Dietary effect on fry production and growth performance of sailfin molly, Poecilia latipinna, in salt water
| Autor: | Kumaraguru Vasagam, K.P., Shanmugam, A., Rajagopal, S. |
|---|---|
| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Acta Ichthyologica et Piscatoria 37(1): 29-35 |
| ISSN: | 1734-1515 0137-1592 |
| DOI: | 10.3750/aip2007.37.1.05 |
| Popis: | Three of the top 10 species of ornamental fishes imported into the USA are viviparous cyprinodontids of the family Poeciliidae. In India poeciliids account for fifty percent of the market share in ornamental fishes (Mahapatra et al. 2000, Ramachandran 2002). The livebearing Poecilia latipinna (Lesueur), commonly known, as the sailfin molly is a popular ornamental fish bred commercially in many countries, including tropical India (Ghosh et al. 2003, Ramachandran 2002). In view of its hardy nature and ease of breeding in simple holding facilities, this fish is highly recommended for beginners in ornamental fish breeding and, especially in India, for women’s self-help groups trained in entrepreneurship (authors’ unpublished observation). Although this fish thrives in a wide range of salinities (0–94.6‰), pure freshwater is not suitable, especially for healthy breeding (Kristensen 1969, Whitern 1983, Nordlie and Mirandi 1996, Haney and Walsh 2003, Kumaraguru vasagam et al. 2005). Wild fishes of the genus Poecilia (guppies and mollies) are generally found in freshand brackish water bodies such as streams, rivers, ponds, and estuaries (Nordlie et al. 1992). Salt is conventionally added to molly tanks to induce breeding (Whitern 1983). Use of mollies in breakthrough in marine aquaria (a process to augment nitrifying bacteria initially) has become common. Osmoregulation is an energy demanding metabolic process. Iso-osmotic salinities minimize osmoregulatory stress and associated energy costs, thereby increasing the energy available for growth and survival (Sampaio and Bianchini 2002). This is evidenced in P. latipinna by better breeding and growth performance at 25‰ (Kumaraguru vasagam et al. 2005). Euryhaline marine fish larvae also show better growth and survival in iso-osmotic salinities (Tandler and Helps 1985, Mihelakakis and Kitjima 1994). Nutrition has a profound effect upon gonadal development and fry production in fish (Watanabe 1985). Fry production is generally positively related to body size, ACTA ICHTHYOLOGICA ET PISCATORIA (2007) 37 (1): 29–35 |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|