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Title: Growth and reproduction in the marine silverside Odonthestes regia Humboldt 1821 (Pisces: Atherinidae) from southern Chile and its potential for aquaculture
Author: Orellana Touzery, F. A.
Awarding Body: University of Wales Swansea
Current Institution: Swansea University
Date of Award: 2005
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The marine silverside Odonthesthes regia is an atherinid fish highly appreciated in South America, especially in Peru and Chile where it is considered a fish of first quality. This thesis reports research into basic biological aspects that could be useful to the establishment of future cultures of this species. Capture of specimens in the wild, transportation, acclimatization and conditioning to confined systems are detailed. Odonthesthes regia adapts easily to confinement; conditioning of the brood stock is achieved with photoperiod stimulation, and a ripe female can produce between 4500 and 7500 eggs. Incubation period lasted 31.51 days or 391.397 ATU (Accumulated Thermal Units) with an average temperature of 12.43 Co. No significant differences in weight and length were observed between larvae fed with enriched and non-enriched Artemia. Larvae showed better performance in terms of growth and survival in salinities below the values for fully marine environments (5 o/oo to 15 0/00). They are morphologically adapted to consume artificial diet pellets, with particle diameter no greater than 0.6 mm, from day 7 after hatching and can be placed under a feeding regime based only on artificial diets from day 30 after hatching. Juveniles reared in a sea cage system performed well and adapted rapidly to this type of confinement. Values for growth and mortality obtained over a period of 12 months are similar to those observed in other marine fishes cultivated at industrial scales. The main obstacles to the future cultivation of this fish are related to the possibility of producing an artificial feed less dependent on fishmeal, and especially formulated for its nutritional and energetic requirements, and to the development of demanding markets to stimulate the business.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available