Blue Velvet Shrimp Grading Guide: Colour Intensity and Selection

Blue velvet shrimp are among the most popular Neocaridina davidi colour morphs in the planted tank hobby, but not all blues are created equal. Colour intensity varies dramatically between specimens, and understanding grading helps you select the best stock and breed towards deeper, more consistent hues. This blue velvet shrimp grading guide from Gensou Aquascaping at 5 Everton Park, Singapore, explains what to look for and how to improve your colony’s colour over generations.

Understanding the Blue Velvet Colour Line

Blue velvet shrimp belong to the Neocaridina family, the same species as cherry shrimp and yellow shrimp but selectively bred for blue pigmentation. The blue colour comes from a combination of pigment cells in the exoskeleton. Unlike Caridina species such as blue bolts, Neocaridina blues are hardier and tolerate a wider range of water parameters, making them ideal for Singapore’s tap water conditions.

Grading Scale for Blue Velvets

Grading follows a general hierarchy based on opacity and coverage. Low-grade specimens appear translucent with patches of pale blue, often with a visible clear stripe along the back. Mid-grade shrimp show solid blue across most of the body but may have lighter legs or a faintly transparent underbelly. High-grade blue velvets display deep, opaque blue from rostrum to tail, including the legs and even the swimmerets.

The highest tier, sometimes marketed as blue dream or blue diamond, achieves an almost navy intensity with zero translucency. These command premium prices of $5-8 each in Singapore, compared to $1-3 for standard blue velvets at local shops.

What Affects Colour Intensity

Genetics is the primary factor. Breeding two high-grade parents consistently produces darker offspring, though occasional throwbacks to lighter shades occur. Beyond genetics, diet plays a significant role. Foods rich in astaxanthin and spirulina deepen blue tones. Mineral-rich water with GH 6-8 supports a healthy exoskeleton that displays pigment better than soft-water shrimp with thinner shells.

Substrate colour also influences apparent intensity. Dark substrates like ADA Amazonia or black sand make blue velvets pop visually, while light-coloured gravel washes out their appearance. Lighting matters too; cooler white LEDs around 7000-8000K accentuate blue tones more than warm yellowish lights.

Selecting Breeding Stock

When purchasing shrimp for a breeding colony, prioritise females with deep, uniform colour. Females carry and pass on colour genetics more reliably in Neocaridina lines. Choose males that are also solidly coloured, though males are naturally slightly less vivid than females of the same grade. Avoid mixing blue velvets with other Neocaridina colour morphs; interbreeding produces muddy wild-type offspring within a few generations.

Breeding for Better Grades

Start with a colony of at least 15-20 shrimp to maintain genetic diversity. As offspring mature, cull or rehome individuals that fall below your target grade. Keep only the deepest-coloured juveniles for breeding. Over four to six generations, typically 8-12 months, you will see a noticeable shift toward more consistent, deeper blues.

Culled shrimp need not be discarded. Lower-grade blue velvets still look attractive in community tanks and sell readily on Carousell for $1-2 each.

Water Parameters for Blue Velvets in Singapore

Neocaridina are famously adaptable. PUB tap water dechloraminated and remineralised to GH 6-8, KH 3-5, pH 7.0-7.5 provides excellent conditions. Temperature of 24-28 °C is maintained naturally in most Singapore homes. Use a GH remineraliser like Salty Shrimp GH+ if your water is too soft. Consistent parameters matter more than hitting exact numbers.

Feeding for Colour Development

Rotate between a high-quality shrimp pellet, blanched spinach, spirulina wafers, and occasional protein like frozen bloodworm. Colour-enhancing foods containing astaxanthin, such as certain Shirakura or Glasgarten products, measurably improve blue intensity over several moults. Feed sparingly; a small pinch every other day is sufficient for a colony of 30-50 shrimp in a 30 litre tank.

Sourcing Quality Blue Velvets Locally

Singapore has an active Neocaridina breeding community. Specialist shrimp sellers on Carousell and Shopee often offer graded specimens with photos. Physical shops along Serangoon North Avenue 1 and Thomson carry standard grades, while high-grade blue dreams are more reliably found from hobbyist breeders. Gensou Aquascaping Singapore recommends purchasing from breeders who can show you the parent colony, as this gives you the clearest picture of the genetic potential in your new stock.

Related Reading

• Blue Dream Shrimp vs Blue Velvet Shrimp: Grade and Colour Differences
• Aura Blue Shrimp Care Guide: Caridina Cantonensis Blue Morph
• How to Breed Blue Bolt Shrimp: Taiwan Bee Colour Selection
• Blue Bolt Shrimp Care Guide: The Crown Jewel of Caridina
• How to Breed Blue Dream Shrimp: Neocaridina Colour Line Selection