Comparison of Growth Rate of Olive Ridley Turtle Hatchlings (Lepidochelys olivacea) Based on Various Food Types
DOI:
https://doi.org/10.61741/JMBI.2026.v4.p91-97Kata Kunci:
Lepidochelys olivacea; hatchling rearing; growth rate; sea turtle conservationAbstrak
The success of sea turtle hatchling (“tukik”) release into the wild depends heavily on pre-releases rearing quality, particularly feeding management. This study evaluated the effects of four feed types on the growth performance of Olive Ridley turtle hatchlings (Lepidochelys olivacea) during captive rearing. A Completely Randomized Design (CRD) was applied with four treatments i.e. vannamei shrimp (control), acetes shrimp, mackerel tuna, and commercial fish pellets, each with five replicates over 35 days. Observed parameters included i.e. weight gain, carapace length and width, specific growth rate (SGR), feed conversion ratio (FCR), feed utilization efficiency (FUE), and survival rate (SR). Feeding with mackerel tuna produces the highest weight gain 16.54 g, carapace length increases 11.41 mm, width increase 13.40 mm, and the highest SGR was 1.95%/day. ANOVA revealed that feed type had no significant effect on weight gain (F=2.59, p=0.086), but significantly affected carapace length (F=6.57, p=0.003) and width (F=6.21, p=0.005). Post-hoc LSD tests confirmed that mackerel tuna significantly outperformed all other treatments in carapace dimensions. Despite having lower crude protein content (23.33%) than pellets (45%), mackerel tuna yielded superior growth outcomes, likely due to higher palatability, digestibility, and lipid content (8.6%) favouring tissue development. Pellets showed comparable weight gain (15.23 g) and SGR (1.84%/day), yet the lowest survival rate (80%) due to one mortality. All natural-feed treatments achieved 100% SR. Mackerel tuna is recommended as the optimal feed for L. olivacea hatchlings during pre-release rearing.
Highlights
This article examines the conservation measures implemented for the olive ridley turtle, which have been supported by the IUCN and governed by Indonesian regulations since 1999. The research specifically investigates the growth performance of turtle hatchlings, with findings that include.:
- four treatments i.e. vannamei shrimp, acetes shrimp, mackerel tuna, and commercial fish pellets, each with five replicates over 35 days
- Feeding with mackerel tuna produces the highest growth either weight gain and carapace length/width.
- Natural feed gives a better survival rate (100%) of the turtle instead of pelleted feed (80%).
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