Study of Fecundity of Ompok pabo (Hamilton, 1822) an Endangered Fish Species of Tripua, India

Mahaseth

et al. 2020

JANS

Neolissochilus hexagonolepis (McClelland, 1839) is one among the notable species in snow-fed torrential rivers of Nepal. The present study attempts to investigate some reproductive traits of N. hexagonolepis, including the length at first maturity, fecundity and its relationships with biometric variables like lengths (TL, SL, and FL) and weights (TW and OW) of the fish in the mid-reaches of Tamor River, Nepal. A total of 109 fish samples were collected from the river. For each individual, total length (TL), standard length (SL) and fork length (FL) were measured in a fully stretched condition to the nearest 1mm using a measuring tape and graduated ruler, while total weight (TW) and ovary weight (OW) was measured using a digital balance with the precision of 0.01 g. The mean absolute fecundity (F) was 8356.44 ± 4612.59 and ranged from 2398.6 to 20160. SL was more significantly correlated with absolute fecundity (R2=0.59; p<0.001) than other body metrics. The results showed that female individuals of N. hexagonolepis attained the first sexual maturity at TL 32.9 cm. N. hexagonolepis exhibited a protracted breeding period with its ovaries passing through six different stages of maturation. The finding of the present study may serve as a protocol for fishery biologists and managers to promulgate adequate regulations for continual fishery management in the River Tamor, Nepal.

Section: Discussionsupporting

confidence: 91%

Fecundity, histomorphology of the ovary and size at first maturity of Neolissochilus hexagonolepis (McClelland) in Tamor River, Nepal

Mahaseth

et al. 2020

JANS

“…Musa & Bhuiyan [30] also studied Mystus bleekeri collected from the Padma River near the town of Rajshahi. Similarly, differences in fish ovary weight and fecundity according to fish size have been reported for the endangered fish species of Tripua (Ompok pabo) [31], Carassius Carassius from Kashmirdal Lake [32], and Puntius sophore from Upper Assam [33]. In this study, fecundity and ovary weight of all fed fish were affected by fish body size relative to body length and body weight.…”

Section: Discussionsupporting

confidence: 67%

“…External factors such as food availability and environmental parameters such as pH, ammonia levels, dissolved oxygen levels and temperature levels. They have been observed to affect fish fertility [31]. The range of physicochemical parameters (water temperature, dissolved oxygen level, pH, and ammonia level) measured in the tarpaulin ponds in this study did not vary significantly (P > 0.05) and were within recommended tolerances for optimal growth and good health of freshwater fish [35].…”

Section: Discussionmentioning

confidence: 47%

Dietary Probiotic Supplementation; Effects on Fecundity and Relationship with Biometric Parameters of Clarias gariepinus

Eyo,

Ekane

2023

JMR

The implications of probiotics in aquaculture including host health, reproductive development, welfare and nutrition has driven the demand for commercial probiotics for use in aquaculture operations either as feed supplements or through direct application. This study was conducted to evaluate the long-term effects of varying dietary amounts of probiotic supplements on C. gariepinus. Five isonitrogenous diets (42% crude protein) were supplemented with probiotics as follows: Feed A (0 g/kg TPS), Feed B (0.5 g/kg TPS), Feed C (1.0 g/kg TPS), Feed D (1.5 g/kg TPS) and Feed E (2 g/kg TPS) and fed to the experimental fishes in triplicate groups for 38 weeks. Results obtained showed that there was no significant difference in mean fecundity between fish fed the control and probiotic-enriched diets (P > 0.05), with diet B containing 0.5 g/kg Taslyprobiotics having the highest fecundity (61,714.00 ± 4,469.43 eggs) and diet C (1.0 g) having the lowest fecundity (49,568.14 ± 3,920.68 eggs). There was a linear relationship between fecundity of Clarias gariepinus with all body parameters such as body weight, ovary weight, and total length and fecundity of female fish.In addition, a positive and significant correlation was obtained between fecundity and all body parameters. Additionally, there was no uniform increase in fecundity with increasing dietary probiotic inclusion level. In conclusion, probiotics supplementation in diets may boost fecundity but increase in probiotic dietary inclusion level will not result in a corresponding increase in fecundity of C. gariepinus.

The relationship between fish length and otolith size and weight of the two nearly threatened siluriformes species Ailia coila (Ailiidae) and Ompok pabda (Siluridae) collected from the Ganga River at Narora, India

et al. 2022

Relationships between fish length and otolith length, width and mass were investigated in the two nearly threatened silurid species (Siluriformes) Ailia coila (Hamilton, 1822) and Ompok pabda Hamilton, 1822) collected from the Ganga River at Narora, India. The relationships between otolith length (OL) and fish total length (TL), otolith width (OWd) and TL, and otolith weight (OWe) and TL are expressed by linear regression models; for A. coila, OL = 0.0291 TL + 0.8541, OWd = 0.0306 TL + 0.2241, OWe = 0.0246 TL + 0.8595, and for O. pabda, OL=0.0643 TL + 1.3848, OWd = 0.0377 TL + 0.7358, OWe = 0.0461 TL + 0.6761. This study symbolizes the first reference available on the relationship of fish size and otolith size and weight for A. coila and O. pabda in the Ganga River at Narora, India. The data obtained are useful for studying the feeding ecology of these fish, whose numbers are declining due to overfishing.