{"id":146,"date":"2016-05-19T10:33:56","date_gmt":"2016-05-19T17:33:56","guid":{"rendered":"https:\/\/sites.evergreen.edu\/vms-spring\/?p=146"},"modified":"2016-06-03T17:35:03","modified_gmt":"2016-06-04T00:35:03","slug":"venerupis-philippinarum-manila-clam","status":"publish","type":"post","link":"https:\/\/sites.evergreen.edu\/vms-spring\/venerupis-philippinarum-manila-clam\/","title":{"rendered":"Venerupis philippinarum"},"content":{"rendered":"<p>&nbsp;<\/p>\n<h3><strong><em>Common names:<\/em><\/strong> Japanese littleneck clam, manila clam, steamer clam<\/h3>\n<h4 style=\"text-align: center\"><strong>Author: Justin Roberts<\/strong><\/h4>\n<p><!--more--><\/p>\n<h4 style=\"text-align: center\"><strong>Physical description and physiology<\/strong><\/h4>\n<p><em>Venerupis philippinarum<\/em>, commonly called Japanese littleneck clams, are bivalves similar in size and physical appearance as the native littleneck clams Leukoma staminea. Japanese littlenecks have two outer shells (valves) connected by a hinge, with internal ligaments used to open and close the shells.They have an oblong shell with a slightly higher length to width ratio than the native species.\u00a0The shells of <em>Venerupis philippinarum<\/em> have concentric rings across the surface with ridges radiating across the rings and outward to the edges of the shell. The inside of the shell is smooth. Japanese littlenecks can grow to 3-4 inches in length as mature adults. All clam species contain internal organs that make up the body inside the protective shell. Internal structures include a heart, stomach, gonads, kidney, intestines, mouth, abductor muscles, and gills to aid in respiratory function (Shean, 2011).<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/player.vimeo.com\/video\/167942053\" width=\"676\" height=\"507\" frameborder=\"0\" title=\"monograph Justin\" webkitallowfullscreen mozallowfullscreen allowfullscreen><\/iframe><\/p>\n<h4 style=\"text-align: center\"><strong>Reproductive strategies<\/strong><\/h4>\n<p style=\"text-align: left\">Japanese littleneck clams are dioecious \u2013 there are male and female individuals, each producing either egg or sperm. Individuals become sexually mature in the first to third year of age.\u00a0This can vary depending on\u00a0location and size of shell. In Hood Canal, Puget Sound, WA., research has shown that clams are sexually mature when shell length is 5-10 mm. However, most individuals do not spawn until shell length is at least 20 mm (Holland and Chew, 1974).<\/p>\n<p><div id=\"attachment_517\" style=\"width: 155px\" class=\"wp-caption alignright\"><img aria-describedby=\"caption-attachment-517\" loading=\"lazy\" class=\"wp-image-517\" src=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/Trocephore-1-e1464062352406.jpg\" alt=\"planktonic larva of certain invertebrates, including some mollusks having a roughly spherical body, a band of cilia, and a spinning motion\" width=\"145\" height=\"145\" srcset=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/Trocephore-1-e1464062352406.jpg 260w, https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/Trocephore-1-e1464062352406-150x150.jpg 150w\" sizes=\"(max-width: 145px) 100vw, 145px\" \/><p id=\"caption-attachment-517\" class=\"wp-caption-text\">Trocephore, planktonic larva a roughly spherical body, a band of cilia, and a spinning motion.<\/p><\/div> <div id=\"attachment_515\" style=\"width: 142px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/img008-e1464106089211.jpg\" rel=\"attachment wp-att-515\"><img aria-describedby=\"caption-attachment-515\" loading=\"lazy\" class=\"wp-image-515\" src=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/img008-e1464106089211-274x300.jpg\" alt=\"Clams are \u201cbroadcast\u201d spawners. That is, they release eggs and sperm into the water column and let nature take their course.\" width=\"132\" height=\"145\" srcset=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/img008-e1464106089211-274x300.jpg 274w, https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/img008-e1464106089211.jpg 282w\" sizes=\"(max-width: 132px) 100vw, 132px\" \/><\/a><p id=\"caption-attachment-515\" class=\"wp-caption-text\">Clams are \u201cbroadcast\u201d spawners. They release eggs and sperm into the water column and let nature take their course.<\/p><\/div><\/p>\n<p style=\"text-align: left\">As broadcast spawners, clams generate high numbers of gametes that are released once an individual is sexually mature. High fecundity increases the chances for large numbers of larvae and overall recruitment for the population. Reports indicate Japanese littleneck clam fecundity ranges from\u00a04.32<sup>105\u00a0<\/sup><span style=\"line-height: 1.5\">eggs to\u00a0<\/span>2.35<sup>106\u00a0<\/sup><span style=\"line-height: 1.5\">eggs depending on shell length (Yap, 1977).<\/span><\/p>\n<div id=\"attachment_533\" style=\"width: 158px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/Veliger1.jpg\" rel=\"attachment wp-att-533\"><img aria-describedby=\"caption-attachment-533\" loading=\"lazy\" class=\"wp-image-533\" src=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/Veliger1-300x284.jpg\" alt=\"Veliger develop many of the characteristic features of the adult muscular foot, eyes, rhinophores, a fully developed mouth, and a spiral shell.\" width=\"148\" height=\"140\" srcset=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/Veliger1-300x284.jpg 300w, https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/Veliger1.jpg 374w\" sizes=\"(max-width: 148px) 100vw, 148px\" \/><\/a><p id=\"caption-attachment-533\" class=\"wp-caption-text\">Veliger develop many of the characteristic features of the adult clam.