Length-weight Relationship Equations Research Articles

Một số đặc điểm sinh học của cá chỉ vàng - Selaroides leptolepis (Cuvier, 1833) ở vùng biển Tây Nam Bộ, Việt Nam

Biological characteristics of Yellowstrip Scad - Selaroides leptolepis (Cuvier, 1833) were analyzed by using the fisheries biology data collected in landing sites from 2014 to 2015 in the Southwest Sea of Vietnam. Results indicated that the main lengh of Yellowstrip scad in the Southwest sea was 11.3 cm, in the range of 4.5cm to 15.4 cm. The length-weight relationship equations was W=0,000008L3,154 (male), W= 0,000009L3,114 (female), W=0,00002L2,965 (juvenile). Growth parameters (L∞ and K) of the von Bertalanffy equation were 16.3 cm and 1.2/year, respectively. The length at first maturity of fish (Lm50) was 9.8 cm. Male/Female rate of fish was 1.1. The Yellowstrip scad breeds throughout the year but the spawning peaks are observed from Febuary to April. The total mortality Z=4.24/year, the instantaneous natural mortality due to predation, aging and other environmental causes with M= 2.39/year, the instantaneous fishing mortality caused by fishing F=1.85/year and exploitation rate E= 0.44/year.

Length-weight and length-length relationships for four fish species from Talkhehrud River, Urmia Lake basin, Iran

Length–weight and length–length parameters were calculated in the Talkhehrud River, northwestern Iran, for four freshwater fish species belonging to two families. The b values varied between 2.27 and 3.19, with a mean ± SD of 2.2777 ± 0.387. The b parameter values in the length–weight relationship equations were determined as 2.73 for Alburnus atropatenae Berg, 1925; 3.19 for Alburnoides petrubanarescui Bogutskaya & Coad, 2009; 2.92 for Capoeta capoeta (Güldenstädt, 1773); and 2.27 for Oxynoemacheilus persa (Heckel, 1847). This study provides the first reference on the LWRs and LLRs for these species in the Talkhehrud River.

Some Growth Parameters of Chub (Squalius cephalus) Living in Uzunçayır Dam Lake (Tunceli-Turkey)

Bu calisma, Mayis 2011 ile Eylul 2012 tarihleri arasinda Uzuncayir Baraj Golu’nde gerceklestirilmistir. Calismada toplam 334 adet (169 erkek, 161 disi ve 4 cinsiyeti belirlenemeyen) Squalius cephalus (Linnaeus, 1758) ornegi incelenmis, orneklerin 0-XI yas gruplari arasinda dagilim gosterdigi ve disi/erkek oraninin 1:0,95 oldugu belirlenmistir. Total boy degerlerinin erkek bireylerde 13,00-36,20 cm ve disi bireylerde 13,60-33,80 cm; agirlik degerlerinin erkeklerde 25,82-616,00 g ve disilerde 22,10-494,00 g; kondisyon faktoru degerlerinin ise erkekler icin 1,041-1,233, disiler icin 0,890-1,298 arasinda degistigi saptanmistir. Boy-agirlik iliskisi denklemi populasyon genelinde W =0,0073 TL 3,1357 ( R 2 =0,95) olarak tespit edilmistir. Populasyonun von Bertalanffy Buyume parametreleri; L ∞=40,29 cm, K =0,16 yil -1 , t 0 =-1,76 yil, W∞= 800,46 g olarak hesaplanmistir.

Length-weight and length-length relationships of three cyprinid fishes from the Bibi-Sayyedan River, western Iran

This study describes the length–weight and length–length relationships for three cyprinid species from the Bibi-Sayyedan River (western Isfahan provinces, Iran). The slope parameter (b) values in the length–weight relationship equations were determined as 3.0729 for Alburnus mossulensis Heckel, 1843; 2.8509 for Barbus lacerta Heckel, 1843; and 3.0864 for Chondrostoma regium (Heckel, 1843). This study presents the first LWR and LLR references for these species in the Bibi-Sayyedan River.

