Comparative efficacy of carp pituitary extract and Ovaprim during captive breeding of Cat Fish, Pabda (Ompok pabda).

Abstract

Ompok pabda, popularly known as "Butter cat fish", is a freshwater species native to India, Bangladesh, Pakistan, and Myanmar. This species is an indigenous catfish belongs to the family Siluridae of the order Siluriformes. It is listed as endangered fish species [1][2][3][4]. The fish has a wide geographical distribution covering Afghanistan, Bangladesh, Myanmar, the Indus plain and adjoining hill area of Pakistan, the North East States of India particularly in Bihar and West Bengal during the early 1970s. Due to rich lipo-protein content and soft bony structure this fish species is considered delicious and nutritious to the people of East India, North East India and Bangladesh as well [5][6][7][8].This species occurs in the lotic and fresh water ecosystem [1,9]. Also available in beels/mauns connected with rivers. In nature the fish breeds in rivers, reservoirs and water sheds, while in flooded condition during south west monsoon. However, in the early 1980s sharp decline in occurrence and abundance were observed [10,11]. Despite its greater economic value this species did not receive sufficient attention in aquaculture. Meager occurrence of live samples in nature and poor survival of the larvae are major constrains of the observations [12]. As a result of indiscriminate fishing during monsoon, application of pesticide in agriculture, soil erosion and siltation formation in river, contamination of habit due to sewage and industrial pollution etc. The population of this species is sharply reduced [13,14].The catfish belongs to the genus Ompok (La Cepede, 1803), mainly consists of medium-sized silurid fishes found in inland waters throughout South and Southeast Asia. The genus is traditionally diagnosed by the presence of a short dorsal fin with 4 rays, strongly forked caudal fin, subcutaneous eye, set immediately posterior to the mouth rectus and two patches of palatal teeth [15]. Born Busch showed that Ompok, as currently understood, is probably paraphyletic [16], distinguished by relatively short maxillary barbells (not extending beyond tip of pectoral fin) and 48-54 branched anal-fin rays. Males are slenderer and have strong serrations on the posterior edge of the pectoral spine (females lack these serrations). Ompok pabda is highly priced, delicious, good taste, fine flesh with soft meat texture and high nutritional value and well preferred fish as possess relatively few bones. This species is silvery in color with two one at distinguished spots, shoulder and another close to the base of tail; longitudinal stripes of dark color often present on the sides of the body. This species which attains a length of 24 cm is caught in fairly large numbers and as a nourishing food fish especially for invalids; it fetches a very high price. The price is above Rs. 300/-per kg (US $1= Rs.52/-). Captive breeding was conducted to compare the efficacy of CPE and Ovaprim on O. pabda and it was observed that both the inducing agents were quite effective. However, R 3 (CPE) dose (5 mg/kg bd.wt. to male and 16 mg/kg bd.wt. to fem...

Comparative Study on the Natural and Synthetic Hormones ofClarias gariepinus Broodstock

“…Meanwhile, other factors include water current, light, pH, temperature, and the degree of rainfall. The pituitary extract gave a higher percentage of fertilization in this study, this was not in agreement with the report of (Chattopadhyay, 2018) who reported a low fertilization rate in C. gariepinus induced with pituitary extract.…”

“…This agreed with (Hossain et al 2012) who worked on C. gariepinus fish induced with synthetic and natural hormone. The broodstock induced with pituitary gland had higher survival (82.31%) after six weeks compared to the broodstock induced with ovaprim (79.68%), this agreed with (Chattopadhyay, 2018) The growth of the larvae monitored for six weeks revealed a significant difference (P<0.05) among the treatments at the early stage, meanwhile, there was no significant difference in the SGR and RGR, this agreed with (Abdul et al, 2017) who recorded a similar growth rate after the feeding trial for 28 days, the same trend was reported by Ndimele and Owodeinde (2012). However, Ikechukwu et al (2019) explained that the growth among the fishes treated with ovaprim and pituitary gland extract was not significantly different.…”