captive condition
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Author(s):  
Nao Ota

Niche partitioning is often vital for the coexistence of ecologically similar species under limited resources. Here I will report the nesting strategy of the two sympatric songbirds and the species differences, which have been overlooked in the past. Blue-capped and red-cheeked cordon-bleus are socially monogamous, biparental songbirds (family Estrildidae) that sympatrically inhabit East Africa. My field observation during their breeding season revealed that red-cheeked cordon-bleus build their nests near wasp nests more frequently than blue-capped cordon-bleus. Blue-capped cordon-bleus instead tended to take over weaver’s old nest more often or use a broader range of nesting materials compared to red-cheeked cordon-bleus. These nesting strategies are already described in the literature as common behaviors in both species. However, the species differences of the adopting strategies have never been reported. While Estrildid finches are one of the best well-studied bird families of their behavior under the captive condition, my finding suggests that we still have limited knowledge of their wild behaviors and ecological plausibility, which is required to understand the functions and evolution.


Author(s):  
Abu Bakker Siddique Khan ◽  
Mousumi Akhter ◽  
Aovijite Bosu ◽  
Shawon Ahmmed ◽  
Md. Mohsin Ali

Aims: The study aimed to develop brood stock of Magur (Clarias batrachus), artificial breeding and seed production under captive condition using growth hormones in north-eastern Bangladesh. Study Design: Fifteen pairs of brood Clarias batrachus were used in this experiment. Brood fishes were reared up to maturation for spawning operation in the farm by providing artificial diet for 4-5 months before onset of breeding season. In the present experiment, the brood fishes were induced with three growth hormones viz., Ovupin (100 mg dompridone and 0.2 mg S-GnRHa) at the rate of 1 ml.kg-1 body weight, Flash (20 mg S-GnRHa, 10 mg dompridone IP and propylene glycol) at the rate of 1 ml.kg-1 body weight and Human Chorionic Gonadotropin (HCG) hormone at the rate of 2272 IU.kg-1 body weight; respectively. The broods were injected with single injection in all treatments. Place and Duration of Study: The present study was conducted on induced spawning of Magur (Clarias batrachus) at the Reliance Aqua Farm, Boilor, Trisal of Mymensingh district from March to August, 2016. Methodology: Sexually mature healthy, uninjured male and female fishes were collected from the broodstock ponds for induced breeding. The fishes were transferred in the clean and germ free conditioning tanks for about 6-7 hours. During conditioning, continuous splash of water was given by keeping the male and female separate. The fishes were then weighed individually and injected intramuscularly with Ovupin, Flash and HCG hormone respectively. Only females were injected at 45° angle of the caudal peduncle. About 23-24 hours of post-injection the testes from males were dissected and mixed with stripping eggs for fertilization. Results: The incubation period for fertilized eggs were 23-24 hours for all the treatments. Fertilization rates were 78.20±0.52, 93.09±0.61 and 81.60±0.97 % and hatching rates were 54.93±0.61, 75.77±0.47 and 64.41±0.71 % in Ovupin, Flash and HCG treatments, respectively. Conclusion: This study revealed higher fertilization (93.09 %) and hatching (75.77 %) rate was achieved with Flash hormone. Therefore, Flash hormone could be effective for the artificial breeding and seed production of Magur (Clarias batrachus).


Aquaculture ◽  
2021 ◽  
Vol 536 ◽  
pp. 736417
Author(s):  
Misha Soman ◽  
Narinder Kumar Chadha ◽  
K. Madhu ◽  
Rema Madhu ◽  
Paramita Banerjee Sawant ◽  
...  

Author(s):  
Mahadevi . ◽  
S Felix ◽  
B Ahilan ◽  
C.B.T Rajagopalasamy ◽  
T.L.S Samuel Moses

In the present study, induced breeding of endemic barb, Dawkinsia filamentosa was carried out using three different synthetic hormones namely Human chorionic gonadotropin (HCG), WOVA-FH and Ovatide at different (0.3, 0.5, 0.7 and 0.9 ml/Kg) doses. All synthetic hormones showed good performance at 0.7 ml/kg body weight. Comparatively WOVA-FH showed better performance with higher number of spawned eggs (1405±5.74 nos/female) and hatching rate (90±0.6%). The study concluded that WOVA-FH at 0.7 ml/kg is an ideal for induced breeding of D. filamentosa. Fertilised eggs were golden in colour with an orange tinge. Hatching took place 34- 36 hrs (26±0.50C) of post fertilization. Yolk sac remained up to 60 hrs of post hatching. Complete developmental stages of D. filamentosa from egg to adult were recorded in captive condition. The present study aids in introducing hatchery-bred seeds of valuable indigenous fish Dawkinsia filamentosa into the ornamental fish trade. Availability of hatchery seed may reduce the wild exploitation and contributes to the conservation of the natural resources.


2020 ◽  
Vol 36 (1) ◽  
pp. 23-31
Author(s):  
Gomathi P ◽  
Anil M K ◽  
Raheem P K ◽  
P. Neethu Raj ◽  
M. V. Rohini Krishna ◽  
...  

ZOO-Journal ◽  
2019 ◽  
Vol 5 ◽  
pp. 82-84
Author(s):  
Bidhya S Jha ◽  
Sirsiya Neupane

Induced breeding is a scientific approach to the modern fish breeding procedure whereby ripen brood fishes are stimulated to release the eggs by pituitary hormone or any other synthetic hormone to breed in captive condition. Fish pituitary is mainly used for induced breeding but due to difficulties in the preparation of injections and preservation, nowdays synthetic hormones like LHRH-a, Ovaprim, WOVA-FH, Ovatide etc. are found to be used for induced breeding. A total of 4 sets of female grass carp were used for induced breeding with application of LHRH-a and pituitary extract in April at Mandal Fish Hatchery, Rupandehi. In total 23,67,500 eggs were collected and incubated. Fecundity, fertility and hatching rates were 1,25,000, 40-70% and 60-70% respectively. The rate of breeding especially, fertilization and hatching rate with LHRH-a was found better than with pituitary extracts.


2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Partha Sarathi Tripathy ◽  
Ningthoujam Chaoba Devi ◽  
Janmejay Parhi ◽  
Himanshu Priyadarshi ◽  
Arun Bhai Patel ◽  
...  

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