{"id":6885,"date":"2024-10-03T19:34:00","date_gmt":"2024-10-03T19:34:00","guid":{"rendered":"https:\/\/www.bluefarmenvironment.com\/?post_type=project&#038;p=6885"},"modified":"2026-05-12T13:09:55","modified_gmt":"2026-05-12T13:09:55","slug":"prefattening-manila-clam","status":"publish","type":"project","link":"https:\/\/www.bluefarmenvironment.com\/en\/project\/prefattening-manila-clam\/","title":{"rendered":"Pre-fattening Manila clam"},"content":{"rendered":"<p>[et_pb_section fb_built=&#8221;1&#8243; _builder_version=&#8221;4.16&#8243; global_colors_info=&#8221;{}&#8221;][et_pb_row admin_label=&#8221;Contenuto scheda&#8221; _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; custom_padding=&#8221;0px|||||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text quote_border_color=&#8221;#0e88b3&#8243; admin_label=&#8221;H3 + Testo&#8221; _builder_version=&#8221;4.25.2&#8243; link_text_color=&#8221;#0e88b3&#8243; header_3_line_height=&#8221;1.4em&#8221; header_4_text_color=&#8221;#003f72&#8243; header_4_font_size=&#8221;20px&#8221; header_4_line_height=&#8221;1.4em&#8221; header_5_font=&#8221;|||on|||||&#8221; header_5_line_height=&#8221;1.4em&#8221; background_color=&#8221;#eff0f3&#8243; vertical_offset_tablet=&#8221;0&#8243; horizontal_offset_tablet=&#8221;0&#8243; custom_padding=&#8221;3%|5%|3%|5%|true|true&#8221; custom_padding_tablet=&#8221;5%|7%|5%|7%|true|true&#8221; custom_padding_phone=&#8221;&#8221; custom_padding_last_edited=&#8221;on|phone&#8221; header_3_font_size_tablet=&#8221;20px&#8221; header_3_font_size_phone=&#8221;18px&#8221; header_3_font_size_last_edited=&#8221;on|desktop&#8221; header_4_font_size_tablet=&#8221;18px&#8221; header_4_font_size_phone=&#8221;16px&#8221; header_4_font_size_last_edited=&#8221;on|phone&#8221; z_index_tablet=&#8221;0&#8243; text_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; text_text_shadow_vertical_length_tablet=&#8221;0px&#8221; text_text_shadow_blur_strength_tablet=&#8221;1px&#8221; link_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; link_text_shadow_vertical_length_tablet=&#8221;0px&#8221; link_text_shadow_blur_strength_tablet=&#8221;1px&#8221; ul_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; ul_text_shadow_vertical_length_tablet=&#8221;0px&#8221; ul_text_shadow_blur_strength_tablet=&#8221;1px&#8221; ol_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; ol_text_shadow_vertical_length_tablet=&#8221;0px&#8221; ol_text_shadow_blur_strength_tablet=&#8221;1px&#8221; quote_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; quote_text_shadow_vertical_length_tablet=&#8221;0px&#8221; quote_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_2_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_2_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_2_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_3_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_3_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_3_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_4_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_4_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_4_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_5_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_5_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_5_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_6_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_6_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_6_text_shadow_blur_strength_tablet=&#8221;1px&#8221; box_shadow_horizontal_tablet=&#8221;0px&#8221; box_shadow_vertical_tablet=&#8221;0px&#8221; box_shadow_blur_tablet=&#8221;40px&#8221; box_shadow_spread_tablet=&#8221;0px&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h3>The service<\/h3>\n<h4 style=\"text-align: justify;\">Bioenergetic model for seed pre-fattening of Manila clam (<em>Ruditapes philippinarum<\/em>) \u2013 ended<\/h4>\n<p style=\"text-align: justify;\">\n<div class=\"page\" title=\"Page 4\">\n<div class=\"layoutArea\">\n<div class=\"column\">\n<p style=\"text-align: justify;\">Manila clam (<em>Ruditapes philippinarum<\/em>) farming in the lagoons and fish valleys of the Veneto region represents one of the most economically significant aquaculture activities in the Northern Adriatic. A critical step in the production process is the <strong>pre-fattening phase<\/strong>: hatchery-produced seed, at an average length of approximately 1 mm, is placed in upward-flow systems known as &#8220;upwelling&#8221; units and must reach 4 mm before being transferred to lower-energy systems \u2014 valley-based flupsy units or suspended lanterns in the lagoon \u2014 where pre-fattening continues until approximately 15 mm. Management of upwelling units (seeding density and water flow rate) is still largely empirical, with no predictive tools available to optimise yield.