Diet and water temperature affect growth and body deformities in juvenile tenchTinca tinca(L.) reared under controlled conditions

Abstract

The experiment was designed to determine the combined effect of fish diet and water temperature on juvenile tench Tinca tinca (L.). Three diets were used: commercial dry diet for fish Aller Futura (diet F); frozen Chironomidae larvae (diet C); and Aller Futura substituted with Chironomidae at a ratio of 3:2 (dry weight; diet FC). Daily food rations and duration of the experiment were adjusted to temperatures of 20°C, 23°C and 26°C based on a correction factor q equal to 1.000, 0.779 and 0.609 respectively. The experiment lasted 92, 72 and 56 days for the respective temperatures. No mortality occurred. The highest relative growth rates were found at 26°C in diets F and FC. The lowest food conversion ratio of 1.12-1.22 (recalculated for dry weight of feed diet) was determined in fish fed diet F at 23°C and 26°C. A high value of condition index appeared to be the early warning of decreasing biological quality of fish and deformities. The lowest incidence of fish with deformities (IDef) was found in groups fed diet C (<1%), while the highest (90%) in fish fed diet F at 26°C. A lower share of dry diet in the fish food and a lower water temperature led to a lower IDef. Thus, amount of dry feed in fish diet was the major factor inducing body deformities, while water temperature only modified the effects of the dietary factor. Diet C at 23-26°C was the most cost-effective of the tested combinations of diet and temperature.

The effect of feeding commercial diets on the development of juvenile crucian carp (Carassius carassius, L.). Part 1: Skeletal deformations

“…Meanwhile, the diversity of CF could be attributed to the enormous body shape plasticity of this species (Kapusta et al., ; Stabell et al., ). However, shorter body length and higher mortality in the Y group were most certainly associated with the appearance of skeletal deformations, because these basic observations comply with several studies conducted on other cyprinid species (Kamiński, Sikorska, & Wolnicki, ; Kamler, Wolnicki, Kamiński, & Sikorska, ; Wolnicki & Górny, ).…”

Skeletal Development and Deformities in Tench (Tinca tinca): From Basic knowledge to Regular Monitoring Procedure

“…Previous studies have already speculated whether skeletal deformities are an important bottleneck in tench aquaculture, but none of them explored this topic with specific techniques such as acid-free double-staining and/or X-rays, just being based on basic observations of the general external morphology [13,[21][22][23][24][25][26]. The development of early bony ossification in fish species through an acid-free double-staining technique, reduces inaccuracies of descriptions on skeletal development due to the decalcification of small structures undergoing ossification when using an acid staining protocol [16].…”

Extracorporeal acidic predigestion of commercial dry diets can reduce the incidence of body deformities in the stomachless fish crucian carp (Carassius carassius L.)

“…In numerous feeding trials lasting 60 days or longer, high shares of body deformities were detected in cyprinid fish species prone to deformities that were fed intensively with commercial diets under controlled conditions (Myszkowski et al 2002, Wolnicki 2005, Kamler et al 2006, González-Rodríguez et al 2014, Kamiñski et al 2017. Likewise, in the current 60-day experiment, very high shares of fish with visible deformities were found in both groups fed the original dry diets (74.0 and 87.0%).…”