  
Spawning Period ◽  
Relative Condition Factor ◽  
Gonad Somatic Index

The age, growth, relative condition factor, and reproduction of Planiliza abu (Heckel, 1843) from the Al-Diwaniya River, Iraq was described in samples obtained from October 2016 to September 2017, using different fishing gears. Total length and weight were measured, scales were used for age determination, and gonads were excised from the body cavity sexed and weighed. The lengths of the species ranged from 7.0 to 20.0 cm, and the most dominant length group was 13.0 cm. The length-weight relationship was W=0.0199*L2.821 revealing a negative allometric growth (b= 2.821). The mean relative condition factor (Kn) was calculated as 1.13 for females and 0.93 for males. Four ages were recognized for the species with mean total lengths of 10.2, 14.5, 39.0, 17.2 and 19.3 cm, respectively. The von Bertalanffy growth parameters based on back-calculated lengths were L∞= 23.4 cm, K=0.38 and to= -0.27. The growth performance index (Ø) of the species is computed as 2.32. The overall sex ratio (male: female) was 1:1.70. The gonad-somatic index (GSI) values of both sexes were highest in April, 8.5 for males and 11.6 for females and the lowest values in August, 0.22 for males and 0.75 for females, indicated that the spawning period was from April to May. Some biological properties such as lengths of individuals, negative allometric growth, ages from 1 to 4 years, values of ultimate growth (L∞) and growth performance index (Ø) and overall sex ratio were among those described for the species in other waters. These results can contribute to providing information for species management in the study river.

scholarly journals Some Biological Aspects of Al - Shabbot Arabibarbus grypus (Heckel, 1843) in Al-Diwanyia River, Middle of Iraq

2019 ◽  
Vol 27 (2) ◽  
pp. 306-316
Author(s):  
Mohanad O. Abdullah Al-Jubouri ◽  
Abdul-Razak M. Mohamed
Keyword(s):  
Sex Ratio ◽  
Condition Factor ◽  
Age Groups ◽  
Allometric Growth ◽  
Relative Condition Factor ◽  
Fish Catch ◽  
Total Fish ◽  
Biological Aspects ◽  
The Mean ◽  
Somatic Index

      Some biological characteristics of shabbot, Arabibarbus grypus (Heckel, 1843) in the Al-Diwaniya River, middle of Iraq were studied from October 2016 to September 2017. Water temperature ranged from 10.2oC in March to 32.8oC in August. A total of 853 fish were caught by seine, gill and cast nets and electro-fishing. A. grypus constituted about 6.27% of the total fish catch. The length-weight relationship was W=0.021*L2.7548 revealing an allometric growth. The mean relative condition factor was 0.91. Five age groups wore recorded and their mean total lengths were 20.2, 32.0, 39.0, 43.9 and 48.4 cm, respectively. The growth model of the species was  Lt= 58 [1-e -0.39 (t-0.313)]. The growth performance index (Φ) of A. grypus was computed as 3.11. The study declares that the species is a omnivore, feeding mainly on aquatic plants, insects, algae and detritus. The overall sex ratio (female: male) was 1.47:1. The highest values of gonado- somatic index (GSI) were 4.20 for female and 1.78 for males in April. The fecundity of the species ranged from 75600 to 124200 eggs. 

scholarly journals Growth parameters of invasive gibel carp Carassius gibelio (Bloch, 1782) in Lake Marmara (Turkey)

2020 ◽  
Vol 49 (4) ◽  
pp. 383-390
Author(s):  
Ali Ilhan ◽  
Hasan M. Sarı ◽  
Irmak Kurtul
Keyword(s):  
Sex Ratio ◽  
Growth Parameters ◽  
Mesh Size ◽  
Gibel Carp ◽  
Western Region ◽  
Von Bertalanffy ◽  
Maximum Condition ◽  
Monthly Basis ◽  
Male Ratio ◽  
Carassius Gibelio

