Live Mysis Fish Food - 25 x 90ml PE Bags

Live Mysis Fish Food - 25 x 90ml PE Bags is a bulk live-feed format for fishrooms, breeders and aquarists who can use multiple small bags promptly. The product is sold as live mysid feed, not frozen mysis. Each pack contains 25 separate PE bags in the supplier's 90ml bag format. The 90ml figure describes the nominal bag format; it is not a promise of 90ml pure animal biomass, a fixed shrimp count or a stated net weight.

Mysis and mysid are common trade words for small shrimp-like crustaceans in the order Mysida. The source record does not identify the species, culture origin, salinity, life stage, count per bag or guaranteed nutritional analysis. This page therefore does not label the contents as Mysis relicta, a marine species, a freshwater species or a PE Mysis branded frozen product. It also does not promise suitability for every fish, seahorse, mandarin, coral, amphibian or axolotl.

What does 25 x 90ml PE bags mean?

The pack is a wholesale-style case of 25 individually sealed small bags. This can be practical when feeding several aquariums, conditioning breeding groups or sharing a delivery between experienced keepers. It may be excessive for one lightly stocked home tank. Before ordering a future restock, calculate how many bags can be used while the organisms remain in acceptable condition under the instructions supplied with that batch.

A 90ml-format bag contains transport or holding water as well as live feed. It should not be compared directly with a 90g frozen cube, 90ml of drained shrimp or a labelled net weight. The supplier record does not state a minimum count or drained biomass. Natural size and density can also vary between bags. The honest purchase unit is therefore 25 live-food bags, not a guaranteed number of mysids.

Pack wording	What it means	What it does not mean
25 pack	Twenty-five separate PE bags	Twenty-five individual mysids
90ml	Supplier bag format including holding water	90ml pure biomass or a 90g net weight
Live Mysis	Live mysid-type crustacean feed	A frozen slab, blister or named species guarantee
Fish food	Feed intended for suitable aquatic animals	A stocking animal for release or an automatic complete diet

Live mysis and frozen mysis are different products

The old metadata called this frozen food while the title, category and package format called it live. That contradiction is removed. The 25 x 90ml PE-bag product is the live listing. Petra's genuine frozen mysis formats are separately described as a 500g flat plate in a zipper bag and a 6 x 100g blister pack.

Live and frozen feeds can both be useful, but they solve different practical problems. Live prey movement can trigger feeding in some visually hunting fish. Frozen mysis is easier to store for longer periods and portion gradually. Frozen food does not need to remain alive in transit; live feed does. A customer searching for frozen mysis should use the clearly labelled Mysis Frozen Flat Plate 500g or Mysis Frozen Blister 6 x 100g, not this product.

Feature	Live 25 x 90ml bags	Frozen mysis formats
State	Live aquatic feed	Frozen feed
Storage	Perishable; follow batch instructions	Keep frozen under the product label
Feeding response	Movement may encourage pursuit	Scent and familiarity may encourage feeding
Pack use	Best where many bags can be used promptly	Better for gradual portioning over time
Species claim	Not supplied for this residual listing	Read each frozen product's own label

What are mysids?

Mysids are small shrimp-like crustaceans in the order Mysida. They occur in marine, brackish and freshwater environments, depending on species. Calling every product 'Mysis shrimp' is convenient trade language, but it does not identify a species or its water requirements. The source information for this pack says only live Mysis in PE bags.

That distinction matters. Advice for a cold-water freshwater mysid cannot automatically be applied to an unidentified live-feed bag, and advice for a marine culture cannot be assumed either. Do not attempt to establish a display colony, breed the feed or adjust the aquarium to a guessed salinity. The product is offered as feed, and the label or instructions included with a future batch should take priority over generic internet care sheets.

The name also should not be confused with the PE Mysis brand often seen in frozen-food searches. Here, PE describes the polyethylene bag format in the historical source wording. No brand claim is made.

What can nutrition research tell us?

Peer-reviewed aquaculture literature supports mysids as potentially valuable live prey. Reviews report useful protein, lipid and fatty-acid profiles in studied mysid species, and describe their movement as a feeding stimulus for fish and other aquatic predators. Mysids have been investigated as alternative live feed for marine fish nursery culture, seahorses, cephalopods and crustaceans.

Those findings do not create a laboratory analysis for this retail pack. Nutrient composition changes with mysid species, size, culture diet, environment and handling. Some studies found higher lipid or particular fatty-acid values in tested mysids than in a specific enriched Artemia treatment, but that is not a universal guarantee for every bag.

Use live mysids as one part of a species-appropriate diet. A complete prepared staple can provide consistency, while carefully chosen live, frozen and fresh foods add behavioural and nutritional variety. Breeding or larval programmes may use live feeds more intensively, but those programmes need feeding rates and enrichment matched to the exact animal.

Evidence supports	Evidence does not prove for this pack
Mysids can be valuable prey for suitable aquatic predators	A guaranteed protein or fat percentage
Live movement can stimulate capture behaviour	That every fish will recognise or digest the food
Studied mysids can contain useful fatty acids	That this product is always richer than brine shrimp
Mysids have aquaculture and aquarium-feed uses	That they form a complete diet for every target species

Which fish may accept live mysids?

