scholarly journals A comparative study on morphology, growth rate and reproduction of Clarias gariepinus (Burchell, 1822), Heterobranchus longifilis Valenciennes, 1840, and their reciprocal hybrids (Pisces, Clariidae)

1992 ◽  
Vol 40 (1) ◽  
pp. 59-79 ◽  
Author(s):  
M. Legendre ◽  
G. G. Teugels ◽  
C. Cauty ◽  
B. Jalabert
Keyword(s):  
Growth Rate ◽  
Comparative Study ◽  
Clarias Gariepinus ◽  
Reciprocal Hybrids ◽  
Heterobranchus Longifilis

A comparative study on the nursery culture of hatchery-reared sub-adult cupped oyster, Crassostrea iredalei (Faustino, 1932), in an earthen pond and a mangrove canal

2018 ◽  
Vol 26 (4) ◽  
pp. 217-222
Author(s):  
Premwadee Chueachat ◽  
Woraporn Tarangkoon ◽  
Suwat Tanyaros
Keyword(s):  
Growth Rate ◽  
Comparative Study ◽  
Condition Index ◽  
Daily Growth ◽  
Nursery Culture ◽  
Absolute Growth Rate ◽  
Significant Difference ◽  
Adult Oyster ◽  
Absolute Growth ◽  
The Mean

Abstract A comparative study on the nursery culture of the spat of the tropical oyster, Crassostrea iredalei, in an earthen pond and a mangrove canal was conducted over two months. The results revealed no differences in the absolute growth rate determined by shell width between the two culture sites (P < 0.05). Sub-adult oysters cultured in the mangrove canal showed a higher absolute growth rate in shell length and a higher daily growth rate than the oysters cultured in the earthen pond (P < 0.05). The mean survival rate of sub-adult oysters cultured in the earthen pond (99.8 ± 0.2%) was significantly higher than for those cultured in the mangrove canal (66.7 ± 31.4%). Decreased density from the loss of sub-adult oyster nursery culture in the mangrove canal led to higher growth performance than in the earthen pond. However, no difference was found for the fraction of oysters larger or smaller than 5 cm for the two culture sites (P < 0.05). A significant difference was noted in the Condition Index (CI) between the two culture sites (P < 0.05). The high primary productivity in mangroves is a major supporter of higher CI in sub-adult oysters cultured in mangrove canals versus in earthen ponds. Water exchange in the earthen pond to maintain calcium and magnesium concentrations resulted in no differences in the shell compressibility of sub-adult oysters compared with those cultured in the mangrove canal.

scholarly journals Substitution of soyabean meal with bioactive yeast in the diet of Clarias gariepinus: Effect on growth rate, haematological and biochemical profile

2012 ◽  
Vol 11 (91) ◽  
pp. 15802-15810 ◽  
Author(s):  
Evelyn Ezenwaji Ngozi ◽  
Iluno Ada ◽  
Atama Chinedu ◽  
Onyekachi Nwaigwe Chukwuemeka ◽  
Uchenna Nwaigwe Chioma
Keyword(s):  
Growth Rate ◽  
Clarias Gariepinus ◽  
Biochemical Profile ◽  
Soyabean Meal ◽  
Effect On Growth

Intraracial variation in Phytophthora infestans, and its relationship to different host varieties

1969 ◽  
Vol 47 (6) ◽  
pp. 863-867 ◽  
Author(s):  
Alan Upshall
Keyword(s):  
Growth Rate ◽  
Comparative Study ◽  
Phytophthora Infestans ◽  
Resistant Variety ◽  
Rate Variation ◽  
Low Field

A comparative study of the magnitude of growth rate variation among isolates of Phytophthora infestans (Mont.) de Bary taken from a high and a low field resistant variety of potato has shown it to be greater in the former than in the latter, even though both crops were infected by the same population of the pathogen. Competition between spores, and adaptation to the varieties, are put forward as possible alternative explanations.

scholarly journals Performance characteristics of African Cat fish (Clarias gariepinus) fed varying inclusion levels of silk worm pupae (Anaphe infracta)

2013 ◽  
Vol 42 (1) ◽  
pp. 76-80
Author(s):  
CO Olaniyi ◽  
GO Babasanmi
Keyword(s):  
Growth Rate ◽  
Weight Gain ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Clarias Gariepinus ◽  
Conversion Ratio ◽  
Feed Conversion Ratio ◽  
Feed Conversion ◽  
Complete Replacement ◽  
Silk Worm

The use of Silkworm (Anaphe infracta) pupae as a protein source was investigated for its ability to replace fishmeal in the diet of Clarias gariepinus, African cat fish. Five dried diets formulated at 40% crude protein were fed to fingerlings of an average initial weight of 14.33g at 0 (control diet), 25, 50, 75 and 100% inclusion levels of silk worm meal. The experiment was conducted for 84 days were measured. Mean weight gain (MWG), specific growth rate (SGR), feed conversion ratio (FCR). The five inclusion levels of silk worm pupae supported the growth of Clarias gariepinus fingerlings, the growth and feed utilization were favoured by high inclusion level of silk worm meal. Significant differences (p<0.05) were observed among the treatments, although there were no significant differences (p>0.05) in the growth parameters between 50% and 75% inclusion levels. The 100% silk worm pupae meal inclusion gave the best final mean weight gain of 10.29g specific growth rate of 0.93%, feed conversion ratio of 2.18 and protein efficiency ratio (PER) of 0.012. The carcass protein and lipid contents increased compared to the levels of both at the beginning of the experiment. Even though, there were no significant differences (p>0.05) among proximate composition of the fish groups fed 25, 50 and 75%. The results showed that diet consists of 100% silk worm meal could be used as a complete replacement for fish meal in the diet formulation for Clarias gariepinus fingerlings. DOI: http://dx.doi.org/10.3329/bjas.v42i1.15787 Bang. J. Anim. Sci. 2013. 42 (1): 76-80

scholarly journals Length-weight relationship and condition factor of Clariid fish species in Kano Rivers, Kano State, Nigeria

2021 ◽  
Vol 44 (3) ◽  
pp. 135-139
Author(s):  
I. O. Suleiman ◽  
G.N. Akpa ◽  
P. I. Bolorunduro
Keyword(s):  
Body Weight ◽  
Condition Factor ◽  
Clarias Gariepinus ◽  
Water System ◽  
Well Being ◽  
Weight Relationship ◽  
Tropical Water ◽  
Fish Samples ◽  
Heterobranchus Longifilis ◽  
State Body

Fish found in natural tropical and sub-tropical water system experience frequent growth fluctuations. The study was conducted to determine the length-weight relationship and condition factor of Clariid species (Clarias gariepinus, Heterobranchus longifilis and Synodontis clarias) in Kano state of Nigeria. About 177 fish samples were collected from six rivers (Thomas, Ghari, Tiga, Duddurun-Gaya, Karaye and Bagwai) across the length and breadth of Kano state. Body weight (BW=248.48g), total length (TL=32.74cm) and standard length (SL=26.16cm) were determined. The length-weight relationship and condition factors were also determined. The condition factors showed varying degree of well-being of fish sampled from their habitat, and ranged from K = 0.37 to 0.89. The equation for the lengthweight relationship for the three strains is: C. gariepinus = -329.86+17.56TL, H. longifilis = -241.49+14.28TL and C. clarias = -428.51+22.72TL. Body weight and length had positive and significant relationship (r = 0.73 TL; r = 0.75 SL).

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