Ontogenetic changes in digestive enzyme activity and biochemical indices of larval and postlarval European lobster (Homarus gammarus, L)

Abstract

General rightsCopyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights. Users may download and print one copy of any publication from the public portal for the purpose of private study or research.  You may not further distribute the material or use it for any profit-making activity or commercial gain  You may freely distribute the URL identifying the publication in the public portal If you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim.

Influence of pseudo-green water on growth, colouration, and survival in European lobster (Homarus gammarus) larvae

“…Excluding the control, D resulted in the smallest total (12.97 ± 0.59 mm) and carapace length (5.13 ± 0.26 mm), compared to T + N, which had the highest total (14.36 ± 0.43 mm) and carapace length (6.08 ± 0.93 mm), equating to a 10.7 % and an 18.5 % increase in growth respectively. Past research studies reveal that dietary lipid content provides an important contribution to European lobster larvae nutritional profiles for energy and metabolic purposes (Becker, 2013; Goncalves et al, 2022). Nannochloropsis sp.…”

The Effect of UV Irradiation on Rearing Water Quality, Growth, and Survival of European Lobster (Homarus gammarus, L.) Larvae

“…Te experiment was conducted at the facilities of the National Institute of Aquatic Sciences (DTU Aqua), Section for Aquaculture, in Hirtshals, Denmark. Lobster larvae were obtained from three ovigerous females captured along the Skagerrak coast in North Jutland, Denmark, and reared as described in detail by Goncalves et al [13]. Briefy, newly hatched larvae were collected from broodstock tanks with a net and transferred to six 46 L cylindroconical transparent acrylic tanks, which were part of a fow-through system.…”

“…Higher survival rates have been reported in studies where H. gammarus larvae were reared individually [10,12], but such a strategy is only operable in small-scale experimental trials. A single female can hatch a high number of larvae per spawning season, up to 15000 individuals according to Goncalves et al [13], which would be neither practical nor feasible to cultivate individually. Te high mortality rate during larval development is, to a great extent, explained by the species strong cannibalistic behavior [11].…”

European lobster Homarus gammarus aquaculture: Technical developments, opportunities and requirements

“…Unfortunately, challenges remain in locating sufficient wild H. gammarus larvae in plankton trawls, or Early Benthic Phase juveniles for detailed and unbiased composition analysis, although investigation of digestive enzyme production during decapod larval stages is a promising approach. 110,111 Live feeds such as Artemia salina are likely to be beneficial by providing an additional visual stimulus, superior to a static pellet. However, the size difference between lobster larvae and A. salina nauplii suggests providing larger (i.e.…”

“…A species or stage‐specific formulated feed composition and size is required, especially if nutrient requirements alter as larvae develop 110 with the nutritional requirements for each life stage yet to be identified. Unfortunately, challenges remain in locating sufficient wild H. gammarus larvae in plankton trawls, or Early Benthic Phase juveniles for detailed and unbiased composition analysis, although investigation of digestive enzyme production during decapod larval stages is a promising approach 110,111 . Live feeds such as Artemia salina are likely to be beneficial by providing an additional visual stimulus, superior to a static pellet.…”