Porcupine Fish
A few blue morph spot-fin porcupine fish (Diodon hystrix) have frequented the river this year. Like puffer fish these fish can inflate their bodies by swallowing water or air to form a spiny ball to deter predators. The scales are modified to sharp spines, much larger than those of a puffer fish. These fish spawn in monogamous pairs. During spawning, just before dusk, the female will begin to hover just above the sea bed and flash their white belly and flanks at the male. The male follows her every move, and gently nudges at her abdomen whenever she pauses. The female then slowly rises through the water column with the male close behind. Pressing his snout against the female’s abdomen, the male pushes her to the surface. At the surface the female then moves forward and vigorously splashes on the surface whilst releasing her eggs, whilst the male fertilizes close behind her.