Early ontogeny of Tropheus moorii Boulenger 1898 [Pisces, Cichlidae, Lake Tanganyika] in laboratory conditions

• Autorzy: Prusinska M , Mamcarz A. , Kupren K.

Warianty tytułu

PL

Wczesny rozwoj gebacza z gatunku Tropheus moorii Boulenger 1898 [Pisces, Cichlidae, Jezioro Tanganika] w warunkach laboratoryjnych

• Języki publikacji: EN

Abstrakty

EN

In this work were shown some crucial moments in early Troheus moorii development (for example: begin of exogenous feeding period, end of endogenous feeding period, time of finish fins development and others). Fertilized eggs, obtained after natural spawn from females of Tropheus species kept in tank, were incubated in laboratory conditions. Hatched embryos were reared in incubation tank, in constance temperature, until resorption of the yolk sac and finish fins development. Embryos were fed ad libitum with live Artemia nauplii. In Tropheus, the fins became fully developed and the yolk sac supplies depleted on the same day, 25th since the mating. Since this species keeps its offspring in the mouth for 30–35 days (YANAGISAWA, SATO 1990), the young stay in they shelter for another one to two weeks. When they are let out for the first time, they are in an advanced stage of their development, mature enough to live like the adults of their species. Since their yolk sack supplies are depleted before the termination of parental care period, it is obvious that they must be intrabucally fed in this time. It is confirmed by the fact that in aquarium conditions incubating females pick the food particles as the non-incubating females do. The food had been found on a regular basis in incubating females mouths when acquiring eggs and embryos for observations. Since the young Tropheus already can ingest exogenous food while being still in mothers mouth, it is on purpose to feed crushed food to the incubating females in aquarium conditions.

PL

W pracy opisano niektóre kluczowe momenty we wczesnym rozwoju Tropheus moorii (np. rozpoczęcie odżywiania egzogennego, zakończenie odżywiania endogennego, zakończenie rozwoju płetw i inne). Zapłodnione jaja tego gatunku, otrzymane w wyniku naturalnego tarła od tarlaków przetrzymywanych w akwariach, inkubowano w warunkach laboratoryjnych. Po wykluciu zarodki umieszczano w specjalnym akwarium, w stałych warunkach środowiskowych, aż do pełnej resorpcji woreczków żółtkowych oraz zakończenia rozwoju płetw. Karmiono je ad libitum żywymi stadiami nauplialnymi solowca. Zaobserwowano równoczesne zakończenie rozwoju płetw i wyczerpanie woreczka żółtkowego w 25. dniu od tarła. W związku z faktem, iż młode Tropheus przebywają w jamie gębowej samicy przez 30–35 dni (YANAGISAWA, SATO 1990), znajdują one tam schronienie jeszcze przez tydzień lub nawet dwa od momentu wkroczenia w stadium juwenilne. Kiedy samica wypuszcza je po raz pierwszy są rozwinięte na tyle, że mogą pędzić życie podobne do osobników dorosłych. Można więc stwierdzić, że młode tego gatunku muszą pobierać pokarm egzogenny, jeszcze w czasie gdy przebywają w jamie gębowej matki. Potwierdzeniem tej tezy jest także fakt, że wielokrotnie obserwowano inkubujące samice, które aktywnie poszukiwały pokarmu i pobierały go, zupełnie tak samo, jak czynią to samice nieinkubujące. Podczas pobierania młodych znajdowano również pokarm we wnętrzu jam gębowych samic. Skoro młode trofeusy mogą połykać pokarm, znajdując się jeszcze w jamie gębowej samicy, to podawanie go samicom inkubującym może wpłynąć na lepsze wyniki w hodowli tego gatunku.

• Wydawca: -
• Czasopismo: Polish Journal of Natural Sciences
• Rocznik: 2008
• Tom: 23
• Numer: 4
• Strony: 888-903
• Opis fizyczny: p.888-903,fig.,ref.

Twórcy

autor

Prusinska M

• University of Warmia and Mazury in Olsztyn, Michala Oczapowskiego 5, 10-719 Olsztyn, Poland

autor

Mamcarz A.

autor

Kupren K.

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