<\/p>\n<div class=\"page\" title=\"Page 5\">\n<div class=\"layoutArea\">\n<div class=\"column\"><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][et_pb_row admin_label=&#8221;Contenuto scheda&#8221; _builder_version=&#8221;4.16&#8243; background_size=&#8221;initial&#8221; background_position=&#8221;top_left&#8221; background_repeat=&#8221;repeat&#8221; custom_padding=&#8221;0px|||||&#8221; global_colors_info=&#8221;{}&#8221;][et_pb_column type=&#8221;4_4&#8243; _builder_version=&#8221;4.16&#8243; custom_padding=&#8221;|||&#8221; global_colors_info=&#8221;{}&#8221; custom_padding__hover=&#8221;|||&#8221;][et_pb_text quote_border_color=&#8221;#0e88b3&#8243; admin_label=&#8221;H3 + Testo&#8221; _builder_version=&#8221;4.27.6&#8243; link_text_color=&#8221;#0e88b3&#8243; header_3_line_height=&#8221;1.4em&#8221; header_4_text_color=&#8221;#003f72&#8243; header_4_font_size=&#8221;20px&#8221; header_4_line_height=&#8221;1.4em&#8221; header_5_font=&#8221;|||on|||||&#8221; header_5_line_height=&#8221;1.4em&#8221; background_color=&#8221;#eff0f3&#8243; vertical_offset_tablet=&#8221;0&#8243; horizontal_offset_tablet=&#8221;0&#8243; custom_padding=&#8221;3%|5%|3%|5%|true|true&#8221; custom_padding_tablet=&#8221;5%|7%|5%|7%|true|true&#8221; custom_padding_phone=&#8221;&#8221; custom_padding_last_edited=&#8221;on|phone&#8221; header_3_font_size_tablet=&#8221;20px&#8221; header_3_font_size_phone=&#8221;18px&#8221; header_3_font_size_last_edited=&#8221;on|desktop&#8221; header_4_font_size_tablet=&#8221;18px&#8221; header_4_font_size_phone=&#8221;16px&#8221; header_4_font_size_last_edited=&#8221;on|phone&#8221; z_index_tablet=&#8221;0&#8243; text_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; text_text_shadow_vertical_length_tablet=&#8221;0px&#8221; text_text_shadow_blur_strength_tablet=&#8221;1px&#8221; link_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; link_text_shadow_vertical_length_tablet=&#8221;0px&#8221; link_text_shadow_blur_strength_tablet=&#8221;1px&#8221; ul_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; ul_text_shadow_vertical_length_tablet=&#8221;0px&#8221; ul_text_shadow_blur_strength_tablet=&#8221;1px&#8221; ol_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; ol_text_shadow_vertical_length_tablet=&#8221;0px&#8221; ol_text_shadow_blur_strength_tablet=&#8221;1px&#8221; quote_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; quote_text_shadow_vertical_length_tablet=&#8221;0px&#8221; quote_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_2_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_2_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_2_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_3_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_3_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_3_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_4_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_4_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_4_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_5_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_5_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_5_text_shadow_blur_strength_tablet=&#8221;1px&#8221; header_6_text_shadow_horizontal_length_tablet=&#8221;0px&#8221; header_6_text_shadow_vertical_length_tablet=&#8221;0px&#8221; header_6_text_shadow_blur_strength_tablet=&#8221;1px&#8221; box_shadow_horizontal_tablet=&#8221;0px&#8221; box_shadow_vertical_tablet=&#8221;0px&#8221; box_shadow_blur_tablet=&#8221;40px&#8221; box_shadow_spread_tablet=&#8221;0px&#8221; global_colors_info=&#8221;{}&#8221;]<\/p>\n<h3>Bluefarm&#8217;s role<\/h3>\n<div class=\"page\" title=\"Page 4\">\n<div class=\"layoutArea\">\n<div class=\"column\">\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Veneto Agricoltura (Veneto Region&#8217;s Agency for Innovation in the Primary Sector) directly commissioned Bluefarm to provide data analysis and develop a predictive model for Manila clam seed pre-fattening in fish valleys and lagoonal environments.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The work was structured in two phases:<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>1. Experimental plan<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Veneto Agricoltura conducted a structured experimental programme at the <strong>Centro Ittico Sperimentale di Valle Bonello (Rovigo)<\/strong>, systematically varying the two main controllable parameters of the upwelling system \u2014 biomass density and water flow rate \u2014 across two distinct seasons: autumn 2022 (October\u2013December) and spring 2023 (April\u2013June). Trials were started with seed ranging from 1.5 to 2.5 mm in length, at initial densities of approximately 100,000, 200,000 and 300,000 individuals per upwelling unit, and at two flow rates (high flow: 20 ml cm\u207b\u00b2 min\u207b\u00b9; low flow: 10 ml cm\u207b\u00b2 min\u207b\u00b9). Environmental variables \u2014 water temperature, dissolved oxygen and chlorophyll a concentration \u2014 were monitored daily, and biometric parameters (weight and length) were sampled fortnightly.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\"><strong>2. Model development<\/strong><\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Bluefarm developed, in the R programming environment, a <strong>dynamic bioenergetic model<\/strong> for simulating individual growth of Manila clam during the first pre-fattening stage (1\u20134 mm). The model is based on a system of ordinary differential equations (ODEs) describing the temporal evolution of the individual energy budget \u2014 the difference between anabolism (energy assimilated through filtration) and catabolism (energy consumed for vital functions), known as <em>Scope for Growth<\/em> \u2014 and of water quality within the upwelling unit.