Marconato and Rasotto, 1989



Citation


Marconato, A. and Rasotto, M.B. (1989) The biology of a population, of spined loach, Cobitis taenia L. Boll. Zool., pp. 73-80

Associated characteristics


Species Development state Trait Primary Data Secondary Data
Cobitis taenia Spawning conditions Mating system Despite the occurrence of some hermphrodite specimens, data do not support functional protandrous hermaphroditism among males. The study of gonadogenesis and gonads showed that in the population under study only accidental and non functional hermaphroditism occurs No category
Cobitis taenia Spawning conditions Spawning period duration The breeding season if from May to July [Larger females matured and spawned earlier than smaller ones] No data
Cobitis taenia Female Female sexual dimorphism The sexual dimorphism in size between males and females was evident Absent
Cobitis taenia Female Maximum GSI value Mean of 0.28, range 0.24-0.30 [Mid June but for GSR, which is the gonad weight/total weight minus gonad weight] 0.27 percent
Cobitis taenia Male Onset of spermatogenesis Autumn No data
Cobitis taenia Male Maximum GSI value About 5 but for GSR which is the gonad weight/total weight minus gonad weight 5.0 percent
Cobitis taenia Female Age at sexual maturity Most males and females become sexually mature in their second spring after hatching No data
Cobitis taenia Female Resting period Decrease between August and November No data
Cobitis taenia Male Main spermatogenesis activity April-May ['April', 'May']
Cobitis taenia Female Onset of oogenesis Based on graph, could be in November-December ['November', 'December']
Cobitis taenia Female Intensifying oogenesis activity Based on GSI graph, GSI varied from 12% in beginning of April to 22% in the end of April to 26% in the end of May ['April', 'May']
Cobitis taenia Female Oocyte development In mature females, the ovary is asynchronous, with oocytes in different stages of vitellogenesis Asynchronous
Cobitis taenia Male Resting period September No data
Cobitis taenia Egg Oocyte diameter Large ripe yellowish eggs 1.3-1.6 mm 1.45 mm
Cobitis taenia Male Spermatogenesis duration Spermatogenesis occurs in males not onyl from May to July, but also in autumn. During winter, the testes were still filled with spermatozoa, with spermatogonia located in the wall of the lobules. Therefore the winter phase of quiscence is not folled by the depletion of the testes which remain full of sperm throughout the year No data
Cobitis taenia Female Absolute fecundity Estimation of fecundity gives a value of 1012 eggs for a 90 mm female, lower than 1600 eggs per females already reported 1012.0 thousand eggs
Cobitis taenia Spawning conditions Spawning season The peak of spawning occured in early June when several running females were caught ['June']
Cobitis taenia Female Age at sexual maturity Most males and females become sexually mature in their second spring after hatching No data
Barbatula barbatula Spawning conditions Spawning release Multiple spawning have been suggested Mutliple
Cobitis taenia Spawning conditions Spawning release If this species is a fractional spawner the actual number of eggs produced by each female may be greater Fractional
Cobitis paludica Spawning conditions Spawning release Multiple spawning have been suggested also for C. paludicola Mutliple