Influence of thermal conditions on successful ide (Leuciscus idusL.) artificial reproduction during spawning season

Abstract

Two forms of ide Leuciscus idus (L.) spawners: wild-coloured and ornamental: yellowcoloured were kept at three various temperature regimes shortly before spawning at optimal temperature regimes (group 1), under natural temperature conditions (group 2) and in rapidly increasing temperature (group 3). The quality and quantity of collected semen, ovulation rate and survival rate of embryos to the eyed-egg-stage were recorded. The quality of semen from group 3 (where the temperature increased over the thermal spawning optimum) was the worst (46 and 51% motility of spermatozoa for the wild-coloured and yellow form, respectively). The quantity of collected semen also was the lowest in the same groups (1.1 and 1.0 cm 3 kg -1 for the wild-coloured and yellow form, respectively). Increasing the temperature to 16°C also caused a decreasing percentage of ovulated females (70% and 60% of ovulation for wild-coloured and yellow form, respectively) and biological quality of eggs (48.9 and 47.8% embryo survival for wildcoloured and yellow form, respectively). Fluctuations of temperature at a level of 8-14°C (group 2) did not negatively affect spawning results, except for a longer latency time (over 44 hrs). The results suggest that the temperature regime shortly before controlled reproduction of ide plays an important role influencing reproductive success.

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“…The lowest ovulation rate among the study groups was observed after administering hCG. These findings are consistent with those observed in in-season barbel reproduction (Targońska et al, 2011a) as well as in that of other batch-spawning cyprinids (Kucharczyk et al, 1997c;Targońska and Kucharczyk, 2011;Targońska et al, 2012b;Kujawa et al, 2013). As in other species, embryo survival rate after this measure was applied was the highest, although it was not statistically different than observed after Ovaprim was administered.…”

“…This applies both to fish with one-off spawning during the season, such as common dace (Leuciscus leuciscus (L.)), carp (Cyprinus carpio L.), ide, asp and batch-spawning fish, such as common tench (Tinca tinca (L.)), crucian carp (Carassius carassius (L.)) or rudd (Scardinius erythrophthalmus L.) (Kucharczyk 1997a,b,c;Brzuska 2005Brzuska , 2006Podhorec and Kouril, 2009;Targońska et al, 2012b;Nowosad et al, 2014a). Only in domesticated fish can spawn be obtained without hormonal stimulation, but this is not always the case (Krejszeff et al, , 2010Targońska et al, 2011a). Hormonal stimulation is applied differently in two groups of cyprinid fish (Podhorec and Kouril, 2009).…”

Controlled reproduction of the crucian carp Carassius carassius (L.) combining temperature and hormonal treatment in spawners

“…Similar findings have been reported for asp and ide by Targońska et al. (, ). However, only excessive high temperature adversely affected the reproduction outcome.…”

“…The effectiveness of reproduction protocols, expressed as ovulation rate, fecundity, as well as gametes and larvae quality, will depend on how we determine the optimum conditions for a number of key factors: the level of domestication (Krejszeff et al., ), fish origin (e.g. differences between populations) (Krejszeff et al., , ), feeding regime of spawners (Henrotte et al., ) as well as the type of hormonal preparation employed to stimulate final maturation (Bonnet et al., ; Targońska et al., ). It has also been reported that manipulation of environmental conditions may significantly affect egg quality (Bonnet et al., ).…”

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“…Low quality of gametes and low viability of offspring are the result of improperly prepared protocols Targońska et al, 2008). This is caused, among other factors, by thermal regimes during the pre-spawning period (Targońska et al, , 2011b, time and methods undertaken to handle the spawners, spawning agent used (Brzuska, 2006;Yaron et al, 2009;Cejko et al, 2012), differences among populations (Targońska-Dietrich et al, 2004;Krejszeff et al, 2010) and domestication level (Krejszeff et al, 2009;Cieśla, 2014). Thus, it is very important to re-examine the effectiveness of the proposed methods on different species and populations to improve the knowledge of fish reproduction.…”