Success of nursing ide (Leuciscus idus, L.) fry related to the period of feeding with live food

Abstract

The ide Leuciscus idus (Linnaeus 1758) belongs to autochthonous, less frequent and vulnerable fish species in the frame of ichthyofauna of the Czech Republic. It was the reason for testing the possibility of captive breeding and production of fry in a controlled environment. The goal of this paper was to find the optimal transfer time of ide larvae from live food (Artemia salina nauplii) to dry starter feed providing good survival and growth. At the end of the experiment, high values of cumulative survival (in percentages) and individual weight (in milligrammes) were found for ide fry in groups D (90.6%, 178.6 mg; 15 days A. salina + 10 days starter feed), A (89.9%, 169.9 mg; A. salina only) and C (88.6%, 160.4 mg; 10 days A. salina + 15 days starter feed). Significantly lower values of the given parameters were found in group B (57.1%, 92.6 mg; 5 days A. salina + 20 days starter feed), and the lowest ones were in group E (29.8%, 75.6 mg; starter feed only). Mean values of the level of ontogenesis at the end of the experiment in fry of A-E groups were analogous to length and weight growth. Groups D, C and A consisted of juveniles only (J1, J2), and groups B and E consisted of larvae and juveniles (L4, L5, L6, J1, J2). Condition and production parameters [Fulton's coefficient of condition (FWC), total length (TL), weight (w), specific growth rate (SGR), food conversion ratio (FCR), cumulative survival] and relationships between basic lengths TL, fork length (FL) and standard length (SL) were evaluated.

Early development and allometric growth patterns in ide Leuciscus idus (Linnaeus 1758)

“…This also applies to ide Leuciscus idus (L.) to a considerable extent – as one of the large riverine cyprinids inhabiting ecosystems across Europe (Maitland and Campbell, ). This reflects the need to enhance the wild fish populations of this species as well as its economic importance, especially in Central and Eastern Europe, where production of this species is a very important part of the diversification of aquaculture production (Hamáčková et al., ; Krejszeff et al., ). This species has considerable value in sport fishing as well as being an ornamental fish (Golden ide – Leuciscus idus melanotus ).…”

“…Despite numerous data published on the identification of the basic rearing conditions for ide larvae (Hamáčková et al., ; Kwiatkowski et al., ; Kupren et al., ,b; Shiri Harzevili et al., ; Gomułka et al., ), a detailed analysis of morphological changes during the larval stages of ide has not been previously reported. The existing papers devoted to the issue either are either too general or are devoted to the short period of a few days immediately after hatching (Kryzhanovskij, ; Cala, ; Florez, ; Koblickaya, ; Kupren et al., ).…”

The effects of cadmium and copper on embryonic and larval development of ide Leuciscus idus L.

“…Spawning takes place from April to June at sandy or gravel spawning substrate. According to Hamackova et al (2007), in some European countries (e.g., Czech Republic), the ide belongs to less frequent and vulnerable species; thus, it is bred in captivity and reared under controlled conditions. Also, in Poland, natural populations of many rheophilic fish including the ide are dwindling due to environment deterioration, and the fish are artificially reproduced and prereared under hatchery conditions (Wolnicki and Górny 1995) and cultured in carp farms (Cieśla and Wojda 2004; Krejszeff et al 2009).…”

Procedure for Harmless Estimation of Fish Larvae Weight

“…Depending on the author, WBWs of larvae recorded on the day when exogenous feeding started ranged from 1.64 to 5.40 mg with body lengths from 7.65 to 8.75 mm (Wolnicki and Górny, 1995;Kujawa, 2004; Krejszeff et al Kujawa et al, 2000;Shiri Harzevili et al, 2004;Hamáčková et al, 2007;Kwiatkowski et al, 2008;Kupren et al, 2011; and the present publication) ( Table 2). The reasons for such discrepancies in WBW could be related to the method of drying the larvae.…”