Domestication of Pseudopimelodus mangurus

[bekateen]

Shiguemoto, G. F., Arashiro, D. R., Levy-Pereira, N., Santos, S. C. A., Senhorini, J. A., Monzani, P. S., & Yasui, G. S. (2020). Domestication strategies for the endangered catfish species Pseudopimelodus mangurus Valenciennes, 1835 (Siluriformes: Pseudopimelodidae). Brazilian Journal of Biology, (AHEAD). https://doi.org/10.1590/1519-6984.224913

https://www.scielo.br/scielo.php?pid=S1 ... ci_arttext

ABSTRACT
Wild fish domestication can be considered a strategic approach to endangered species conservation, supporting studies and reducing economic and environmental costs. Three of the most important strategies in the domestication processes of fish are the adaptation of wild fish to captivity, the reproduction of the adapted fish and the production and maintenance of the young individuals. That being said, the present study is divided in three experiments: the 1st aimed to adapt wild

Pseudopimelodus mangurus

to captivity environment using different feeding approaches and a prophylactic strategie; the 2nd aimed at reproduce the adapted individuals from the 1st experiment; and the 3rd aimed to train the juvenile P. mangurus to accept commercial diets. The 1st and 2nd experiments were successful at the maintenance and artificial reproduction of P. mangurus kept in tanks between the reproductive seasons. The results suggest that the reproductive performance of animals kept in captivity (initial relative fertility-IRF = 609.25 ± 36.6 eggs / g) was similar ( p > 0.05) to the performance found in wild individuals (IRF = 679.21 ± 45.66 eggs / g). Feed training of juvenile P. mangurus (3 rdexperiment) was also conducted, evaluating three feeding treatments with different concentrations of bovine heart and ration. At the end of the experiment, the treatment containing half bovine heart and half commercial feeding resulted in the highest values ​​of weight gain (0.10 ± 0.16 g), specific growth rate (0.37 ± 0.11 mm), length (47.78 ± 2.35 mm) and growth (2.15 ± 2.27 mm), suggesting reasonable acceptability to artificial diets in the cultivation of this species. As conclusion, the present study contributions with the development of techniques for the domestication of fresh water fish species with commercial value or andangered of extinction, showing the domestication and reproduction of wild P. mangurusin captivity. However, more studies have to be conducted in order to improve the acceptance of artificial feeding by juveniles and to increase their survival rate.

• Keywords: aquaculture; artificial reproduction; conservation; feed training; marbled catfish; Siluriforms

[Bas Pels]

I wonder what the purpose of these bred fishes is. Are they to be reintroduced or are they to replace collection for food from the wild?

If it is the first, one would want the fish to grow approximately with the same speed as ios oberved in the wild Certainly not twice or three times as fast. The think is, fish raised far too quickly will never get old.

If it is the latter, rapid growth will only have advantages.

What I want to stress is, depending on the purposes of the raised fish, one would aim at other results.

In the study three feeding regimes were compared: beedheard, tetra and half-half. That is, no cold blooded food was considered, and I did not find any information about normal growth.

Which is a pity.