Evaluating quality of Nile tilapia (Oreochromis niloticus) eggs and juveniles from different commercial hatcheries

Abstract

ABSTRACT.Our objective was to assess the quality of eggs and juvenile of Nile tilapia (Oreochromis niloticus) from broodstock of three commercial hatcheries (H1, H2, and H3). Larval weight was significantly higher for H2 and H3 hatcheries (P < 0.05). After 45-day growth, weight of juveniles of H2 was higher, while specific growth rate was significantly higher for H1 and H2 (P < 0.05). After the ammonia stress test, no significant differences in mortality were found among larvae from the three hatcheries, although a positive relationship between carbohydrate content in eggs and juvenile mortality was observed (P < 0.05). After the salinity stress test, the lowest and highest mortality (P < 0.05) occurred respectively in tilapia larvae from the H1 (24.2%) and H3 (57.8%) hatcheries. We concluded that egg quality was not affected by tilapia broodstock from the three hatcheries studied, but differences were obtained for growth performance, carbohydrate content, and survival of juveniles when exposed to the salinity stress test. These three indexes should be considered as potential juvenile quality criteria for tilapia.

Aspects of the growth and reproductive biology of Oreochromis niloticus (Linnaeus, 1758) in a tropical Soda Lake, Lake Shala, Ethiopia

“…But, the mean absolute fecundity of O. niloticus in Lake Shala was higher than a report in Lake Beseka (261 eggs) by Hirpo (2013), Lake Langeno (464 eggs) (Kebede et al, 2018) and Lake Hayq (217 eggs) (Tessema et al, 2019). Cuevas-Rodríguez et al (2017) detailed that the mean absolute fecundity of O. niloticus varies considerably in various factors like abundance and seasonal availability of food and fishing pressure. Body CF and growth of the fish attributed to variation in fecundity of the fish.…”

“…Body CF and growth of the fish attributed to variation in fecundity of the fish. Fish in poor body condition are reported to possess less fecundity potential than those in better condition (Cuevas-Rodríguez et al, 2017;Peña-Mendoza et al, 2005). Identical fish species also can show variations in mean fecundity from one water body to a different water body because of the TL of the fish examined for analysis.…”

Embryonic and Larval Development of Stinging Catfish, Heteropneustes fossilis, in Relation to Climatic and Water Quality Parameters

“…Among the different climatic and water quality parameters, temperature is a fundamental factor that influences other parameters in various ways to affect broodfish reproductive processes, such as growth, maturation, ovulation, breeding, embryonic development, hatching of eggs, and larval and juvenile growth and survival [ 17 ]. In addition to temperature effects, fish embryonic and larval development are critically affected by pH, DO, salinity, ammonia, and other climatic factors [ 18 , 19 , 20 , 21 ]. Fish embryos and larvae are more sensitive to changes in pH than are juveniles and adults [ 22 ].…”

Reproductive traits in different Nile tilapia genetic groups

“…Selective breeding of aquatic organisms is a recent technique in Brazil. The first record of a selectively bred organism was in 2002, when Nile tilapia variety Supreme (GenoMar Supreme Tilápia) was imported, with a focus on the exclusive sale of monosex individuals (Cyrino et al, 2004). The GIFT variety (Genetically Improved Farmed Tilapia) was later introduced in year 2005 (30 families), imported by the State University of Maringá (UEM), located in Maringá -PR, Brazil, in a partnership with the World Fish Center (Oliveira et al, 2012).…”

“…Researchers have examined the reproduction of Nile tilapia in the most varied experiments involving reproductive traits of selectively bred (Supreme and Premium Aquabel) and nonselectively bred (Chitralada) varieties (Almeida et al, 2013); establishment of genetic parameters for reproductive traits (fecundity and fertility) (Trong et al, 2013); evaluation of egg quality at different commercial hatcheries (Cuevas-Rodríguez et al, 2017); and determination of protein, energy (Oliveira et al, 2014;Bombardelli et al, 2017;Orlando et al, 2017) andvitamin C (Sarmento et al, 2018) levels to improve fecundity and fertility. However, there are no comparative studies on the most recently selectively bred varieties in Brazil analyzing reproductive factors, the effect of inbreeding on reproductive traits and the effect of crossing between different genetically improved varieties on reproductive traits.…”