Comparative study on milt quality features of different finfish species

Abstract

<p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 8.0px Verdana;">The aim of this research was to study the main sperm characteristics of three different finfish species. Twenty-one gilt-<span style="font: 12.0px Helvetica;">&nbsp;</span></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 8.0px Verdana;">head sea bream (<em>Sparus aurata</em>), 20 brown trout (<em>Salmo trutta</em>, morpha fario) and 15 rainbow trout (<em>Oncorhynchus</em><span style="font: 12.0px Helvetica;">&nbsp;</span></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 8.0px Verdana;"><em>mykiss</em>) male broodstocks, farmed under optimal conditions for each species and fed standard diets for broodstocks, were<span style="font: 12.0px Helvetica;">&nbsp;</span></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 8.0px Verdana;">manually stripped. Brown trout yielded small amounts of sperm (4.5 <em>vs</em>18.13 ml) that were very concentrated (<span style="font: 8.0px Symbol;">&cong;</span>8.5 x<span style="font: 12.0px Helvetica;">&nbsp;</span></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 8.0px Verdana;">10<span style="font: 7.0px Verdana;">9</span><span style="font: 12.0px Helvetica;"> </span>vs 1.24 x 10<span style="font: 7.0px Verdana;">9</span><span style="font: 12.0px Helvetica;"> </span>Szoa/ml) with respect to the other species. The duration of spermatozoan motility for gilthead sea<span style="font: 12.0px Helvetica;">&nbsp;</span></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 8.0px Verdana;">bream sperm was significantly longer (almost 50 min), in comparison to the one-minute motility of Salmonids. Single<span style="font: 12.0px Helvetica;">&nbsp;</span></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 8.0px Verdana;">fatty acids of brown trout sperm were higher than in the other two species for almost all detected fatty acids. In partic-<span style="font: 12.0px Helvetica;">&nbsp;</span></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 8.0px Verdana;">ular, eicosapentaenoic acid (EPA) was at least three times more concentrated in brown trout than in rainbow trout or gilt-<span style="font: 12.0px Helvetica;">&nbsp;</span></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 8.0px Verdana;">head sea bream sperm (1238.3 <span style="font: 8.0px Symbol;">&micro;</span>g/g <em>vs</em>305.6 and 333.3 <span style="font: 8.0px Symbol;">&micro;</span>g/g, respectively; P < 0.01). Saturated, polyunsaturated and<span style="font: 12.0px Helvetica;">&nbsp;</span></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 8.0px Verdana;">total unsaturated fatty acid classes were significantly higher in brown trout sperm than in the other two species - almost<span style="font: 12.0px Helvetica;">&nbsp;</span></p> <p style="margin: 0.0px 0.0px 0.0px 0.0px; font: 8.0px Verdana;">double with respect to gilthead sea bream sperm and more than double in comparison to RT sperm (P < 0.01).<span style="font: 12.0px Helvetica;">&nbsp;</span></p><div><span style="font-family: Helvetica, Arial, Helvetica, sans-serif; font-size: small;"...

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“…In this study the sperm motility values were similar to those obtained in Brown trout (Bozkurt et al, 2006(Bozkurt et al, , 2006b(Bozkurt et al, , 2011Hatipoğlu and Akçay, 2010) and in Rainbow trout (Bozkurt et al, 2005(Bozkurt et al, , 2006cAral et al, 2007;Canyurt and Akhan, 2008), while higher values were found in Brown trout by Rainis et al (2005) and in O. mykiss (Glogowski et al, 2000;Rainis et al, 2005;Şahin et al, 2013).…”

“…This is expected in spawning ground frequented by a wild population characterized by consistent variability of biological, life-history that is, the extant of migration, and growth-rate among individuals (Rudolfsen et al, 2006). Previous studies have shown that sperm quality, depends on male age, season, exposure to female hormones, frequency of stripping (or reproductive events), feeding level and quality of their diet or rearing conditions both in wild and farmed stocks (Springate et al, 1985;McNiven et al, 1992;Rainis et al, 2005).…”

Sexual Maturation and Milt Quality of the San Pedro Mártir Trout Using an Artificial Photoperiod

“…The volume of semen obtained in this work (165-228 µL per organism) was slightly higher than that obtained from mature wild males in the field (∼100-200 µL per organism; personal observations). However, the milt volumes and sperm concentrations observed in cultured male rainbow trout by Piironen and Hyvärinen (1983), Bastardo et al (2004), Rains et al (2005), and Bozkurt et al (2006) are between one and two orders of magnitude higher than those we obtained. Also, we found that volume, concentration, and motility increased as the spawning season progressed but declined in the last two 283 collections.…”

Sperm quality of Brazilian flounder Paralichthys orbignyanus throughout the reproductive season

“…Trippel and Morgan (1994) reported the same process for G. morhua , where progressive motility of spermatozoa was observed during a few minutes, while for a long period, only vibrating cells were observed (≅120 min). Rainis, Gasco and Ballestrazzi (2005) found that the total duration of sperm motility for S. aurata was about 50 min, while spermatozoa of rainbow trout Oncorhynchus mykiss (Walbaum) and brown trout Salmo trutta L. are motile for <2 min. According to these authors, the differences in the duration of spermatozoa motility among the species are related to the type of environment where fecundation occurs.…”