{"product_id":"rectangle-triggerfish-rhinecanthus-rectangulus","title":"Rectangle Triggerfish - Rhinecanthus rectangulus","description":"\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eRectangle Triggerfish (Rhinecanthus rectangulus)\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Rectangle Triggerfish (\u003c\/span\u003e\u003cem\u003e\u003cspan\u003eRhinecanthus rectangulus\u003c\/span\u003e\u003c\/em\u003e\u003cspan\u003e) is a bold and highly distinctive Indo-Pacific marine fish recognised by its pale body, vivid blue and yellow facial lines, dark wedge-shaped tail marking and prominent black rectangular patch across the rear flanks. Also known as the Reef Triggerfish, Wedgetail Triggerfish or Humuhumunukunukuāpuaʻa, it inhabits shallow coral reefs, rocky shorelines and surge zones where it searches for crustaceans, molluscs and other hard-shelled prey. Intelligent and full of character, this powerful triggerfish requires a large fish-only aquarium, robust tank mates and an experienced keeper prepared for its territorial behaviour.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eCommon Name:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eRectangle Triggerfish, Rectangular Triggerfish, Reef Triggerfish, Wedgetail Triggerfish, Wedge-Tail Triggerfish, Humuhumunukunukuāpuaʻa\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eScientific Name (Latin):\u003c\/strong\u003e\u003cbr\u003e\u003cem\u003e\u003cspan\u003eRhinecanthus rectangulus\u003c\/span\u003e\u003c\/em\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eMaximum Size:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eUp to approximately 30 cm in total length. Aquarium specimens may remain somewhat smaller, but adults are deep-bodied, powerful fish requiring substantial permanent accommodation.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eWater Type:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eMarine\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eOrigin \/ Natural Habitat:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eWidely distributed throughout the tropical Indo-Pacific, including the eastern Indian Ocean, Southeast Asia, southern Japan, northern Australia, Hawaii and numerous central and eastern Pacific islands.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIt is commonly associated with shallow coral and rocky reefs, reef flats, lagoons and exposed surge zones. Individuals often establish territories around caves, coral structures or rocky crevices and forage across nearby sand and rubble.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eWater Parameters:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eTemperature: 24–28°C\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003epH Range: 8.1–8.4\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eSalinity: 1.020–1.025 SG\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eTemperament:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eAggressive, territorial and highly assertive. Juveniles may initially appear manageable in a community aquarium, but behaviour often becomes substantially more dominant as the fish matures.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Rectangle Triggerfish may attack smaller fish, similarly shaped triggerfish and newly introduced tank mates. It should be kept with robust species of a comparable size that can tolerate its energetic and territorial nature.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eDiet:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eA carnivorous omnivore that naturally feeds on crustaceans, molluscs, sea urchins, worms, small fish, algae and other benthic organisms.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eIn the aquarium, provide a varied diet of shell-on prawns, mussels, clams, cockles, crab, squid, krill and pieces of marine fish. Marine algae and quality omnivore pellets may also be included.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eRegular hard-shelled foods are important because the teeth grow continuously and require natural wear. Feed controlled portions once or twice daily, adjusting quantity according to the fish’s size and body condition.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eMinimum Tank Size:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eA minimum aquarium volume of approximately 700 litres is recommended for long-term care, with a tank length of at least 180 cm strongly preferred.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eA larger aquarium is advisable when keeping the fish alongside other large or territorial marine species. Open swimming space and a broad footprint are more important than aquarium height alone.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eBehaviour \u0026amp; Activity:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eAn active and highly inquisitive daytime fish that patrols the aquarium, investigates equipment and searches rockwork and substrate for food.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Rectangle Triggerfish uses its powerful jaws to turn over rubble, bite rocks and crush hard-shelled prey. It may rearrange unsecured decorations, move small rocks and excavate around preferred caves.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eWhen threatened or resting, it raises its strong first dorsal spine and locks it into place with a smaller second spine. This allows the fish to wedge itself securely inside a cave or crevice where predators cannot easily remove it.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eEstablished specimens may recognise their keeper and become highly responsive at feeding time. However, large individuals may also bite hands or maintenance tools, so care is necessary when working inside the aquarium.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eReef Safe:\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"text-decoration: underline;\"\u003eNot Reef Safe\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe Rectangle Triggerfish is unsuitable for a conventional reef aquarium. It will prey upon ornamental shrimps, crabs, snails, clams, worms, sea urchins and other mobile invertebrates.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCorals may also be bitten, overturned or damaged while the fish searches for food and rearranges rockwork. It is best maintained in a large fish-only or fish-only-with-live-rock aquarium.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eSpecial Requirements or Care Notes:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eProvide extensive open swimming space alongside large caves and stable rock structures. All rockwork should be securely positioned because this strong fish may move rubble or excavate around the base of decorations.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003ePowerful biological filtration, efficient protein skimming and strong oxygenation are essential. Triggerfish are messy feeders and produce a considerable waste load.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eProtected heaters, cables and internal equipment are strongly recommended. An inquisitive triggerfish may bite electrical cables, airline tubing, pump fittings and other exposed components.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eA tightly fitted aquarium cover should be used. Although not among the most frequent jumpers, a frightened or excited specimen may leave an uncovered aquarium.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eChoose tank mates conservatively. Avoid small fish, ornamental invertebrates, timid species and long-finned fish likely to be harassed. Other aggressive triggerfish may also fight severely unless housed in an exceptionally large system.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eThe fish should normally be added after peaceful or moderately assertive tank mates so it cannot immediately claim the entire aquarium as its territory.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eNever hand-feed an adult specimen. Its strong teeth can inflict a serious bite, and the fish may associate hands with food. Use long feeding tongs and remain aware of its position during aquarium maintenance.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eProvide hard-shelled marine foods regularly to support natural tooth wear. Overgrown teeth can interfere with feeding and may require specialist veterinary attention.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003eCare is needed during capture because the locking dorsal spine can become caught in conventional nets. A rigid submerged container is generally safer when moving the fish.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cstrong\u003eSuitable for:\u003c\/strong\u003e\u003cbr\u003e\u003cspan\u003eExperienced fishkeepers\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"isSelectedEnd\"\u003e\u003cspan\u003e\u003cstrong\u003eAvailability\u003c\/strong\u003e:\u003c\/span\u003e\u003cbr\u003e\u003cspan\u003eOccasional in trade\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003e\u003cstrong\u003eAll images are a visual representation of the fish you will receive, made to be as accurate as possible. Please note that Mother Nature is a wonderful thing, and variation in patterns and colours will occur — that is part of the unique beauty of these animals.\u003c\/strong\u003e\u003c\/em\u003e\u003c\/p\u003e","brand":"Aqua Group","offers":[{"title":"Small","offer_id":46926719189165,"sku":"AG-104181","price":35.0,"currency_code":"GBP","in_stock":false},{"title":"Medium","offer_id":46926719221933,"sku":"AG-104182","price":50.0,"currency_code":"GBP","in_stock":false},{"title":"Large","offer_id":46926719254701,"sku":"AG-104183","price":65.0,"currency_code":"GBP","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0543\/0391\/6205\/files\/RectangleTriggerfish-Rhinecanthusrectangulus_1bc87a64-faf2-4916-93cc-1d057c1050a5.jpg?v=1785162359","url":"https:\/\/aquagroup.co.uk\/products\/rectangle-triggerfish-rhinecanthus-rectangulus","provider":"Aqua Group","version":"1.0","type":"link"}