Comportamento alimentar e resistência à inanição de larvas de camarões ornamentais do género Lysmata (Decapoda: Hippolytidae)

Dionísio, G.

http://hdl.handle.net/10400.1/351

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Authors

Dionísio, G.

Advisor(s)

Dinis, Maria Teresa

Calado, Ricardo

Abstract(s)

The present study describes the effect of starvation on the survival of early zoeal stages of Lysmata amboinensis, L. debelius, L. boggessi, L. seticaudata. Studied species occupy different habitats and exhibit different levels of tolerance to the absence of food. Only newly hatched larvae of L. seticaudata and L. boggessi display facultative primary lecithotrophy, moulting from zoea I to zoea II when starved. All studied species show secondary facultative lecithotrophy on the second zoeal stage, being able to moult to zoea III in the absence of food. Nevertheless, this ability was only recorded in larvae at the second zoeal stage which have not been previously exposed to starvation in zoea I. This is the firts record of secondary facultative lecithotrophy among caridena shrimps. Newly hatched larvae of L. amboinensis, L. debelius, L. ankeri e L. seticaudata show a higher tolerance to starvation periods when kept in the dark, compared to photoperiods with 12 or 24 h of light. This fact may be due to a lower larval energetic consumption as a consequence of a decreased swimming activity. Light exposure is not a determinant factor for prey capture in Lysmata larvae, reinforcing the assumption of decapod crustacean larvae not being active predators. Newly hatched larvae of different studied species ingest similar amounts of Artemia nauplii, while L. ankeri and L. seticaudata are able to capture a higher number of enriched Artemia metanuplii. The comparison of morphological and biometrical larval features do not show a particular pattern, being insufficient to explain the differences recorded in the number of ingested preys. The ability displayed by these organisms to capture and ingest large sized preys (e.g. Artemia metanauplii) opens good perspectives for the use of inert diets during early zoeal stages.