Suitability begins with mouth size, feeding behaviour, life stage and normal diet. Small to medium predatory or omnivorous fish that take moving crustacean prey may show interest. Bettas, killifish, dwarf cichlids, some community fish and marine fish are often fed mysis products, but that does not mean this unidentified live format is correct for every individual.

Do not use a species list as a guarantee. A fish may ignore prey that is too large, too fast or presented in the wrong part of the water column. Herbivores need a diet built around their actual nutritional ecology. Very small fry may require rotifers, copepod stages or Artemia nauplii rather than adult-sized mysids. Large predators may find a 90ml bag uneconomical.

Seahorses and mandarins can have specialist feeding needs, while corals vary widely in prey capture and particle size. Consult a reliable care plan for the exact animal before using any live feed.

Question	Check before feeding
Can the animal swallow it?	Compare actual prey size with mouth gape and life stage
Does it hunt moving crustaceans?	Review the species' normal feeding ecology
Will it receive a balanced diet?	Keep a suitable staple and rotate foods where appropriate
Is the feed condition acceptable?	Inspect movement, odour, water and packaging on arrival
Is the source water compatible?	Avoid adding transport water and follow batch instructions

How to offer live mysis

Inspect the bag before opening. Use only a product that meets the supplier's live-feed arrival standard and the instructions provided with the order. If the bag is leaking, badly fouled, unusually odorous or the contents appear dead, do not pour it into the aquarium. Photograph the sealed bag and contact support within the applicable evidence window.

Where the batch instructions allow, separate the live feed from packing water with an appropriately fine clean sieve and rinse with water suitable for the target aquarium. Do not use soap, household disinfectant or untreated tap water. A pipette, baster or small cup can place a modest portion where the intended fish can reach it.

Start with less than you think is needed and watch the whole feeding event. Add more only while the target animals are actively taking the prey. Remove obvious uneaten organisms or dead material. Live feed does not make overfeeding harmless; animals that die unseen can decompose and raise the biological load.

Portion planning for 25 bags

The case size is designed for high-use situations. A breeder with multiple tanks may distribute one bag across several groups. A single betta keeper may struggle to use 25 bags responsibly. Because the historical listing has no verified storage-life figure, this page cannot promise that a case will remain viable for a particular number of days.

Plan consumption before purchase. Count the aquariums, estimate a cautious portion from prior live-food use and leave room for fish that refuse the first trial. Do not open bags early merely to combine them into an untested container. Separate bags reduce cross-contamination and make it easier to inspect each unit.

Use case	Fit for a 25-bag case	Reason
Breeding room with many suitable fish	Potentially good	Several bags can be used while fresh
Retail or club group order	Potentially good	Sealed bags can be allocated between experienced keepers
One lightly stocked aquarium	Usually poor	High risk of waste before all bags are used
First live-food experiment	Consider a smaller product	Prey acceptance is not yet known

Storage and handling

Live mysids are perishable aquatic animals. Follow the storage temperature, light, oxygen and use-by instructions supplied with the actual batch. Those details can change with species, packing method and season, and none is documented in the current residual record. The page therefore does not invent a refrigerator temperature or multi-day survival promise.

Keep bags protected from heat, freezing, direct sunlight, pets and household contamination. Do not freeze this live product to 'save it' unless a manufacturer instruction explicitly says the contents can be frozen safely as feed. Freezing changes a live product into an unanalysed home-frozen product and can compromise quality.

Do not add food, salt, medication or aeration to sealed retail bags. Do not attempt a culture from an unidentified organism. If longer-term live-feed culture is the goal, begin with a correctly identified culture and a purpose-built protocol.

Biosecurity and responsible disposal

Live aquatic feed can carry water and microorganisms from its production system. Buy from a responsible aquatic supplier, inspect every bag and avoid adding transport water where suitable handling instructions permit separation. Keep feed equipment separate from sick-fish tanks and wash hands between systems.

Never release unused mysids or bag water into ponds, streams, drains connected to natural water, or any outdoor habitat. The species and environmental tolerance are unknown. UK rules control the movement of live aquatic animals, and non-native release can damage ecosystems. Unused feed should be contained and disposed of according to the supplier's instructions and local requirements.

Do not sell or distribute the feed as a named culture species. The pack label is a food trade description, not a taxonomic certificate. If bags are shared within a legitimate group order, keep the original product information and handling instructions with them.

Protecting aquarium water quality

A moving prey item can disappear behind decor before it is eaten. That does not mean it is harmless. Any mysids that die in the aquarium become organic waste. Use modest portions, maintain filtration and check hidden areas after feeding. In small tanks or fry systems, the margin for error is limited.

Monitor ammonia and nitrite whenever a new feeding method is introduced, especially in newly established or heavily stocked aquariums. If readings change, stop adding the food, remove remains and correct the husbandry cause. Do not rely on snails or bottom feeders to consume excess.

Target feeding can reduce waste. Temporarily lowering strong flow may help some fish capture prey, but restore normal circulation promptly. Never leave filtration off and forgotten after a feeding session.

