Feeding Activity and Growth Performance of Shrimp Post Larvae Litopenaeus vannamei Under Light and Dark Condition

Abstract

The present study was conducted to elucidate the effects of light and dark condition on the feeding activity of shrimp, Litopenaeus vannamei. Examination on the ingestion rate of shrimps at different sizes (0.5, 1.0 and 1.5 cm total length, TL) under light and dark condition was conducted using newly hatched frozen Artemia nauplii. For each condition, shrimp were let to ingest known number of Artemia nauplii for 30 minutes, thereafter the remaining Artemia nauplii was counted. For the observation of eye structures under light and dark conditions, 1.0 cm TL shrimps were preserved in Bouin's solution for histological observation. Another feeding trial was conducted to examine the growth performance and survival of shrimps (initial size 1.0± cm, TL) under different photoperiod regimes (24 hours dark: 24D, 24 hours light: 24L and 12 hours light and dark: 12LD) for three weeks. Results showed that, the 0.5cm TL shrimp significantly ingested more Artemia nauplii under light condition compared to dark condition (P = 0.000). The 1.0 and 1.5 cm TL shrimps consumed Artemia naulplii equally under both conditions. The shrimp attained a complete eye structure which can be differentiated into crystalline cone, clear zone, rhabdom and fasciculated zone at 1.0cm TL. This study also showed that growth (P = 0.557) and survival (P = 0.686) of shrimps did not vary significantly among different photoperiod. This study suggests that the feeding activity of the smallest shrimp (0.5 cm TL) is affected by light condition. However, feeding activity, growth and survival of bigger sized shrimp (> 1.0 cm TL) were not affected by light and photoperiod regimes.

Reproductive Cycle and Fecundity in Natural Population of Edible Freshwater Crab, Oziothelphusa senex senex (Fabricius, 1798) (Decapoda: Brachyura)

“…Similar photoperiod associated gonad maturation was observed in Cambarus virilis [35], Procambarus simulans [36] and in Procambarus clarkii [37,38]. In Litopenaeus vannamei feeding activity, growth and survival of smaller animals were affected by photoperoid [39]. Further, studies of Tidwell et al [40] indicated that continual light conditions have positive impact on survival of Macrobrachium rosenbergii juveniles during the nursery phase.…”

The importance of behaviour in improving the production of shrimp in aquaculture

“…These findings may reflect the ontogenetic development of chemoreceptors to find food sources compared to larval stages that rely more on vision (Sanudin et al . ). However, more research into ontological changes in chemoreception vs vision is necessary and presents an exciting area for future studies.…”

“…Sanudin et al . () examined L. vannamei larvae (0.5 cm total length (TL)) and demonstrated a greater ingestion rate of feed in light conditions compared to dark. As the shrimp grew (up to 1–1.5 cm TL), differences between light and dark conditions did not influence the feeding activity to the same degree.…”

A exposição ao fotoperíodo melhora as características biométricas de pós-larvas de Litopenaeus vannamei?

“…Para juvenis de Farfantepenaeus paulensis Wasielesky et al (2012) observaram que a maior luminosidade também favoreceu o desenvolvimento da espécie em relação ao ambiente sombreado. Em sistemas de cultivo com bioflocos a sobrevida de L.vannamei também esteve associada ao incremento do número de horas de fotoperíodo (Baloi et al, 2013;Viet et al, 2017;Reis et al, 2019) e mesmo ao porte dos indivíduos (Sanudin et al, 2014). Neste caso, pode ser que a influencia da luminosidade nos camarões seja variável com as condições de contorno (i.e.…”