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">A key novelty of the model with respect to existing literature is the introduction of an exponential function modulating the individual filtration rate as a function of biomass density and upward water flow velocity. This function captures the observation that, as density increases, clams tend to aggregate and reduce their individual filtration rate, and that this effect is partially counteracted by higher flow rates \u2014 which increase turbulence and reduce inter-individual contact. The model produces predictions of weight, length and total biomass growth, as well as the percentage of individuals exceeding the 4 mm threshold.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">The model was applied to experimental data from both seasons, achieving good agreement with observations in 11 out of 12 trials. The residual case (upper sieve level in the double-sieve spring trial) highlighted possible selective depletion of assimilable phytoplankton by the lower clam layer, pointing to a direction for further research.<\/p>\n<p class=\"font-claude-response-body break-words whitespace-normal leading-[1.7]\">Results indicate that densities of 100\u2013200 individuals\/cm\u00b2 at high flow (~20 ml min\u207b\u00b9 cm\u207b\u00b2) optimise growth in spring, a season when \u2014 despite lower chlorophyll a concentrations compared to autumn \u2014 growth rates and survival were significantly better, suggesting higher energy availability linked to the seasonal composition of the seston.<\/p>\n<div class=\"page\" title=\"Page 5\">\n<div class=\"layoutArea\">\n<div class=\"column\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.bluefarmenvironment.com\/wp-content\/uploads\/2026\/05\/Screenshot_6.png\" width=\"564\" height=\"430\" alt=\"\" class=\"wp-image-7236 alignnone size-full\" style=\"display: block; margin-left: auto; margin-right: auto;\" srcset=\"https:\/\/www.bluefarmenvironment.com\/wp-content\/uploads\/2026\/05\/Screenshot_6.png 564w, https:\/\/www.bluefarmenvironment.com\/wp-content\/uploads\/2026\/05\/Screenshot_6-480x366.png 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) 564px, 100vw\" \/><em style=\"font-size: 16px; text-align: center;\"><\/em><\/div>\n<div class=\"column\"><em style=\"font-size: 16px; text-align: center;\"><\/em><\/div>\n<div class=\"column\"><em style=\"font-size: 16px; text-align: center;\"><\/em><\/div>\n<div class=\"column\"><em style=\"font-size: 16px; text-align: center;\"><\/em><\/div>\n<div class=\"column\"><em style=\"font-size: 16px; text-align: center;\"><\/em><\/div>\n<div class=\"column\"><em style=\"font-size: 16px; text-align: center;\"><\/em><\/div>\n<div class=\"column\"><em style=\"font-size: 16px; text-align: center;\"><\/em><\/div>\n<div class=\"column\"><em style=\"font-size: 16px; text-align: center;\"><\/em><\/div>\n<div class=\"column\"><em style=\"font-size: 16px; text-align: center;\"><\/em><\/div>\n<div class=\"column\"><em style=\"font-size: 16px; text-align: center;\"><\/em><\/div>\n<div class=\"column\" style=\"text-align: center;\"><\/div>\n<div class=\"column\" style=\"text-align: center;\"><em style=\"font-size: 16px; text-align: center;\"><\/em><\/div>\n<div class=\"column\" style=\"text-align: center;\"><em style=\"font-size: 16px; text-align: center;\"><\/em><\/div>\n<div class=\"column\" style=\"text-align: center;\"><\/div>\n<div class=\"column\" style=\"text-align: center;\"><em style=\"font-size: 16px; text-align: center;\">Upwelling-type system used in pre-fattening tests conducted at the Centro Ittico Sperimentale di Valle Bonello (Photo provided by the Client).<\/em><\/div>\n<div class=\"column\" style=\"text-align: center;\"><em><\/em><\/div>\n<div class=\"column\" style=\"text-align: center;\"><em><\/em><\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<\/div>\n<p>[\/et_pb_text][\/et_pb_column][\/et_pb_row][\/et_pb_section]<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The service Bioenergetic model for seed pre-fattening of Manila clam (Ruditapes philippinarum) \u2013 ended Manila clam (Ruditapes philippinarum) farming in the lagoons and fish valleys of the Veneto region represents one of the most economically significant aquaculture activities in the Northern Adriatic. A critical step in the production process is the pre-fattening phase: hatchery-produced seed, [&hellip;]<\/p>\n","protected":false},"author":65,"featured_media":5850,"comment_status":"open","ping_status":"closed","template":"","meta":{"_et_pb_use_builder":"on","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"project_category":[45],"project_tag":[],"class_list":["post-6885","project","type-project","status-publish","has-post-thumbnail","hentry","project_category-innovative-services"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pre-fattening Manila clam - Bluefarm<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.bluefarmenvironment.com\/en\/project\/prefattening-manila-clam\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pre-fattening Manila clam - Bluefarm\" \/>\n<meta property=\"og:description\" content=\"The service Bioenergetic model for seed pre-fattening of Manila clam (Ruditapes philippinarum) \u2013 ended Manila clam (Ruditapes philippinarum) farming in the lagoons and fish valleys of the Veneto region represents one of the most economically significant aquaculture activities in the Northern Adriatic. 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