Comparing live mysis with other live foods

Different prey sizes and movement patterns serve different animals. Live Brine Shrimp are widely used and their identity is clearer. Live Daphnia may suit many freshwater fish and can provide a different prey profile. Live Tubifex Worms and Live White Worms are richer, worm-based alternatives for selected fish.

None is universally best. Choose by the target animal, prey size, nutrient plan, source quality and your ability to store and use the pack. Rotate only foods that genuinely suit the animal. Variety is not improved by adding unsuitable prey.

Food	Useful distinction	Check first
Live mysids	Shrimp-like moving prey; unidentified species in this pack	Prey size, condition and target-animal suitability
Live Artemia	Clearly labelled brine shrimp option	Life stage and enrichment
Live Daphnia	Freshwater water-flea prey	Size and source quality
Live Tubifex / White Worms	Worm-based conditioning options	Species diet and portion size
Frozen mysis	Longer-storage non-live alternative	Cold chain, thawing and portion control

Why this is not a mysid culture kit

Search results often ask how to breed or culture mysid shrimp. Successful culture depends on exact species, salinity, temperature, oxygen, density, cannibalism control and feed. Research protocols for one mysid cannot safely be transferred to an unidentified retail food bag.

This listing includes no starter-culture guarantee, no mixed-sex count and no viability period for reproduction. Its purpose is feeding. Anyone planning a culture should obtain a named, legal source with documented water parameters and biosecurity guidance rather than using a food pack opportunistically.

Delivery and arrival checks

Live feed requires different handling from dry or frozen food. Delivery availability, dispatch days and weather restrictions should be checked at checkout and in the current live-feed terms. Do not assume the live-fish guarantee, frozen-food cold chain or a general next-day statement applies in exactly the same way to this product.

Be available to receive the parcel. Inspect the outer packaging and all bags before opening. If there is a problem, follow the evidence process in the current policy promptly. Clear photographs of the sealed bag, label, condition and shipping packaging are more useful than a report made after the contents have been poured into an aquarium.

The site advertises 10% off a first eligible order. Eligibility and exclusions are governed by the current promotion and checkout, so the discount is not added to the product title or presented as a permanent price reduction.

Buyer checklist

Confirm before ordering	Why it matters
Your target animals can take the prey size	Acceptance and safe swallowing are not universal
You can use 25 bags promptly	No verified long storage life is published
You understand this is live, not frozen	Handling and delivery differ
You accept an unidentified mysid trade product	Species, salinity and culture source are not supplied
You have fine feeding and removal equipment	Target feeding reduces waste and packing-water transfer
You will not release or culture leftovers	Responsible biosecurity protects native waters

Live Mysis Fish Food FAQs

Is this product live or frozen?

It is the live 25 x 90ml PE-bag listing. Frozen mysis flat plates and blisters are separate products.

Does the pack contain 25 mysis shrimp?

No. It contains 25 bags. No fixed animal count, drained biomass or net weight is stated.

Is each bag 90ml of pure mysids?

No. The 90ml figure is the supplier's bag format and includes holding water.

Which mysid species is supplied?

The residual source record does not name a species. The product must not be relabelled as Mysis relicta or any marine or freshwater species without evidence.

Is PE Mysis the brand?

No brand is documented. In this historical wording, PE refers to the plastic bag format, not a frozen-food brand claim.

Are live mysids a complete fish diet?

No. Use them as a varied supplementary feed within a complete species-appropriate nutrition plan unless a qualified protocol says otherwise.

Are mysids always more nutritious than brine shrimp?

No universal comparison can be made. Results depend on species, life stage, culture diet and enrichment, and this pack has no guaranteed analysis.

Can I feed them to seahorses or mandarins?

Only after checking the exact animal's prey size and specialist care plan. This unidentified pack is not automatically suitable for every seahorse or mandarin.

How should I store the bags?

Follow the batch-specific instructions supplied with the delivery. No verified temperature or storage duration is present in the current source record.

Can I freeze unused live bags?

Do not convert the product at home unless the manufacturer explicitly provides a safe freezing instruction. Use a purpose-made frozen mysis product instead.

Can I start a culture from the bags?

No culture suitability is promised. The species and water requirements are unknown, and live aquatic organisms must never be released outdoors.

Does a live-arrival policy apply?

Use the current product-specific live-feed delivery and evidence terms shown with the order. Do not assume live-fish or frozen-food terms are identical.

Evidence and further reading

The general discussion of mysids as live feed and their variable nutritional value was checked against the open-access review Adaptation and potential culture of wild amphipods and mysids as potential live feed in aquaculture. General live-feed principles were compared with the FAO Manual on the production and use of live food for aquaculture. UK biosecurity context was checked against Cefas and Defra guidance on live aquatic animals. None of those sources supplies a species or guaranteed analysis for this particular residual pack.

Ordering from Tropical Fish Co

This listing keeps the useful historical pack information while removing claims the source cannot support. It tells you that the product is live, explains the 25 x 90ml format, separates it from genuine frozen mysis and discloses the limits of the tiny supplier image. When a restock is confirmed, the live inventory and current batch instructions should be checked again before purchase.