EARLY LIFE STAGE LARVAL ONTOGENY AND MORPHOMETRIC MEASUREMENTS IN ORNAMENTAL FISHES


Sepil A., Kankaya E.

in: Su Ürünlerinde Modern Perspektifler, Boran KARATAŞ, Editor, Iksad Publications , Ankara, pp.293-312, 2022

  • Publication Type: Book Chapter / Chapter Research Book
  • Publication Date: 2022
  • Publisher: Iksad Publications
  • City: Ankara
  • Page Numbers: pp.293-312
  • Editors: Boran KARATAŞ, Editor
  • Van Yüzüncü Yıl University Affiliated: Yes

Abstract

Although aquarism is generally regarded as a hobby, it has actually turned into an agricultural sector that attracts millions of people around the world with has a very high economic return in terms of aquaculture (Hekimoğlu, 2006). Therefore, it is very important for the ornamental fisheries sector to ensure the efficient production of aquarium fish species. The highest losses in the production of ornamental fishes occur in the embryonic and larval stages. From this point of view, monitoring the developmental stages of fish eggs and larvae; it is so important to reduce early larval losses, to ensure egg hatching with low mortality rates in the embryo stage and to determine the development of the digestive system in the process up to the post larval stage and to perform feeding practices effectively. Limited enzyme activity and undeveloped or not fully developed digestive system in the early life stage of fishes prevent the digestion of artificial powderbaits. Various zooplankton (Artemia sp., Brachionus plicatilis and infusoria e.g.) are used at this stage. And then the mouth gap size of the larvae determines which of these live baits will be used in the first feeding.Feeding live baits in freshwater and marine fish hatcheries creates high economic costs. This makes it necessary to transition to artificial powder feeds as soon as possible. For example, Person Le Ruyet et al., (1993) reported in a study that making the transition to artificial feeding 15 days earlier in sea bass (Dicentrarchus labrax) larval rearing could result in 80 percent savings in artemia usage rates.