scholarly journals Length-weight relationship and condition factor for twelve fish species from the Igarapé Fortaleza basin, a small tributary of the Amazonas River estuary

2020 ◽  
Vol 50 (1) ◽  
pp. 8-11 ◽  
Author(s):  
Marcos Sidney Brito OLIVEIRA ◽  
Luís Maurício Abdon SILVA ◽  
Luiza PRESTES ◽  
Marcos TAVARES-DIAS
Keyword(s):  
Fish Species ◽  
Condition Factor ◽  
River Estuary ◽  
River System ◽  
First Record ◽  
The Body ◽  
Coefficient Of Determination ◽  
Weight Relationship ◽  
Weight Data ◽  
Small Tributary

ABSTRACT Length and weight data are useful in fisheries management and standard results of fish monitoring programs. Length-weight relationship (LWR) is used for estimating the weight corresponding to a given length, and the condition factor is used to compare the body condition, fatness or health of fish populations. This study aimed to estimate the LWR and the condition factor for 12 freshwater fish species from the Igarapé Fortaleza basin, a tributary of the Amazonas River system in the State of Amapá, eastern Amazon (Brazil). The coefficient of determination, the allometric condition factor and the allometric coefficient varied among species, and were compared with populations elsewhere. In 83.3% of the species, the allometric coefficient remained within the expected range. This was the first record of LWR parameters for Acestrorhynchus falcirostris.

scholarly journals Length-weight relationship and condition factor of eight fish species from the upper Araguari River, State of Amapá, Brazil

2019 ◽  
Vol 41 ◽  
pp. e46666 ◽  
Author(s):  
Luiza Prestes ◽  
Marcos Sidney Brito Oliveira ◽  
Marcos Tavares-Dias ◽  
Maria Gercilia Mota Soares ◽  
Fabiana Calacina Cunha
Keyword(s):  
Fish Species ◽  
Condition Factor ◽  
First Record ◽  
The State ◽  
Coefficient Of Determination ◽  
Weight Relationship ◽  
Estimated Parameters

The present study estimated parameters of the length-weight relationship (LWR) and allometric condition factor for eight fish species from the upper Araguari River, in the State of Amapá, Brazil. A total of 615 fish of eight species were analyzed: Acestrorhynchus falcatus, A. falcirostris, Ageneiosus inermis, Hemiodus unimaculatus, Hoplias aimara, Myloplus asterias, M. ternetzi and Tometes trilobatus. The allometric condition factor varied from 0.742 to 1.435. The coefficient of allometry ranged from 2.723 to 3.225. The coefficient of determination (R2) of the LWR ranged from 0.742 to 0.985. This is the first estimate of the length-weight relationship for fish from the Araguari River and the first record of these parameters for Myloplus ternetzi and Tometes trilobatus.

scholarly journals Length-Weight Relationships and Condition Factors of Several Nigerian Fish Species

2016 ◽  
Vol 8 (1) ◽  
pp. 21-26
Author(s):  
Timothy O. AMOO ◽  
Olaniyi O. KOMOLAFE
Keyword(s):  
Fish Species ◽  
Oreochromis Niloticus ◽  
Condition Factor ◽  
Growth Exponent ◽  
Allometric Growth ◽  
Exponential Equation ◽  
Weight Relationship ◽  
The Mean ◽  
Sarotherodon Galilaeus ◽  
Weight Data

The length-weight relationship and condition factor of Sarotherodon galilaeus and Oreochromis niloticus were observed in Strabag Lake. A total number of 365 individuals of the fish species were caught during the period of study with Sarotherodon galilaeus constituting 65.21% of the total catch while Oreochromis niloticus made up 34.79% of the catch. The mean weight (W) and mean total length (TL) were 56.04 ± 1.019 g and14.64 ± 0.103 cm respectively for S. galilaeus;62.86 ± 2.184 g and15.84 ± 0.171 cm respectively for O. niloticus. The values of constants a and b (growth exponent) were determined from the length and weight data which transformed into the linear equation of log W = log a + b log L. These parameters were then fitted to the exponential equation, W = [aL]b. The respective exponential equation for the length-weight relationship was W = 0.068[L]2.5 for S. galilaeus and W = 0.034[L]2.7 for O. niloticus which shows that both species exhibited negative allometric growth (b < 3.0). The correlation coefficient (r) and condition factor (K) recorded were 0.944 and 6.70 respectively for S. galilaeus and 0.911 and 3.49 respectively for O. niloticus specimens. The species showed negative allometric growth and were thriving well in the environment.

