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THE IMPORTANCE of the CHILIA BRANCH for PROTECTING and at the Moment of Catch

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THE IMPORTANCE of the CHILIA BRANCH for PROTECTING and at the Moment of Catch Scientific Papers. Series D. Animal Science. Vol. LX, 2017 spawning, was very good. The mortality in all ACKNOWLEDGEMENTS ISSN 2285-5750; ISSN CD-ROM 2285-5769; ISSN Online 2393-2260; ISSN-L 2285-5750 groups was less than 10%. All males have started the spermiation process This study was supported by Project No. 10.1.1 THE IMPORTANCE OF THE CHILIA BRANCH FOR PROTECTING AND at the moment of catch. In the present financed by Sectoral Plan of the Ministry of CONSERVATION OF THE ANADROMOUS MIGRATORY STURGEONS experiment, the hormonal treatment resulted in Agriculture and Rural Development. a significantly higher production of milt. Tiberius-Marcel DANALACHE1, Stefan DIACONESCU1, Alin Marius BADILITA2, Ovulation in females from the experimental REFERENCES György DEÁK2, Elena HOLBAN2, Carmen Georgeta NICOLAE1 groups was synchronous. The short time Costache M., Bucur C., Radu D., Oprea D., Costache M., between the first and last ovulation, observed in 1University of Agronomic Sciences and Veterinary Medicine of Bucharest, all the experiments, may be the result of the Nicolae C. G., 2012. Research on sperm quality of north american sturgeon species Polyodon spathula. 59 Marasti Blvd, District 1, Bucharest, Romania 2 high level of synchronous oocyte maturation. Scientific Papers. Series D. Animal Science, LV: National Institute for Research and Development in Environmental Protection, Bucharest - The survival of perch spawners throughout the 306-311. INCDPM, Spl. Independentei, 294, 6th District, Code 060031, Bucharest, Romania Dabrowski K., Ciereszko A., Ramseyer L., Culver D., experiment was high (Dabrowski et al., 1994) Kestemont P., 1994. Effects of hormonal treatment and (Gillet et al., 1995) reported some Corresponding author e-mail: [email protected] problems with spawner survival, especially the on induced spermation and ovulation in the yellow perch (Perca flavescens). Aquaculture 120: 171-180. females. The similar size of the perch spawners Dabrowski K., Ciereszko R.E., Ciereszko A., Toth G.P., Abstract used may have also resulted in synchronous Christ S.A., El-Saidy D., Ottobre J.S., 1996. spawning. Reproductive physiology of yellow perch (Perca The hydrotechnic works often generate aquatic ecosystem disturbances. Sometimes they are local and short-term, but flavescens): environmental and endocrinological sometimes they cause significant long-term impact that may be irreversible. The present paper aims to analyze the possible impact of the maintenance works performed on Bastroe channel fairway on the populations’ dynamics of CONCLUSIONS cues. Journal of Applied Ichthyology 12: 139-148. Gillet C., Dubois J.P. Bonnet S., 1995. Influence of migratory anadromous fishes, sturgeon. temperature and size of females on the timing of The methodology implied sturgeon tagging and migration monitoring using ultrasonic telemetry technique during 1. Controlled reproduction is the most reliable spawning perch, Perca fluviatilis, in Lake Geneva 2011-2014. The tags were inserted into the abdominal cavity through a simple surgical intervention, being set to method for obtaining a high number of perch from 1984 to 1993. Environmental Biology of Fishes transmit data related on swimming depth and water temperature towards receiver stations fixed on Chilia branch, larvae. 42: 355-363. upstream and downstream of Bastroe channel, Tulcea and Old Danube branches. 2. Perch spawners of wild and cultured stocks Horvath L., Szabo T., Burke J., 1997. Hatchery testing of The results showed that the distribution of the adult specimens during migration on Chilia and Tulcea branches was GnRH analogue - containing pellets on ovulation in 53% - 47% (spring 2012/2014) and 31% - 69% in autumn 2013. A possible progressive warping of the Old Stambul spawn easily in captivity. four cyprinid species. Polskie Archiwum and especially Musura branch, as well as an increase of the naval traffic on Bastroe channel will have major negative 3. The main factors that influence the amount Hydrobiologii 44: 221-226. effects on upstream sturgeon migration for breeding. and quality of perch artificial spawning are: Kouril J., Linhart 0., Reiot P., 1997. Induced spawning gametes; temperature, photoperiod and of perch by means of a GnRH analogue. Aquacult. Key words: fish migration, monitoring, Old Danube, sturgeon conservation. physiological status of the parents. Int. 5: 375-377. Kucharczyk D., Kujawa R., Mamcarz A., 1996a. A new INTRODUCTION by digging the channel, which will cause the 4. The use of different types of hormonal experimental incubation chambers for perch (Perca water flow’s system change and a new way of treatments can lead to getting quality