Larva surge is limited by marines/xenos ratio

code/modules/cm_aliens/structures/special/pylon_core.dm

@@ -148,12 +148,17 @@
 			if(players_with_xeno_pref && players_with_xeno_pref.len && can_spawn_larva())
 				spawn_burrowed_larva(pick(players_with_xeno_pref))
 
-		if(linked_hive.hijack_burrowed_surge && (last_surge_time + surge_cooldown) < world.time)
+		if(linked_hive.hijack_burrowed_surge && linked_hive.hijack_burrowed_left > 0 && (last_surge_time + surge_cooldown) < world.time)
 			last_surge_time = world.time
 			linked_hive.stored_larva++
+			linked_hive.hijack_burrowed_left--
 			announce_dchat("The hive has gained another burrowed larva! Use the Join As Xeno verb to take it.", src)
 			if(surge_cooldown > 30 SECONDS) //mostly for sanity purposes
 				surge_cooldown = surge_cooldown - surge_incremental_reduction //ramps up over time
+		if(linked_hive.hijack_burrowed_surge && linked_hive.hijack_burrowed_left == 0)
+			linked_hive.hijack_burrowed_surge = FALSE
+			xeno_message(SPAN_XENOANNOUNCE("Hive surge is fading away. You will no longer gain burrowed larva over time."), 3, linked_hive.hivenumber)
+
 
 	// Hive core can repair itself over time
 	if(health < maxhealth && last_healed <= world.time)

code/modules/mob/living/carbon/xenomorph/xeno_defines.dm

@@ -285,6 +285,7 @@
 	var/larva_gestation_multiplier = 1
 	var/bonus_larva_spawn_chance = 1
 	var/hijack_burrowed_surge = FALSE //at hijack, start spawning lots of burrowed
+	var/hijack_burrowed_left = 0 //how many burrowed is going to spawn during larva surge
 
 	var/ignore_slots = FALSE
 	var/dynamic_evolution = TRUE
@@ -907,7 +908,21 @@
 		for(var/obj/item/alien_embryo/embryo in potential_host)
 			embryo.hivenumber = XENO_HIVE_FORSAKEN
 		potential_host.update_med_icon()
+	var/shipside_humans_count = 0
+	var/xenos_count = 0
+	for(var/mob/living/carbon/human/current_human as anything in GLOB.alive_human_list)
+		if(isspecieshuman(current_human) || isspeciessynth(current_human))
+			var/atom/where = current_human
+			if (where.z == 0 && current_human.loc)
+				where = current_human.loc
+			if(is_mainship_level(where.z))
+				shipside_humans_count++
+	for(var/mob/living/carbon/xenomorph as anything in totalXenos)
+		if(isfacehugger(xenomorph))
+			continue
+		xenos_count++
 	hijack_burrowed_surge = TRUE
+	hijack_burrowed_left = max(n_ceil((shipside_humans_count - xenos_count) / 5), 1)
 	hivecore_cooldown = FALSE
 	xeno_message(SPAN_XENOBOLDNOTICE("The weeds have recovered! A new hive core can be built!"),3,hivenumber)