Query: Length weight relationship of catfish

title: Length weight Relationship, Growth Pattern and Condition Factor of the Silver Catfish Chrysichthys nigrodigitatus (Lacepede, 1803) from Lower River Benue, Nigeria
abstract: This study was carried out to evaluate the length weight relationship, growth pattern and condition factor of the Silver catfish Chrysichthys nigrodigitatus from the Lower River Benue Makurdi, Nigeria. A total of 200 freshly caught specimens of C. nigrodigitatus were collected between July 2013 and September 2013 from the catches of the artisanal fisheries at landing points in Wadata Market, Makurdi. Results obtained showed that the "b" value for the males was 1.6067 while that of the females was 1.6791 and combined sexes 1.7371, indicating a negative allometric growth for this species. Correlation coefficient (r) obtained for males (0.9651) 0.9517 (females) and 0.9329 (pooled sexes) showed a positive significant relationship between length and weight of C. nigrodigitatus. Monthly mean condition factor (K) indicate that C. nigrodigitatus were in good physiological health condition. In conclusion, the baseline data on the length weight relationship, Original Research Article Thomas et al. AJFAR, 1(2) 1 8, 2018; Article no.AJFAR.41964 2 condition factor of C. nigrodigitatus from the lower River Benue provided in this study is crucial in the sustainable management of this species in the River. Also, these findings will be useful in evaluating the population dynamics, stock and the aquaculture potential of C. nigrodigitatus for future purpose.

title: Length weight Relationship and Condition Factor of Blackspot Catfish Auchenoglanis biscutatus from the Lower River Benue Makurdi, Nigeria
abstract: This study was carried out to evaluate the length weight relationship and condition factor of the Blackspot Catfish Auchenoglanis biscutatus from the Lower River Benue Makurdi, Nigeria. A total of 200 freshly caught specimens of A. biscutatus were collected from the catches of the artisanal fisheries from landing points at Wadata Market in Makurdi, between July and September 2013. The result obtained showed that the "b" value for the males was 1.6698, females (1.6201) and combined sexes (1.7318) indicating a negative allometric growth. Correlation coefficient (r) for males was 0.9524, females (0.9290) and combine sexes (0.9085) Monthly mean condition factor (K) indicated that both sexes of A. biscutatus were in good health condition. It is therefore concluded that findings of this study will be useful in the sustainable management of this species in the lower River Benue. Original Research Article Thomas et al. AJFAR, 1(2) 1 7, 2018; Article no.AJFAR.41965 2

title: Length Weight Relationship and Condition Factor of Silver Catfish (Bagrus bayad Forskal, 1775) In Zobe Reservoir, Dutsinma Local Government Area, Katsina State, Nigeria
abstract: Study on length weight relationship and condition factor of Bagrus bayad from Zobe reservoir was conducted from April to July, 2017 to ascertain the growth pattern and the state of well being of the species in the Reservoir. Specimens were obtained on weekly basis from the artisanal fishermen catches at their landing site in the Reservoir, for the period of the study. A total of 296 fish sample comprising of 145 males and 151 females were analysed. The result showed that the species exhibited negative allometric growth pattern with regression exponent b values of less than 3, while the correlation coefficient (r) values of 0.94 (males) 0.95 (each for females and combined sexes) revealed a strong positive correlation. The condition factor recorded is more than 1 which is an indication that the species is in good physiological state of well being in the Reservoir

title: Length weight relationship of Mystus tengara (Ham. Buch. 1822) a freshwater catfish of Indian subcontinent
abstract: Length weight relationship is the most commonly used analysis which has been used for several purposes in fisheries field among which estimation of weight from length is the most popular one. The present study has been performed to analyze the length weight relationship of Mystus tengara a freshwater catfish of Indian subcontinent. Total Length and Body Weight of the studied specimens have been observed to vary from 7.2 11.3 cm (male) 7.3 11.7 cm (female) and 3.43 13.63 g (male) 2.83 14.88 g (female) The calculated regression coefficient b values are 2.941, 3.119 and 3.071 for male, female and combined sex, respectively; thus depicting negative allometric growth for male; while positive allometric growth for female and combined sex of this fish species. The correlation coefficient values (0.94, 0.95 and 0.95 for male, female and combined sex, respectively) are suggesting a significant relationship between length and weight of the studied fish. The present study provides the first baseline information on the length weight relationship of M. tengara which will be beneficial for future management of this fish species.