material fluviatilis) eggs. Progressive Fish - Culturist 58: 281- Chilia branch and Bastroe channel are parts of sedimentation in the area of the Bastroe gametes and species for aquaculture 283. the Danube Delta Biosphere Reserve, having estuary. The impact on ichtyofauna may be a development. Kucharczyk D., Kujawa R., Mamcarz A., Skrzypczak A., great importance due to the many types of temporary one, generated by high mortality 5. Reproduction of agents used in our Wyszomirska E., 1996b. Induced spawning in perch, Perca fluviatilis L. using carp pituitary extract and aquatic and terrestrial habitats existing here. among fish species caused by dredging experiments the best results were obtained hCG. Aquaculture Research 27: 847-852. The universal value of the reserve has been activities or their withdrawal from the area, and when hCG and Ovopel. Ronyai A., 2007. Induced out-off-season and seasonal recognized by its inclusion in the international also a permanent impact, irreparably through 6. The doses of spawning agents depend on tank spawning and stripping of pike perch (Sander network of the Biosphere Reserves (1990), the disappearance of species due to changes of many factors: time of spawning (season, out-of- lucioperca L.). Aquacult. Res. 1-8. within the Program "Man and Biosphere" habitual requirements. season) maturation stage of fish gonads and (MAB) launched by UNESCO in 1970. Bastroe One category of fish species sensitive to hydro- type of hormone. channel was formed naturally and makes the morphological changes of the watercourse is connection between Chilia branch and the represented by sturgeon. It is proved the fact Black Sea. Although the area benefits of full that human activities related to the change of ecological protection regime, according to the natural watercourses led to a decline of this which any human activity in the region is species population over time. The best example forbidden, in the area have been conducted a are the dams built for the Iron Gates I and II series of works for the riverbed arrangement Hydropower plants (Bacalbasa-Dobrovici, through which is seeking the direct access of 1993, 1997; Ciolac, 2004; Reinartz, 2002). The commercial ships in the Black Sea (Șofineți interruption of the longitudinal connectivity of and Dobrotă, 2004). An effect of the channel watercourses leads to the impossibility of arrangement will be an overall disturbance of reproduction in case these species cannot reach the habitats, due to the banks transformations to specific habitats located upstream and thus, 337 the number of specimens decreases alarmingly measurements (single beam and multibeam), In order to have a general overview of the specimen did not reproduced in the previous from one year to another (Kerr et al., 2010; Yi sections from one side of the riverbed to the sturgeon migration on Chilia branch and to year and intended to acccomplish this action in et al., 2010). other were made, on a sector of approximately perform a comparison with their behavior on 2014. Sturgeon are cartilaginous bony fish species 600 m (300 m downstream the location where Tulcea branch, the research team mounted that migrate from the Black Sea on the Danube the monitoring system was mounted and 300 m reception systems for ultrasonic signal on River only for reproduction, and then return upstream). The measurements result was a 3D Danube River at km 100, on Tulcea branch at into the sea (Oţel, 2007; Antipa, 1909; representation of the river morphology. For the km 70 and on Chilia at Bastroe confluence Bănărescu, 1964 ). National legislation protects assembly, it has been chosen only the areas (Fig. 1). sturgeon species by prohibiting fishing and with slight slope, without deep thresholds or their commercialization (Order no. 330/2006) holes, which may screen the signal transmitted and by Danube programs for restocking with by the ultrasonic mark attached to sturgeon juvenile sturgeon specimens. Internationally, specimens. many non-governmental organizations take The ultrasonic tagging of sturgeon specimens action for saving sturgeon species. has been conducted after a procedure with Sturgeons are important due to the fact that minimal stress on specimens. Thus, fish have their presence on the Danube River was been placed in a contention floating tube, confirmed since ancient times and represented directly into the water body provided with slots a source of food for coastal communities. for a good oxygenation (Badilita et al., 2012). Greek orator, Claudius Elian in his papers from Before the tagging surgery, biometric measu- the second century b.h. describes a technique rements have been performed (total length, for beluga capturing in the Danube River standard length, weight), the genre of the fish Figure 1. Location of the monitoring stations through the use of lines with hooks attached to has been determined
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