Shrimp & Prawns

Bigclaw river shrimp

Macrobrachium carcinus

Macrobrachium carcinus

SaltwaterFreshwaterBrackish

At a glance

Typical size

Most shrimp/prawns in this guide are measured in inches, commonly about 3–8 in depending on species.

Depth

Bottom-dwelling shellfish occur on sand, mud, seagrass, reef or hard substrate depending on species.

Best time

Use daylight/visibility and safe tide conditions unless local rules and experience support another approach.

Found in

9 Caribbean areas

Spot it, size it up and learn its habits.

Identification: Bigclaw river shrimp (Macrobrachium carcinus) — field identification starting point: a segmented crustacean with a rostrum, long antennae, walking legs and a muscular abdomen. Confirm the exact species against the approved photo and scientific-name biology reference.
Typical size: Most shrimp/prawns in this guide are measured in inches, commonly about 3–8 in depending on species.
Maximum size: Large prawns/shrimp can approach or exceed 10 in depending on species.
Diet: Many bivalves filter plankton; grazing snails eat algae/biofilm, while some mollusks are predators/scavengers.
Behavior: Usually attached, buried or slow-moving on the bottom; distribution follows substrate, salinity and water quality.

Where, when and how deep to look.

Where to find it: Found in Puerto Rico. Start in the documented habitat and substrate for this species, then narrow the search using depth, current, structure and food activity. Habitat reference: sand, mud, seagrass, mangrove/estuary and shelf bottom depending on species
Habitat: Habitat: not recorded yet.
Depth: Bottom-dwelling shellfish occur on sand, mud, seagrass, reef or hard substrate depending on species.
Fishing depth: Search only legal collection areas and depths where the bottom can be inspected safely; closures and sanitary status matter more than a fishing depth number.
Fishing environments: Water: marine, freshwater and brackish.
Best season: Collect only during open legal/sanitary periods.
Best time: Use daylight/visibility and safe tide conditions unless local rules and experience support another approach.
Best tides: Low water or low current can improve access/visibility, but never enter exposed reef, surf or mudflat conditions unsafely.
Best weather / conditions: Choose sea state, wind and visibility that let you hold position and handle the fish safely. Avoid treating rough weather as a feeding advantage.

What to tie on and what to throw.

Best bait: Bait is method-dependent; small bait pieces may be used in traps where legal, while nets generally rely on locating shrimp concentrations.
Best artificial lures: Not applicable.
Tackle setup: Legal net/trap gear, light, gloves, measuring/sorting tools if required and plenty of ice.
Hook size: Not normally a hook-and-line target.
Line: Not applicable.
Leader: Not applicable.

What BigJoe would use to catch shrimp.

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Step by step, from first cast to landing.

Start where the species is most likely to occur: sand, mud, seagrass, mangrove/estuary and shelf bottom depending on species
Rig for the habitat and current: Use only lawful dip/cast/trap gear for the exact water and species.
Choose an offering that matches the fish and situation. Natural bait: Bait is method-dependent; small bait pieces may be used in traps where legal, while nets generally rely on locating shrimp concentrations. Lures/alternatives: Not applicable.
Fish it with this starting approach: Locate shrimp in legal habitat, use the permitted net/trap method, and sort/ice the catch quickly. Presentation: Collection rather than presentation: avoid breaking habitat and return undersized/prohibited animals immediately.
Use timing and water movement as adjustments, not guarantees. Time: Use daylight/visibility and safe tide conditions unless local rules and experience support another approach. Tide/current: Low water or low current can improve access/visibility, but never enter exposed reef, surf or mudflat conditions unsafely.

Fishing techniques: Locate shrimp in legal habitat, use the permitted net/trap method, and sort/ice the catch quickly.
Catch and release: Let it go quickly if you're not keeping it.

Is it good to eat, and how to prepare it.

Edibility: BigJoe does not classify Bigclaw river shrimp as a routine food species from the current source set. That is not a claim that it is poisonous; before eating, confirm exact identification, lawful retention, documented local food use and current public-health advisories.
Table quality: Not a common food fish — most anglers release it.
Cleaning: Keep the catch cold and clean. Rinse with clean water, remove the head/shell if desired, devein when appropriate, and return cleaned shrimp to ice or refrigeration immediately.
Cooking suggestions: Cook shrimp until the flesh becomes firm, pearly and opaque. Do not rely on color alone if the product is unusually large or prepared in a sauce; keep raw and cooked seafood separate.

Safety, rules and taking care of the fishery.

Safety warnings: Spines/shells can puncture skin; chill the catch quickly and avoid cross-contamination.
Regulations: No species-specific size, bag or season limits are listed here.
Conservation: Avoid needless kills and follow protected-species, area and season rules.

Tap an island for local spots and rules.

Sources & photo credits

Other names: No synonyms recorded.

Tips marked as common know-how come from everyday Caribbean fishing. They're a starting point — not a safety check, a permit or a guaranteed catch.