title: Length weight relationship, condition factor and feeding habit of the Silurid Catfish, Bagrus docmak (Forksskal, 1775) in Lake Victoria, Kenya
abstract: Bagrus docmak is a species of the Bagrid catfishes that is indigenous to Lake Victoria, and is an important source of livelihood to communities around the lake. Fish samples were caught using gillnets of mesh sizes 50 mm and 10 mm. The length and weight of individual fish was measured in the field, while stomachs were preserved in 5% formalin and taken to the laboratory for gut content analysis. The overall sex ratio (male: female) was 1.0:1.26 which did not deviate significantly from 1:1 (p 0.05) The length of fish ranged from 12.0 55.0 cm TL and weighed between 20.0 g and 1650.0 g, with mean length and weight of 32.7 cm TL and 351.2 g, respectively. The relative condition factor was 0.97, 1.01 and 1.00 for male, female and combined sexes, respectively. The condition factor was not significantly different in relation to sex of fish and size classes (p .05) The slope b of the length weight relationship was 2.94, 2.94 and 2.90 for females, males and combined sexes, respectively. Analysis of stomach fullness revealed that most of the stomachs were 1/4 full (44.6% while (29.7% were empty. Non empty guts had variety of food items with Caridina, insects and fish remains each contributing the highest (21% proportions. Most stomachs in each size class were 1/4 full, and empty stomachs notably reduced with increased fish size. Juveniles of less than 30 cm TL fed exclusively on Caridina; otherwise with increased size the fish ingested insects, and different fish species such as Barbus, bivalve, Haps, crabs and detritus in variable quantities. This study provides information on the length weight relationship and condition factor of B. docmak useful for its management. Knowledge of its food requirements in the wild can be used to inform feed formulation for its successful culture.

title: Length weight relationship and population dynamics study of the giant catfish (Arius thalassinus) in the Bay of Bengal coast of Bangladesh
abstract: Received 24 November, 2019 Revised 22 December, 2019 Accepted 24 December, 2019 Online 31 December, 2019

title: Estimation of Length Weight Relationship and Proximate Composition of Catfish (Clarias gariepinus Burchell, 1822) from Two Different Culture Facilities
abstract: This study was carried out to determine and compare the proximate composition and length weight relationship of C. gariepinus from two culture systems (earthen and concrete ponds) The fish samples were collected from three fish farms with same cultural condition in different areas of Obio akpor Local Government Area of Rivers State, Nigeria. Result on the length weight relationship revealed that C.gariepinus reared in concrete tank had a total length of 15.50 49.00cm with a mean of 32.71cm and weight of 150 625g, while total length of C. gariepinus reared in the earthen pond ranged from 19.90 58.0cm with a mean of 39.8cm and weight of 195 825g. The T test shows that the total length of earthen pond were significantly higher than the concrete tank and the weight in the earthen pond was significantly higher than the concrete tank. Parameters of proximate composition analysed were moisture, protein, lipid, carbohydrate, ash and fiber from the fish flesh. Protein content showed a significantly higher in the earthen ponds than the concrete tanks. Ash contents varied from 1.5+ 1.66 7.4+ 0.67% in the concrete tanks and were significantly higher than the earthen ponds which ranged from 3.1+ 0.94 4.5+ 2.11% Lipid was significantly higher in earthen ponds than concrete tanks. Generally, the two culture systems have a significant influence on length weight relationship and nutritional value of C. gariepinus. However, C. gariepinus reared in concrete tank had a heavier body weight than earthen pond and also C. gariepinus reared in earthen pond had highest nutritive values than the concrete tank.