Growth Patterns and Condition Factor of Hepsetus odoe (Bloch, 1794) Captured in Eleyele Lake, Southwest Nigeria

Hepsetus odoe is a commercially valuable fish and is considered as endemic to Nigeria. The growth patterns and condition factor of Hepsetus odoe from Lake Eleyele, Oyo State were investigated as an aspect of its biology essential for bringing it to culture. A Total of 205 specimens (55 and 150, males and females, respectively) were collected between June, 2012 and August, 2012. The morphometric indices such as Total Length (TL), Standard Length (SL), Body Weight (BW) and Stomach Weight (SW) were assessed using standard methods. Also, the length-weight relationship (W=aLb) and Condition factor (100W/L3) were calculated. Sex ratio of 1:3 (Males and Females) was obtained which shows a female dominated population. The Standard length (SL) and body weight (BW) ranged from 16.60-30.50 cm and 51.0-250.0 g respectively. Length-weight relationship equations were calculated as: Log BW=2.051+3.105log SL (r=0.93) This analysis showed significant relationship between the standard length, body weight and stomach weight. The relative condition factor (Kn) calculated ranged from 0.99-2.14 while the mean K value was 1.24. The condition factor fall within the range recommended for freshwater fish species in the tropics. The growth pattern indicates that the fish follows cube law and exhibited positive allometry growth. This information provides important tool in fishery management and guide for future culture trials.

Length-weight relationships for three species from Beheshtabad River, Karun River Drainage, Iran

The length-weight relationships for three fish species from Beheshtabad River, Karun River Drainage (Western Chaharmahal and Bakhtiari Provinces, Iran) were investigated. The values of the slope parameter ( b ) in the length-weight relationship equations were determined as 2.79 for Capoeta damascina , 3.10 for Chondrostoma regium and 3.09 for Oncorhynchus mykiss , all of which were significantly different from the expected b =3 value, indicating a negative allometric growth pattern for Capoeta damascina and positive allometric growth patterns for Chondrostoma regium and Oncorhynchus mykiss ..

Length–length and length-weight relationships and condition factor of nine freshwater fish species of Nageshwari, Bangladesh

The research carried out the length-length relationships (LLR), length-weight relationship (LWR) and condition factor of nine freshwater small indigenous species viz. G. giuris, E . Danricus, M . pancalus , L . guntea, C. fasciatus, P. sophore, H . Fossilis, C . punctatus and M. cavasius from the waterbodies of Nageshwari, Bangladesh. Relationships among different body lenght parameters of each species were found highly significant with all “r” values being >0.900. LWRs were obtained on the form of TW = aTL b . The “b” values range from 2.65-3.03. The parameter “b” of the length-weight relationship equation showed higher value (>3) only for G. giuris and C. fasciatus . Rest of the specimens showed lower value ( 9.00 . The Fulton’s condition factors showed positive growth tendency for five specimens viz. G. giuris, C. fasciatus, P. sophore, C. punctatus, M. cavasius; and negative tendency for four specimens viz. E . danricus, M . pancalus , L . guntea , and H . Fossilis .

Morphometric characters and condition factors of five freshwater fishes from Pagla river of Bangladesh

The research was aimed to carry out the length-length relationships, length-weight relationship and condition factor of five freshwater small indigenous fish species i.e. Amblypharyngodon mola , Puntius ticto , Cirrhinus reba , Chanda nama and Aspidoparia morar from the Pagla river Bangladesh. The relationships equations among different body length parameters of each species were found highly significant. The length-weight relationship equation were found as TW=0.0351 TL 2.86 for A. mola , TW = 0.0104 TL 3.10 for P. ticto , TW = 0.0261 TL 2.96 for C. reba , TW = 0.0175 TL2.845 for C. nama TW= 0.0101 TL 3.05 for A. morar . The “b” values ranged from 2.845-3.10 which remained on the expected range of optimum growth.

Length-weight relationships of three cyprinid fishes from Sirwan River, Kurdistan and Kermanshah provinces in western Iran

The length–weight relationships (LWR) for three fish species collected in Sirwan River, located in Kurdistan and Kermanshah provinces, western Iran, were estimated. The values of the slope parameter (b) in the length–weight relationship equations were determined as 3.086 for Alburnus mossulensis, 3.382 for Alburnus filippii and 3.425 for Capoeta damascina, all significantly different from the expected b = 3 value, indicating a positive allometric growth pattern for all the three species.

