![]() ![]() Similarly, the transportation of spat of the blue mussel, Mytilus edulis, for more than 24 hours can compromise their physiological and nutritional condition. The physiological and nutritional condition of these spat during transportation has been reported to be compromised and may affect their subsequent performance once seeded onto coastal mussel farms. Ī large number of mussel spat, consisting of 200 to 2 million of spat per kg of spat material (e.g., seaweed fragments and debris) are routinely harvested from Ninety Mile Beach and transported to mussel farms across the country of New Zealand. In 2019, the supply of spat from the wild has contributed to the production of 98 t of market-size mussels (4.7% of global mussel production in the same year), with the total export reaching∼NZ$300 million. In New Zealand, an intermittent supply of juveniles or spat of the green-lipped mussel, Perna canaliculus, that are attached onto drifting seaweed that is washed ashore at Ninety Mile Beach has supplied around 70% of spat resource for all mussel farms in the country for at least 40 years. ![]() The suspended culture of mussels is normally reliant on seeding the farms with juvenile mussels, known as spat, which are most commonly harvested from the wild using a variety of techniques. The results indicate that both concentrated microalgal feeds (SD and LPB) are effective at replacing live microalgae by up to 50% without compromising the survival and nutritional profile (AFDW, protein, lipid, and carbohydrate content) of juvenile green-lipped mussels and are therefore a useful resource for improving the efficiency of production. Proximate analysis (i.e., crude ash-free dry weight, crude protein, crude lipid, and carbohydrate) showed that only the proportion of carbohydrate content of spat was influenced by feeding treatments, with the mean total carbohydrate content of mussels tending to decrease with increasing levels of replacement of live microalgae. The overall final size of spat tended to decrease with the increasing level replacement of live microalgae. The mortality of mussels fed with 100% LPB replacement was significantly higher than the mortality of mussels fed at the lower levels of replacement, i.e., 0 and 25%. Shellfish Diet 1800® (called SD) and LPB™ Frozen Shellfish Diet® (called LPB) were fed to juvenile green-lipped mussels ( Perna canaliculus) at five levels of substitution for live microalgae (i.e., 0, 25, 50, 75, and 100%) for 27 days. This study investigated the potential use of two concentrated microalgal diets at a range of levels of substitution with live microalgae. Replacement diets have been applied in bivalve nursery culture to replace live microalgae with varying success. The nursery culture of bivalves typically relies on the feeding of costly live microalgae, while the use of natural sources of phytoplankton for feed is uncertain due to their variable quality and abundance. ![]()
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