title: Length Weight Relationship and Condition Factor of Silver Catfish Chrysichthys nigrodigitatus) from the Lower Reaches of the New Calabar River Niger Delta
abstract: The length weight relationship and condition factor of silver catfish (Chrysichthys nigrodigitatus) from the lower reaches of the New Calabar River, Niger delta were evaluated between the months of July November, 2015. The lowest length frequency (1) through the months was estimated for class (81 85cm)(91 95cm) and (101 105cm) The modal length frequency (78) was estimated for class (36 35cm) The highest number of catch measured was in the month of September with 124 samples and the lowest number of catch was in November with 15 samples. The smallest sample in terms of length was 18.5cm and the longest was 101.0cm. In terms of weight: the largest fish weighed 13,000g, while the smallest was 150g. The lengthweight regression statistics was obtained using a software known as FISAT (FAO ICLARM STOCK) with the mean regression coefficient or length exponent as b=2.080 with range of 1.9797 2.1460. The condition factor index value range from 0.85 1.98(mean K=1.34) Chrysichthys nigrodigitatus exhibited negative allometric growth all through the months. There is a strong association between the length and weight which was in a good condition.

title: A Length Weight Relationship for Pond raised Hybrid Catfish Fingerlings
abstract: A length weight relationship was developed for pond raised hybrid catfish fingerlings, Ictalurus punctatus x Ictalurus furcatus. A total of 4663 fish were sampled ranging from 20 to 240 mm total length. Predicted weight (g) from length (mm) is based on the equation: Y 0.000017311X2.868474309 (r2 0.996) where Y is the estimated individual fish weight and X is measured total length. The predicted values generated by this model differ from, but follow the same general trends seen with channel catfish, I. punctatus, fingerlings and can be used as a baseline for the development of a length weight table for hybrid catfish fingerling production.

title: Length weight relationship, breeding season, sex ratio, maturity and fecundity of the Nile catfish Synodontis schall (Bloch and Schneider, 1801) (Pisces: Mochokidae) in Lake Chamo, Ethiopia
abstract: Length weight relationship and some aspects of reproductive biology of the Nile catfish Synodontis schall (Bloch and Schneider, 1801) in Lake Chamo, Ethiopia were studied from fish sampled in each month during January to December 2010. The relationship between fork length (FL) and total weight of males (TW 0.020FL3.207, R 2 0.965, n 277) females (TW 0.020FL3.248, R 2 0.976, n 407) and the sexes combined (TW 0.020FL3.240, R 2 971, n 684) were curvilinear and statistically significant (ANOVA, P<0.05) The proportion of breeding fish was high between May and September, during which time 46.8% 72.0% of the males and 41.3% 77.9% of the females had ripe gonads. Thus, the months with high proportions of breeding fish were considered as the breeding season of the fish. More number of females was caught in all size classes but sex ratios were significantly different from 1:1 in size classes 30.0 34.9 cm FL and 35.0 39.9 cm FL. The overall male to female sex ratio of 1:1.39 was also significantly different (kh 2 24.71, P<0.001) from the theoretical ratio of 1:1. Size at first maturity of males was 23.1 cm FL while that of females was 26.4 cm FL. Fecundity ranged from 3,500 54,089 eggs with a mean of 21,017 eggs. The mean relative fecundity of S. schall was 76.1 eggs g 1 of body weight. The average number of eggs g 1 of ovary (preserved wet weight) ranged from 983 to 3,797 with a mean of 1,847 eggs g 1 The relationships between fecundity and fork length and fecundity and total weight were curvilinear while the relationship between fecundity and ovary weight was linear.  Breeding season, length weight relationship, sex ratio, size at maturity, fecundity, S. schall, Lake Chamo