ISSN 2348-313X (Print) International Journal of Life Sciences Research ISSN 2348-3148 (online) Vol. 10, Issue 4, pp: (57-63), Month: October - December 2022, Available at: www.researchpublish.com
Effect of temperature on incubation period and hatching of neon tetra Paracheirodon innesi eggs NITESH V. KADTAN1, DR. KIRAN S. SHILLEWAR*2 1
PhD scholar, dept of fishery science *2Head, Department of Fishery Science N.E.S. Science College, Nanded.Dist. Nanded 431 605. DOI: https://doi.org/10.5281/zenodo.7376648
Published Date: 29-November-2022
Abstract: In the commercial development of freshwater ornamental fish culture, provision of appropriate temperature for egg incubation and further development of the fish at various stages is an important aspect in successful attainment of seed production. Little work has been done on the breeding of Paracheirodon innesi. Since, this species is very temperature sensitive, the study was conducted to determine the effect of different temperatures on breeding behaviour, hatchability and larval rearing of P. innesi. Broodstock were fed three times a day with bloodworms, tubifex and cladocerans at 4% body weight. Artificially fertilized eggs of neon tetra P. innesi obtained after spawning of cultured broodstock were incubated at temperatures of 18, 20, 22, 24 and 26 0C in triplicates. The results showed that the optimal temperature for neon tetra embryonic development ranged from 22 to 26 0C. Highest (70 ± 1.9 %) mean hatching percentage of eggs was observed at 26 0C, whereas, the lowest (52.2 ± 4.8%) was observed at 180C (P < 0.05). The incubation period varied inversely with temperature. Eggs took 38 - 40 hours for hatching at 180C while it took only 24 - 26 hours at 260C (P< 0.05). Based on the results of the present experiment, the temperature range of 24 to 26 0C can be recommended as optimum temperature for artificial propagation, larval rearing and higher survival of P. innesi. Keywords: neon tetra, Paracheirodon innesi, temperature, embryonic development, hatching success.
1. INTRODUCTION Ornamental fish keeping is the second most popular hobby in the world after photography and ornamental fishes are the most popular pets liked by people in the world. An estimated one billion ornamental fish are exported annually (Dykman, 2012). The world export value in 2010 was over US$ 350 million and since 1985 the value of international trade in exports of ornamentals has been increasing at an average growth rate of approximately 14% per year. The main exporting countries includes Singapore, Malaysia and Thailand. Brazil and Columbia are also significant exporters. The main importing countries include Germany, Japan, Singapore, the US and the UK. The neon tetra is the most widespread and colourful aquarium fish among the tetras. They are frequently mentioned as aristocrats of the small aquarium. It is also termed as the jewel in the aquarium tank. Their colour is magnificent and a school of neon tetras competing about catching beams of sunlight is quite a sight. Compared with the guppy Poecilia reticulata, the neon tetra has become one of the most popular ornamental fish kept in household. During a single month, an average of 1.8 million of neon tetras, with an estimated value of US$ 175000 were imported by the United States for the aquarium trade (Chapman et al., 1997). The neon tetra is described as 40 mm long, luminously coloured freshwater fish with a dark olive-green back over a silverwhite abdomen. The fish is characterized by a shimmering blue-green lateral body stripe that covers from the head to the base of the adipose fin. A broad, shining red stripe begins at the middle of the body and extends posteriorly to the base of the caudal fin. The fins are transparent and colourless (Myers, 1936). There are three main sister species of neon tetra P. innesi (Myers, 1936), P. axelrodi (Schultz, 1956) and P. simulans (Gery, 1963).
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