Reproductive Biology of the Indian Oil Sardine Sardinella longiceps From Al-Seeb Waters off Oman

The objective of this study is to examine the reproductive biology of the Omani-Indian oil sardine Sardinella longiceps from Al-Seeb area off the Omani waters. During the period January 2004–December 2008, a total of 1592 sardines were sampled. The lengths of the sampled fish ranged from 11.9 to 22 cm with a mean length of 16.5 ± 1.84 cm and modal length of 15.5 cm. Their weights ranged from 14 to 94.6 g with a mean weight of 42.43 ±15.19 g and modal weight of 43.7 g. The length–weight relationship equations analyzed for the combined sex, female, and male sardines were 2.99 W ? 0.009? L , 2.94 W ? 0.011?L , and 2.94 W ? 0.001?L , respectively. The length at 50% maturity for combined sex, female, and male sardines was 16.35, 16.46, and 16.28 cm, respectively. During the study, the Omani sardines were observed to spawn in October, June, and July, September, June, and January and September during the years 2004, 2005, 2006, 2007, and 2008, respectively. During the sampling period, the relative condition factor Kn varied from one year to another and ranged from 0.36 to 1.46 with a mean of 0.9 ± 0.08. An overall mean sex ratio of 0.68 ± 0.02 proved to be significantly different from the expected theoretical sex ratio of 0.5 (?2 = 200; df = 1; P ? 0.05).

Age and growth of adult gilthead seabream (Sparus aurata L.) in the Aegean Sea

Age and growth of adult gilthead seabream, Sparus aurata were determined from 332 specimens (total N = 476), collected from purse-seiners, in the south-eastern Aegean Sea from November 2006 to January 2007. The fork length and body wet weight ranged from 26.5 to 51.5 cm (mean: 36.6 ± 0.18) and from 375 to 2600 g (mean: 1009.2 ± 14.16), respectively. Age groups were varied between 2 and 7. Growth parameters were estimated as L∞ = 64.97 ± 12.93 cm, K = 0.14 ± 0.07 year−1, t0 = −2.47 ± 1.09 year−1, and index of phi-prime was Φ′ = 2.772 ± 0.51. The length–weight relationship equation of all fish was calculated as W = 0.0515 × L2.737 (r2 = 0.95). The mean condition factor was estimated as 2.058. Mortalities (M, F and Z) and exploitation rate (E) of gilthead seabream from the Aegean Sea were 0.34 year−1, 0.77 year−1, 1.11 year−1and 0.69 year−1, respectively. The result of E indicated that the population was overexploited.

Allometry coefficient variations of the length–weight relationship of skipjack tuna ( Katsuwonus pelamis) caught in the southwest South Atlantic

In most fishery analysis, a size-frequency sample of fish needs to be raised to estimate the size frequency of all fish caught by the boat. This process is usually approached by building a raising factor which is the ratio between the total catch weight and the weight of the sample measured to obtain the size frequency. Estimates of the sample’s weight can be obtained by using a length–weight relationship equation, and the sampled size frequency. Although, the parameters of the length–weight relationship could vary in time (e.g. by month), so the use of a single equation to build raising factors throughout the year could introduce a bias in the raised estimates of catch-at-length. To investigate the monthly variation of the length–weight relationship parameters of skipjack tuna ( Katsuwonus pelamis), fish landed in Itajaı́-SC harbor from May 1995 to June 1996 were sampled. Size frequencies sampled in 1997 were used as a case study in the investigation of the effect of monthly variation of parameters on the raising factors and in consequence, on the estimate of annual catch-at-length. Considering all data, regardless the month of the sample, the estimated length–weight relationship for the skipjack tuna was weight ( kg)=6.54 E−06× length ( cm) 3.29 . There were monthly variations on the allometry coefficient (exponent of the power equation). However, the differences between the coefficient obtained for the grouped data and for each month were not significant in 50% of the cases. The differences between the estimated catch-at-length by using both a general length–weight relationship equation (all data) and several monthly equations, were low and not significant.