scholarly journals Biological aspects of Longfin Mojarra (Pentaprion longimanus, Cantor 1849) in north coast of Central Java, Indonesia

2018 ◽  
Vol 19 (2) ◽  
pp. 683-689
Author(s):  
DIAN OKTAVIANI ◽  
RIA FAIZAH ◽  
DUTO NUGROHO
Keyword(s):  
Sex Ratio ◽  
Fish Species ◽  
Average Length ◽  
Gonadosomatic Index ◽  
Demersal Fish ◽  
The Body ◽  
North Coast ◽  
Weight Relationship ◽  
Central Java ◽  
Biological Aspects

Oktaviani D, Faizah R, Nugroho D. 2018. Biological aspects of Longfin Mojarra (Pentaprion longimanus, Cantor 1849) in north coast of Central Java, Indonesia. Biodiversitas 19: 683-689. Longfin Mojarra (Pentaprion longimanus) locally named as rengganis, is a demersal fish species that is commonly caught in Scottish seine fisheries off the north coast of Java. The fisheries are in heavily harvest level since decades. The aim of this study was to observe the biological aspects of this species. Observations were made between August 2014-July 2015 from Tegal fishing port, western part of north coast central Java. General life-history parameters were measured, i.e., monthly length frequency for 1876 fishes, among them 573 specimens were observed for length-weight relationship, including 541 specimens for sex ratio and maturity stages. Fulton index, Gonadosomatic index, sex ratio and estimated length at first mature were analyzed. The result showed fish size ranged between 7.4 to 15.3 cmFL with the average length of 11.2+1.75 cmFL. We found that length-weight relationship tends to be isometric which statistically the body growth coefficient (b) is equal to 3 (tc = 0.53 < tab; p<0.05) . Monthly Fulton indexes ranged between 1.05-2.87 with an average of 1.90 + 0.17. Sex ratio during observation was not significantly different (p<0.05) from the expected ratio of 1: 1. Mature females occurred year-round with the highest percentage observed from January to April 2015. The estimated length at first maturity was 13.04 cm FL. These biological parameters will be used to support the population study of the future demersal fish species to improve conservation and management measures.

Condition factor and carapace width versus wet weight relationship in the blue swimming crab Portunus segnis

2015 ◽  
Vol 65 (2) ◽  
pp. 87-99 ◽  
Author(s):  
Ahmad Noori ◽  
Parvaneh Moghaddam ◽  
Ehsan Kamrani ◽  
Arash Akbarzadeh ◽  
Bita Kalvani Neitali ◽  
...  
Keyword(s):  
Body Weight ◽  
Condition Factor ◽  
Carapace Width ◽  
The Body ◽  
Swimming Crab ◽  
Present Contribution ◽  
Weight Relationship ◽  
Wet Weight ◽  
The Persian Gulf ◽  
Portunus Segnis

The size-weight relationship of a species allows for estimating the expected weight based on size. The present contribution aims at evaluating the body weight vs. carapace width relationship and the condition factor of the blue swimming crab Portunus segnis. These characteristics were analyzed for each sex using specimens collected monthly from April 2012 through to March 2013, at the Persian Gulf (Hormozgan Province, Iran). The size of each specimen was measured (carapace width) and weighed (total body wet weight). A total of 302 individuals of P. segnis were analyzed. The body weight-carapace width relationship indicated positive allometric growth in males and isometric growth in females. Body weight was higher in males than females of equivalent carapace width, and the means for condition factors were always higher in females than in males, due to the heavier gonads in the former, an expected pattern for many crabs. In both sexes, the lowest condition factor was detected in winter with an ascending trend in the next seasons. The oscillation in condition factor throughout the sampling year was more prominent in females and related to the reproductive cycle. The information reinforces data to define fishing closed seasons for this portunid that is used in many places in the world.

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