AbstractThe objective of this study was to determine growth parameters, such as age–length and length–weight relationships, as well as condition factors and sex ratio, of the Carassius gibelio (Bloch, 1782) population in Lake Marmara (western region of Turkey), which is one of the most important fishing areas. Fish were caught on a monthly basis by gillnets and trammel nets (mesh size 10–50 mm) between March 2012 and February 2013. A total of 1058 specimens (809 females and 249 males) were examined. The female–male ratio was 1:0.31. The maximum age was determined as VI and V for females and males, respectively. The total length of females and males ranged from 10.0 to 27.5 cm and from 10.2 to 24.0 cm, respectively. Their weight varied from 17.1 to 378.4 g and from 17.7 to 244.9 g, respectively. Length–weight relationship parameters were a = 0.014 and b = 3.040 for females and a = 0.015 and b = 3.039 for males. Von Bertalanffy growth parameters of the C. gibelio population were as follows: L∞ = 35.86 cm, k = 0.189 year−1, t0 = −1.238 years. Minimum and maximum condition factors were 1.56 for females in October and 1.82 in May and 1.67 for males in September and 1.94 in January.

Age and stock structure of gemfish (Rexea solandri) in New Zealand waters

1999 ◽  
Vol 50 (2) ◽  
pp. 103 ◽  
Author(s):  
P. L. Horn ◽  
R. J. Hurst
Keyword(s):  
Growth Parameters ◽  
Age Determination ◽  
Natural Mortality ◽  
Stock Structure ◽  
Von Bertalanffy ◽  
Length Frequency ◽  
Frequency Distributions ◽  
The North ◽  
Spawning Areas

Age determination of gemfish by counting hyaline zones in otoliths was validated by following the progression of modes in length–frequency distributions and the progression of strong and weak year classes in age–frequency distributions. Length–frequency and otolith samples were examined from four areas (west Northland, east Northland and Bay of Plenty, Wairarapa coast, and the Stewart- Snares shelf). Age–frequency distributions and von Bertalanffy growth parameters were calculated and compared between areas. Two gemfish stocks are indicated on the basis of patterns of year class strengths, trends in commercial landings and likely spawning areas; one off the east and north of the North Island, and another off the west and south of the South Island. Estimates of natural mortality are presented for the two stocks.

A study on some population parameters of mantis shrimp (Squilla mantis L., 1758) in Izmir Bay (Aegean Sea)

2017 ◽  
Vol 98 (4) ◽  
pp. 721-726 ◽  
Author(s):  
Naciye Erdoğan Sağlam ◽  
Yeşim Demir Sağlam ◽  
Cemil Sağlam
Keyword(s):  
Sex Ratio ◽  
Condition Factor ◽  
Growth Parameters ◽  
Age Determination ◽  
Aegean Sea ◽  
Population Parameters ◽  
Age Composition ◽  
Mantis Shrimp ◽  
The Mean ◽  
Length Frequency Data

The population parameters of mantis shrimp (Squilla mantis Linnaeus, 1758) were studied regarding age composition, sex ratio, growth, survival and mortality rates, and the exploitation rate in the Aegean coasts of Turkey in 2013. We collected 936 specimens by shrimp gillnets along the coasts of Izmir Province from April to October 2013. The mean condition factor was K = 1.02 for both sexes, while the sex ratio was 58.7% for female and 41.3% male. Mean lengths, mean weight and length–weight relationship were calculated as TL = 12.57 ± 0.07 cm, CL = 3.02 ± 0.02 cm, W = 22.14 ± 0.37 g, W = 0.0098 × L3.02. Age determination was based on indirect ageing through length–frequency data using the Bhattacharya method. The age of the population varied from 0+ to 3+. Von Bertalanffy growth parameters were estimated as TL∞ = 19.69 cm, CL∞ = 4.74, W∞ = 79.41 g, k = 0.50 year−1 and t0 = −0.37 year. Mortality and exploitation rates derived as Z = 1.90, M = 1.16, F = 0.74 and E = 0.39, respectively.

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.

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.

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