<\/p><\/div>\n<h4 style=\"text-align: center\">\u00a0<strong>Manila clam culture in Puget Sound<\/strong><\/h4>\n<div id=\"attachment_537\" style=\"width: 155px\" class=\"wp-caption alignleft\"><a href=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/juvenile1.jpg\" rel=\"attachment wp-att-537\"><img aria-describedby=\"caption-attachment-537\" loading=\"lazy\" class=\"wp-image-537\" src=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/juvenile1-300x290.jpg\" alt=\"juvenile1\" width=\"145\" height=\"140\" srcset=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/juvenile1-300x290.jpg 300w, https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/juvenile1.jpg 551w\" sizes=\"(max-width: 145px) 100vw, 145px\" \/><\/a><p id=\"caption-attachment-537\" class=\"wp-caption-text\">Juvenile clam<\/p><\/div>\n<p>The concern for the Puget Sound that has been raised in the last decade are the increase of harmful algal blooms that have impacts on shellfish harvest. The south Puget Sound has a high eutrophication symptoms and are getting worse due to increasing human population pressure in the coastal areas. We are going to see decrease in eutrophication symptoms because we want to protect and enhance our resources so that we can limit the nutrient loading from local population watershed to the bay areas. Looking at the commitment for environmental stewardship will help with promoting clean water also increasing job opportunities for industries and citizens around Puget Sound (Camille &amp; Joao, et al., 2014).<\/p>\n<p><a href=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/21-century1.jpg\" rel=\"attachment wp-att-534\"><img loading=\"lazy\" class=\"alignleft wp-image-534 size-full\" src=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/21-century1.jpg\" alt=\"21 century\" width=\"1200\" height=\"927\" srcset=\"https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/21-century1.jpg 1200w, https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/21-century1-300x232.jpg 300w, https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/21-century1-768x593.jpg 768w, https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/21-century1-1024x791.jpg 1024w, https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/21-century1-945x730.jpg 945w, https:\/\/sites.evergreen.edu\/vms-spring\/wp-content\/uploads\/sites\/209\/2016\/05\/21-century1-600x464.jpg 600w\" sizes=\"(max-width: 1200px) 100vw, 1200px\" \/><\/a>The things that I learned or understood about my research that one Manila clam during its culture cycle clears almost 29 m\u00b3 of water and removes over 1 g of nitrogen, more than 4% of the live weight produced. That a simple clam could also produce so much revenue in fact we can place a price on the Manila clam and how it can be important to the human society. In the US, Manila clam produces a potential nutrient credit trading value of US $41,000per year over 1,000 Population-Equivalents and that a potential income would add 21% to the annual profit ($194,900) from clam sales. So placing a price on environmental restoration can be possible (Camille &amp; Joao, et al., 2014).\u00a0How do I represent symbolically for humans in the 21<sup>st<\/sup> Century about a <em>Venerupis philippinarum<\/em> (Manila Clam).I express my feelings symbolically out loud by saying \u201cHAPPY AS A CLAM\u201d. When you look at a clam they always have a smile on their shell and they seem to be patient and tender.\u00a0<\/p>\n<p>&nbsp;<\/p>\n<p>Literature Cited:<\/p>\n<p>Holland DA, Chew KK (1974) Reproductive cycle of the Japanese littleneck Clam (Venerupis japonica) from Hood Canal, Washington). Proceedings of the National Shellfish Association 64: 53:58<\/p>\n<p>Yap WG (1977) Population biology of the Japanese littleneck clam, Tapes philippinarum, in Kaneoche Bay, Oahu, Hawaiian Islands. Pacific Science 31(3): 223:244<\/p>\n<p>Robyn Shean (2011) Venerupis philippinarum, Japanese littleneck clam. FISH 423: Aquatic Invasion Ecology, Fall 2011<\/p>\n<p>Camille Saurel , Jo\u00e3o G. Ferreira, Dan Cheney , Andy Suhrbier, Bill Dewey, Jonathan Davis, Jeff Cordell (2014), Ecosystem goods and services from Manila clam culture in Puget Sound: a modelling analysis, Aquaculture Environment Interactions Vol. 5: 255\u2013270, 2014<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; Common names: Japanese littleneck clam, manila clam, steamer clam Author: Justin Roberts<\/p>\n","protected":false},"author":3188,"featured_media":1320,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false},"categories":[24,4],"tags":[],"_links":{"self":[{"href":"https:\/\/sites.evergreen.edu\/vms-spring\/wp-json\/wp\/v2\/posts\/146"}],"collection":[{"href":"https:\/\/sites.evergreen.edu\/vms-spring\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/sites.evergreen.edu\/vms-spring\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/sites.evergreen.edu\/vms-spring\/wp-json\/wp\/v2\/users\/3188"}],"replies":[{"embeddable":true,"href":"https:\/\/sites.evergreen.edu\/vms-spring\/wp-json\/wp\/v2\/comments?post=146"}],"version-history":[{"count":0,"href":"https:\/\/sites.evergreen.edu\/vms-spring\/wp-json\/wp\/v2\/posts\/146\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/sites.evergreen.edu\/vms-spring\/wp-json\/wp\/v2\/media\/1320"}],"wp:attachment":[{"href":"https:\/\/sites.evergreen.edu\/vms-spring\/wp-json\/wp\/v2\/media?parent=146"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/sites.evergreen.edu\/vms-spring\/wp-json\/wp\/v2\/categories?post=146"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/sites.evergreen.edu\/vms-spring\/wp-json\/wp\/v2\/tags?post=146"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}